MICARDIS PLUS Telmisartan / Hydrochlorothiazide 40mg / 12.5mg Tablet 1's
RXDRUG-DRP-7622-1pc
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| CODE | Dosage Strength | Drug Packaging | Availability | Price | ||
|---|---|---|---|---|---|---|
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RXDRUG-DRP-7622-1pc
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In stock
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₱2550 |
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Features
Brand
Micardis Plus
Full Details
Dosage Strength
40 mg / 12.5 mg
Drug Ingredients
- Hydrochlorothiazide
- Telmisartan
Drug Packaging
Tablet 1's
Generic Name
Telmisartan / Hydrochlorothiazide
Dosage Form
Tablet
Registration Number
DRP-7622
Drug Classification
Prescription Drug (RX)
Description
Indications/Uses
Treatment of essential hypertension.
As fixed dose combination Telmisartan + HCTZ (Micardis Plus) is indicated in patients whose blood pressure is not adequately controlled on telmisartan or hydrochlorothiazide alone.
As fixed dose combination Telmisartan + HCTZ (Micardis Plus) is indicated in patients whose blood pressure is not adequately controlled on telmisartan or hydrochlorothiazide alone.
Dosage/Direction for Use
Adults: Telmisartan + HCTZ (Micardis Plus) should be taken once daily. The dose of telmisartan could be up-titrated before switching to Telmisartan + HCTZ (Micardis Plus). Direct change from monotherapy to the fixed combinations may be considered.
Telmisartan + HCTZ (Micardis Plus) 40/12.5 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan (Micardis) 40 mg or hydrochlorothiazide.
Telmisartan + HCTZ (Micardis Plus) 80/12.5 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan (Micardis) 80 mg or by Telmisartan + HCTZ (Micardis Plus) 40/12.5 mg.
Telmisartan + HCTZ (Micardis Plus) 80/25 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan + HCTZ (Micardis Plus) 80/12.5 mg or patients who have been previously stabilised on telmisartan and hydrochlorothiazide given separately.
Sodium or volume depletion should be corrected before treatment commencement with Telmisartan + HCTZ (Micardis Plus).
The maximum antihypertensive effect is generally attained with Telmisartan + HCTZ (Micardis Plus) 4 to 8 weeks after the start of treatment.
When necessary, Telmisartan + HCTZ (Micardis Plus) may be administered with another antihypertensive drug.
In patients with severe hypertension treatment with telmisartan at doses up to 160 mg alone and in combination with hydrochlorothiazide 12.5-25 mg daily was well tolerated and effective.
Special Populations: Geriatric patients: No dose adjustment is necessary for geriatric patients.
Paediatric patients: Safety and efficacy of Telmisartan + HCTZ (Micardis Plus) have not been established in patients aged below 18 years. Use of Telmisartan + HCTZ (Micardis Plus) is not recommended in children and adolescents.
Renal impairment: Due to the hydrochlorothiazide component, Telmisartan + HCTZ (Micardis Plus) must not be used in patients with severe renal dysfunction (creatinine clearance <30 mL/min). Loop diuretics are preferred to thiazides in this population. Experience in patients with mild to moderate renal impairment is modest but has not suggested adverse renal effects and dose adjustment is not considered necessary. Periodic monitoring of renal function is advised.
Telmisartan is not removed from blood by hemofiltration and is not dialyzable.
Hepatic impairment: In patients with mild to moderate hepatic impairment Telmisartan + HCTZ (Micardis Plus) should be administered with caution. For Telmisartan, the posology should not exceed once daily (see Contraindications). Thiazides should be used with caution in patients with impaired hepatic function.
Method of Administration: Telmisartan + HCTZ (Micardis Plus) tablets are for once-daily oral administration and should be swallowed whole with liquid. Telmisartan + HTCZ (Micardis Plus) can be taken with or without food.
Telmisartan + HCTZ (Micardis Plus) 40/12.5 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan (Micardis) 40 mg or hydrochlorothiazide.
Telmisartan + HCTZ (Micardis Plus) 80/12.5 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan (Micardis) 80 mg or by Telmisartan + HCTZ (Micardis Plus) 40/12.5 mg.
Telmisartan + HCTZ (Micardis Plus) 80/25 mg may be administered in patients whose blood pressure is not adequately controlled by Telmisartan + HCTZ (Micardis Plus) 80/12.5 mg or patients who have been previously stabilised on telmisartan and hydrochlorothiazide given separately.
Sodium or volume depletion should be corrected before treatment commencement with Telmisartan + HCTZ (Micardis Plus).
The maximum antihypertensive effect is generally attained with Telmisartan + HCTZ (Micardis Plus) 4 to 8 weeks after the start of treatment.
When necessary, Telmisartan + HCTZ (Micardis Plus) may be administered with another antihypertensive drug.
In patients with severe hypertension treatment with telmisartan at doses up to 160 mg alone and in combination with hydrochlorothiazide 12.5-25 mg daily was well tolerated and effective.
Special Populations: Geriatric patients: No dose adjustment is necessary for geriatric patients.
Paediatric patients: Safety and efficacy of Telmisartan + HCTZ (Micardis Plus) have not been established in patients aged below 18 years. Use of Telmisartan + HCTZ (Micardis Plus) is not recommended in children and adolescents.
Renal impairment: Due to the hydrochlorothiazide component, Telmisartan + HCTZ (Micardis Plus) must not be used in patients with severe renal dysfunction (creatinine clearance <30 mL/min). Loop diuretics are preferred to thiazides in this population. Experience in patients with mild to moderate renal impairment is modest but has not suggested adverse renal effects and dose adjustment is not considered necessary. Periodic monitoring of renal function is advised.
Telmisartan is not removed from blood by hemofiltration and is not dialyzable.
Hepatic impairment: In patients with mild to moderate hepatic impairment Telmisartan + HCTZ (Micardis Plus) should be administered with caution. For Telmisartan, the posology should not exceed once daily (see Contraindications). Thiazides should be used with caution in patients with impaired hepatic function.
Method of Administration: Telmisartan + HCTZ (Micardis Plus) tablets are for once-daily oral administration and should be swallowed whole with liquid. Telmisartan + HTCZ (Micardis Plus) can be taken with or without food.
Overdosage
Limited information is available for Telmisartan + HCTZ (Micardis Plus) with regard to overdose in humans.
Symptoms: The most prominent manifestations of telmisartan overdose were hypotension and tachycardia; bradycardia also occurred.
Overdose with hydrochlorothiazide is associated with electrolyte depletion (hypokalaemia, hypochloraemia) and dehydration resulting from excessive diuresis. The most common signs and symptoms of overdose are nausea and somnolence. Hypokalaemia may result in muscle spasm and/or accentuate cardiac arrhythmias associated with the concomitant use of digitalis glycosides or certain anti-arrhythmic drugs.
Therapy: No specific information is available on the treatment of overdose with Telmisartan + HCTZ (Micardis Plus). The patient should be closely monitored, and the treatment should be symptomatic and supportive depending on the time since ingestion and the severity of the symptoms. Serum electrolytes and creatinine should be monitored frequently. If hypotension occurs, the patient should be placed in a supine position, with salt and volume replacements given quickly.
Telmisartan is not removed by haemofiltration and is not dialyzable. The degree to which hydrochlorothiazide is removed by haemodialysis has not been established.
Symptoms: The most prominent manifestations of telmisartan overdose were hypotension and tachycardia; bradycardia also occurred.
Overdose with hydrochlorothiazide is associated with electrolyte depletion (hypokalaemia, hypochloraemia) and dehydration resulting from excessive diuresis. The most common signs and symptoms of overdose are nausea and somnolence. Hypokalaemia may result in muscle spasm and/or accentuate cardiac arrhythmias associated with the concomitant use of digitalis glycosides or certain anti-arrhythmic drugs.
Therapy: No specific information is available on the treatment of overdose with Telmisartan + HCTZ (Micardis Plus). The patient should be closely monitored, and the treatment should be symptomatic and supportive depending on the time since ingestion and the severity of the symptoms. Serum electrolytes and creatinine should be monitored frequently. If hypotension occurs, the patient should be placed in a supine position, with salt and volume replacements given quickly.
Telmisartan is not removed by haemofiltration and is not dialyzable. The degree to which hydrochlorothiazide is removed by haemodialysis has not been established.
Administration
May be taken with or without food.
Contraindications
Hypersensitivity to the active substances or to any of the excipients, or to other sulphonamide-derived substances (hydrochlorothiazide is a sulphonamide-derived substance); Pregnancy; Lactation; Cholestasis and biliary obstructive disorders; Severe hepatic impairment, coma hepatricum, hepatic precoma; Severe renal impairment (creatinine clearance <30 mL/min or serum creatinine >1.8 mg/100 mL), anuria, or acute glomerulonephritis; Refractory hypokalaemia, hypercalcaemia; Therapy-refractory hyponatraemia; Hypovolaemia; Symptomatic hyperuricaemia/gout; The concomitant use of Telmisartan + HCTZ (Micardis Plus) with aliskiren is contraindicated in patients with diabetes mellitus or renal impairment (GFR <60 mL/min/1.73 m2).
In case of rare hereditary conditions that may be incompatible with an excipient of the product, the use of the product is contraindicated.
In case of rare hereditary conditions that may be incompatible with an excipient of the product, the use of the product is contraindicated.
Special Precautions
Volume and/or sodium depleted patients: Symptomatic hypotension, especially after the first dose, may occur in patients who are volume and/or sodium depleted by vigorous diuretic therapy, dietary salt restriction, diarrhoea or vomiting. Such conditions, especially volume and/or sodium depletion, should be corrected before the administration of Telmisartan + HCTZ (Micardis Plus).
Hepatic impairment: Telmisartan + HCTZ (Micardis Plus) must not be given to patients with cholestasis, biliary obstructive disorders or severe hepatic insufficiency since telmisartan is mostly eliminated in the bile. These patients can be expected to have reduced hepatic clearance for telmisartan.
Telmisartan + HCTZ (Micardis Plus) should be used with caution in patients with impaired hepatic function or progressive liver disease, since minor alterations of fluid and electrolyte balance may precipitate hepatic coma. There is no clinical experience with Telmisartan + HCTZ (Micardis Plus) in patients with hepatic impairment.
Renovascular hypertension: There is an increased risk of severe hypotension and renal insufficiency when patients with bilateral renal artery stenosis or stenosis of the artery to a single functioning kidney are treated with medicinal products that affect the renin-angiotensin-aldosterone system.
Renal impairment and kidney transplant: Telmisartan + HCTZ (Micardis Plus) must not be used in patients with severe renal impairment (creatinine clearance <30 mL/min) (see Contraindications).
There is no experience regarding the administration of Telmisartan + HCTZ (Micardis Plus) in patients with severe renal impairment or with a recent kidney transplant. Experience with Telmisartan + HCTZ (Micardis Plus) is modest in the patients with mild to moderate renal impairment, therefore periodic monitoring of potassium, creatinine and uric acid serum levels is recommended. Thiazide diuretic-associated azotaemia may occur in patients with impaired renal function.
Telmisartan is not removed from blood by hemofiltration and is not dialyzable.
Dual blockade of the renin-angiotensin-aldosterone system: As a consequence of inhibiting the renin-angiotensin-aldosterone system changes in renal function (including acute renal failure) have been reported in susceptible individuals, especially if combining medicinal products that affect this system. Dual blockade of the renin-angiotensin-aldosterone system (e.g. by adding an ACE-inhibitor or the direct renin-inhibitor aliskiren to an angiotensin II receptor blocker) is not recommended and should therefore be limited to individually defined cases with close monitoring of renal function (see Contraindications).
Other conditions with stimulation of the renin-angiotensin-aldosterone system: In patients whose vascular tone and renal function depend predominantly on the activity of the renin-angiotensin-aldosterone system (e.g. patients with severe congestive heart failure or underlying renal disease, including renal artery stenosis), treatment with other medicinal products that affect this system has been associated with acute hypotension, hyperazotaemia, oliguria, or rarely acute renal failure.
Primary aldosteronism: Patients with primary aldosteronism generally will not respond to antihypertensive medicinal products acting through inhibition of the renin-angiotensin system. Therefore, the use of Telmisartan + HCTZ (Micardis Plus) is not recommended.
Aortic and mitral valve stenosis, obstructive hypertrophic cardiomyopathy: As with other vasodilators, special caution is indicated in patients suffering from aortic or mitral stenosis, or obstructive hypertrophic cardiomyopathy.
Metabolic and endocrine effects: Thiazide therapy may impair glucose tolerance. In diabetic patients dosage adjustments of insulin or oral hypoglycaemic agents may be required. Latent diabetes mellitus may become manifest during thiazide therapy.
An increase in cholesterol and triglyceride levels has been associated with thiazide diuretic therapy; however, at the 12.5 mg dose contained in Telmisartan + HCTZ (Micardis Plus), minimal or no effects were reported.
Hyperuricaemia may occur or frank gout may be precipitated in some patients receiving thiazide therapy.
Electrolyte imbalance: As for any patient receiving diuretic therapy, periodic determination of serum electrolytes should be performed at appropriate intervals.
Thiazides, including hydrochlorothiazide, can cause fluid or electrolyte imbalance (hypokalaemia, hyponatraemia, and hypochloraemic alkalosis). Warning signs of fluid or electrolyte imbalance are dryness of mouth, thirst, weakness, lethargy, drowsiness, restlessness, muscle pain or cramps, muscular fatigue, hypotension, oliguria, tachycardia, and gastro-intestinal disturbances such as nausea or vomiting.
Although hypokalaemia may develop with the use of thiazide diuretics, concurrent therapy with telmisartan may reduce diuretic-induced hypokalaemia. The risk of hypokalaemia is greatest in patients with cirrhosis of liver, in patients experiencing brisk diuresis, in patients who are receiving inadequate oral intake of electrolytes and in patients receiving concomitant therapy with corticosteroids or ACTH. Conversely, due to the antagonism of the angiotensin II (AT1) receptors by the telmisartan component of Telmisartan + HCTZ (Micardis Plus), hyperkalaemia might occur.
Although clinically significant hyperkalaemia has not been documented with Telmisartan + HCTZ (Micardis Plus), risk factors for the development of hyperkalaemia include renal insufficiency and/or heart failure, and diabetes mellitus. Potassium-sparing diuretics, potassium supplements or potassium-containing salt substitutes should be co-administered cautiously with Telmisartan + HCTZ (Micardis Plus).
Thiazides may decrease urinary calcium excretion and cause an intermittent and slight elevation of serum calcium in the absence of known disorders of calcium metabolism. Marked hypercalcaemia may be evidence of hidden hyperparathyroidism. Thiazides should be discontinued before carrying out tests for parathyroid function.
Thiazides have been shown to increase the urinary excretion of magnesium, which may result in hypomagnesaemia.
Sodium: Telmisartan + HCTZ (Micardis Plus), tablets 40/12.5 mg, 80/12.5 mg and 80/25 mg contain less than 1 mmol sodium (23 mg) per tablet, that is to say essentially 'sodium-free'.
Sorbitol: Telmisartan + HCTZ (Micardis Plus) tablets 40/12.5 mg contains 169 mg sorbitol in each tablet.
Telmisartan + HCTZ (Micardis Plus) tablets 80/12.5 mg and 80/25 mg contain 338 mg sorbitol in each tablet.
Sorbitol is a source of fructose. Telmisartan + HCTZ (Micardis Plus) tablets 80/12.5 mg and 80/25 mg are not recommended for use in patients with hereditary fructose intolerance (HFI).
Lactose: Telmisartan + HCTZ (Micardis Plus) tablets 40/12.5 mg and 80/12.5 mg contain 112 mg of lactose monohydrate in each tablet.
Telmisartan + HCTZ (Micardis Plus) tablet 80/25 mg contains 99 mg of lactose monohydrate in each tablet.
Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take this medicine.
Diabetes mellitus: In diabetic patients with an additional cardiovascular risk, i.e. patients with diabetes mellitus and coexistent coronary artery disease (CAD), the risk of fatal myocardial infarction and unexpected cardiovascular death may be increased when treated with blood pressure lowering agents such as ARBs or ACE-inhibitors. In patients with diabetes mellitus CAD may be asymptomatic and therefore undiagnosed. Patients with diabetes mellitus should undergo appropriate diagnostic evaluation, e.g. exercise stress testing, to detect and to treat CAD accordingly before initiating treatment with Telmisartan + HCTZ (Micardis Plus).
Ischaemic heart disease: As with any antihypertensive agent, excessive reduction of blood pressure in patients with ischaemic cardiopathy or ischaemic cardiovascular disease could result in a myocardial infarction or stroke.
General: Hypersensitivity reactions to hydrochlorothiazide may occur in patients with or without a history of allergy or bronchial asthma, but are more likely in patients with such a history.
Exacerbation or activation of systemic lupus erythematosus has been reported with the use of thiazide diuretics.
Choroidal effusion, Acute Myopia and Secondary Angle-Closure Glaucoma: Hydrochlorothiazide, a sulfonamide, can cause an idiosyncratic reaction, resulting in choroidal effusion with visual field defect, in acute transient myopia and acute angle-closure glaucoma. Symptoms include acute onset of decreased visual acuity or ocular pain and typically occur within hours to weeks of drug initiation. Untreated acute angle-closure glaucoma can lead to permanent vision loss. The primary treatment is to discontinue hydrochlorothiazide as rapidly as possible. Prompt medical or surgical treatments may need to be considered if the intraocular pressure remains uncontrolled. Risk factors for developing acute angle-closure glaucoma may include a history of sulfonamide or penicillin allergy.
Non-melanoma skin cancer: An increased risk of non-melanoma skin cancer (NMSC) [basal cell carcinoma (BCC) and squamous cell carcinoma (SCC)] with increasing cumulative dose of hydrochlorothiazide exposure has been observed in two epidemiological studies based on the Danish National Cancer Registry (see Adverse Reactions). Photosensitizing actions of hydrochlorothiazide could act as a possible mechanism for NMSC.
Patients taking hydrochlorothiazide should be informed of the risk of NMSC and advised to regularly check their skin for any new lesions and promptly report any suspicious skin lesions. Suspicious skin lesions should be promptly examined potentially including histological examinations of biopsies.
Possible preventive measures such as limited exposure to sunlight and UV rays and, in case of exposure, adequate protection should be advised to the patients in order to minimize the risk of skin cancer. The use of hydrochlorothiazide may also need to be reconsidered in patients who have experienced previous NMSC.
Driving and using machines: No studies on the effect on the ability to drive and use machines have been performed. However, when driving vehicles or operating machinery, it should be taken into account that dizziness, syncope or vertigo may occasionally occur when taking antihypertensive therapy.
If patients experience these adverse events, they should avoid potentially hazardous tasks such as driving or operating machinery.
Use in Pregnancy: Angiotensin II receptor blockers should not be initiated during pregnancy.
Unless continued angiotensin II receptor blocker therapy is considered essential, patients planning pregnancy should be changed to alternative anti-hypertensive treatments which have an established safety profile for use in pregnancy.
When pregnancy is diagnosed, treatment with angiotensin II receptor blockers should be stopped immediately, and if appropriate, alternative therapy should be started.
Hepatic impairment: Telmisartan + HCTZ (Micardis Plus) must not be given to patients with cholestasis, biliary obstructive disorders or severe hepatic insufficiency since telmisartan is mostly eliminated in the bile. These patients can be expected to have reduced hepatic clearance for telmisartan.
Telmisartan + HCTZ (Micardis Plus) should be used with caution in patients with impaired hepatic function or progressive liver disease, since minor alterations of fluid and electrolyte balance may precipitate hepatic coma. There is no clinical experience with Telmisartan + HCTZ (Micardis Plus) in patients with hepatic impairment.
Renovascular hypertension: There is an increased risk of severe hypotension and renal insufficiency when patients with bilateral renal artery stenosis or stenosis of the artery to a single functioning kidney are treated with medicinal products that affect the renin-angiotensin-aldosterone system.
Renal impairment and kidney transplant: Telmisartan + HCTZ (Micardis Plus) must not be used in patients with severe renal impairment (creatinine clearance <30 mL/min) (see Contraindications).
There is no experience regarding the administration of Telmisartan + HCTZ (Micardis Plus) in patients with severe renal impairment or with a recent kidney transplant. Experience with Telmisartan + HCTZ (Micardis Plus) is modest in the patients with mild to moderate renal impairment, therefore periodic monitoring of potassium, creatinine and uric acid serum levels is recommended. Thiazide diuretic-associated azotaemia may occur in patients with impaired renal function.
Telmisartan is not removed from blood by hemofiltration and is not dialyzable.
Dual blockade of the renin-angiotensin-aldosterone system: As a consequence of inhibiting the renin-angiotensin-aldosterone system changes in renal function (including acute renal failure) have been reported in susceptible individuals, especially if combining medicinal products that affect this system. Dual blockade of the renin-angiotensin-aldosterone system (e.g. by adding an ACE-inhibitor or the direct renin-inhibitor aliskiren to an angiotensin II receptor blocker) is not recommended and should therefore be limited to individually defined cases with close monitoring of renal function (see Contraindications).
Other conditions with stimulation of the renin-angiotensin-aldosterone system: In patients whose vascular tone and renal function depend predominantly on the activity of the renin-angiotensin-aldosterone system (e.g. patients with severe congestive heart failure or underlying renal disease, including renal artery stenosis), treatment with other medicinal products that affect this system has been associated with acute hypotension, hyperazotaemia, oliguria, or rarely acute renal failure.
Primary aldosteronism: Patients with primary aldosteronism generally will not respond to antihypertensive medicinal products acting through inhibition of the renin-angiotensin system. Therefore, the use of Telmisartan + HCTZ (Micardis Plus) is not recommended.
Aortic and mitral valve stenosis, obstructive hypertrophic cardiomyopathy: As with other vasodilators, special caution is indicated in patients suffering from aortic or mitral stenosis, or obstructive hypertrophic cardiomyopathy.
Metabolic and endocrine effects: Thiazide therapy may impair glucose tolerance. In diabetic patients dosage adjustments of insulin or oral hypoglycaemic agents may be required. Latent diabetes mellitus may become manifest during thiazide therapy.
An increase in cholesterol and triglyceride levels has been associated with thiazide diuretic therapy; however, at the 12.5 mg dose contained in Telmisartan + HCTZ (Micardis Plus), minimal or no effects were reported.
Hyperuricaemia may occur or frank gout may be precipitated in some patients receiving thiazide therapy.
Electrolyte imbalance: As for any patient receiving diuretic therapy, periodic determination of serum electrolytes should be performed at appropriate intervals.
Thiazides, including hydrochlorothiazide, can cause fluid or electrolyte imbalance (hypokalaemia, hyponatraemia, and hypochloraemic alkalosis). Warning signs of fluid or electrolyte imbalance are dryness of mouth, thirst, weakness, lethargy, drowsiness, restlessness, muscle pain or cramps, muscular fatigue, hypotension, oliguria, tachycardia, and gastro-intestinal disturbances such as nausea or vomiting.
Although hypokalaemia may develop with the use of thiazide diuretics, concurrent therapy with telmisartan may reduce diuretic-induced hypokalaemia. The risk of hypokalaemia is greatest in patients with cirrhosis of liver, in patients experiencing brisk diuresis, in patients who are receiving inadequate oral intake of electrolytes and in patients receiving concomitant therapy with corticosteroids or ACTH. Conversely, due to the antagonism of the angiotensin II (AT1) receptors by the telmisartan component of Telmisartan + HCTZ (Micardis Plus), hyperkalaemia might occur.
Although clinically significant hyperkalaemia has not been documented with Telmisartan + HCTZ (Micardis Plus), risk factors for the development of hyperkalaemia include renal insufficiency and/or heart failure, and diabetes mellitus. Potassium-sparing diuretics, potassium supplements or potassium-containing salt substitutes should be co-administered cautiously with Telmisartan + HCTZ (Micardis Plus).
Thiazides may decrease urinary calcium excretion and cause an intermittent and slight elevation of serum calcium in the absence of known disorders of calcium metabolism. Marked hypercalcaemia may be evidence of hidden hyperparathyroidism. Thiazides should be discontinued before carrying out tests for parathyroid function.
Thiazides have been shown to increase the urinary excretion of magnesium, which may result in hypomagnesaemia.
Sodium: Telmisartan + HCTZ (Micardis Plus), tablets 40/12.5 mg, 80/12.5 mg and 80/25 mg contain less than 1 mmol sodium (23 mg) per tablet, that is to say essentially 'sodium-free'.
Sorbitol: Telmisartan + HCTZ (Micardis Plus) tablets 40/12.5 mg contains 169 mg sorbitol in each tablet.
Telmisartan + HCTZ (Micardis Plus) tablets 80/12.5 mg and 80/25 mg contain 338 mg sorbitol in each tablet.
Sorbitol is a source of fructose. Telmisartan + HCTZ (Micardis Plus) tablets 80/12.5 mg and 80/25 mg are not recommended for use in patients with hereditary fructose intolerance (HFI).
Lactose: Telmisartan + HCTZ (Micardis Plus) tablets 40/12.5 mg and 80/12.5 mg contain 112 mg of lactose monohydrate in each tablet.
Telmisartan + HCTZ (Micardis Plus) tablet 80/25 mg contains 99 mg of lactose monohydrate in each tablet.
Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take this medicine.
Diabetes mellitus: In diabetic patients with an additional cardiovascular risk, i.e. patients with diabetes mellitus and coexistent coronary artery disease (CAD), the risk of fatal myocardial infarction and unexpected cardiovascular death may be increased when treated with blood pressure lowering agents such as ARBs or ACE-inhibitors. In patients with diabetes mellitus CAD may be asymptomatic and therefore undiagnosed. Patients with diabetes mellitus should undergo appropriate diagnostic evaluation, e.g. exercise stress testing, to detect and to treat CAD accordingly before initiating treatment with Telmisartan + HCTZ (Micardis Plus).
Ischaemic heart disease: As with any antihypertensive agent, excessive reduction of blood pressure in patients with ischaemic cardiopathy or ischaemic cardiovascular disease could result in a myocardial infarction or stroke.
General: Hypersensitivity reactions to hydrochlorothiazide may occur in patients with or without a history of allergy or bronchial asthma, but are more likely in patients with such a history.
Exacerbation or activation of systemic lupus erythematosus has been reported with the use of thiazide diuretics.
Choroidal effusion, Acute Myopia and Secondary Angle-Closure Glaucoma: Hydrochlorothiazide, a sulfonamide, can cause an idiosyncratic reaction, resulting in choroidal effusion with visual field defect, in acute transient myopia and acute angle-closure glaucoma. Symptoms include acute onset of decreased visual acuity or ocular pain and typically occur within hours to weeks of drug initiation. Untreated acute angle-closure glaucoma can lead to permanent vision loss. The primary treatment is to discontinue hydrochlorothiazide as rapidly as possible. Prompt medical or surgical treatments may need to be considered if the intraocular pressure remains uncontrolled. Risk factors for developing acute angle-closure glaucoma may include a history of sulfonamide or penicillin allergy.
Non-melanoma skin cancer: An increased risk of non-melanoma skin cancer (NMSC) [basal cell carcinoma (BCC) and squamous cell carcinoma (SCC)] with increasing cumulative dose of hydrochlorothiazide exposure has been observed in two epidemiological studies based on the Danish National Cancer Registry (see Adverse Reactions). Photosensitizing actions of hydrochlorothiazide could act as a possible mechanism for NMSC.
Patients taking hydrochlorothiazide should be informed of the risk of NMSC and advised to regularly check their skin for any new lesions and promptly report any suspicious skin lesions. Suspicious skin lesions should be promptly examined potentially including histological examinations of biopsies.
Possible preventive measures such as limited exposure to sunlight and UV rays and, in case of exposure, adequate protection should be advised to the patients in order to minimize the risk of skin cancer. The use of hydrochlorothiazide may also need to be reconsidered in patients who have experienced previous NMSC.
Driving and using machines: No studies on the effect on the ability to drive and use machines have been performed. However, when driving vehicles or operating machinery, it should be taken into account that dizziness, syncope or vertigo may occasionally occur when taking antihypertensive therapy.
If patients experience these adverse events, they should avoid potentially hazardous tasks such as driving or operating machinery.
Use in Pregnancy: Angiotensin II receptor blockers should not be initiated during pregnancy.
Unless continued angiotensin II receptor blocker therapy is considered essential, patients planning pregnancy should be changed to alternative anti-hypertensive treatments which have an established safety profile for use in pregnancy.
When pregnancy is diagnosed, treatment with angiotensin II receptor blockers should be stopped immediately, and if appropriate, alternative therapy should be started.
Use In Pregnancy & Lactation
Pregnancy: Telmisartan: The use of angiotensin II receptor blockers is not recommended during the first trimester of pregnancy and should not be initiated during pregnancy. When pregnancy is diagnosed, treatment with angiotensin II receptor blockers should be stopped immediately, and, if appropriate, alternative therapy should be started.
Unless continued angiotensin II receptor blocker therapy is considered essential, patients planning pregnancy should be changed to alternative anti-hypertensive treatments which have an established safety profile for use in pregnancy.
The use of angiotensin II receptor blocker is contraindicated during the second and third trimester of pregnancy.
Angiotensin II receptor blockers exposure during the second and third trimesters is known to induce human fetotoxicity (decreased renal function, oligohydramnios, skull ossification retardation) and neonatal toxicity (renal failure, hypotension, hyperkalaemia).
Should exposure to angiotensin II receptor blockers have occurred from the second trimester of pregnancy, ultrasound check of renal function and skull is recommended.
Infants whose mothers have taken angiotensin II receptor blockers should be closely observed for hypotension.
Hydrochlorothiazide: There is limited experience with hydrochlorothiazide during pregnancy, especially during the first trimester.
Hydrochlorothiazide crosses the placenta. Based on the pharmacological mechanism of action of hydrochlorothiazide its use during the second and third trimester may compromise foeto-placental perfusion and may cause foetal and neonatal effects like icterus, disturbance of electrolyte balance and thrombocytopenia.
Hydrochlorothiazide should not be used for gestational oedema, gestational hypertension or preeclampsia due to the risk of decreased plasma volume and placental hypoperfusion, without a beneficial effect on the course of the disease.
Hydrochlorothiazide should not be used for essential hypertension in pregnant women except in rare situations where no other treatment could be used.
Lactation: Telmisartan + HCTZ (Micardis Plus) is contraindicated during lactation since it is not known whether telmisartan is excreted in human milk. Non-clinical studies have shown excretion of telmisartan in breast milk.
Thiazides appear in human milk and may inhibit lactation.
Fertility: No studies on fertility in humans with the fixed dose combination or with the individual components have been performed.
In non-clinical studies, no effects of telmisartan and hydrochlorothiazide on male and female fertility were observed.
Unless continued angiotensin II receptor blocker therapy is considered essential, patients planning pregnancy should be changed to alternative anti-hypertensive treatments which have an established safety profile for use in pregnancy.
The use of angiotensin II receptor blocker is contraindicated during the second and third trimester of pregnancy.
Angiotensin II receptor blockers exposure during the second and third trimesters is known to induce human fetotoxicity (decreased renal function, oligohydramnios, skull ossification retardation) and neonatal toxicity (renal failure, hypotension, hyperkalaemia).
Should exposure to angiotensin II receptor blockers have occurred from the second trimester of pregnancy, ultrasound check of renal function and skull is recommended.
Infants whose mothers have taken angiotensin II receptor blockers should be closely observed for hypotension.
Hydrochlorothiazide: There is limited experience with hydrochlorothiazide during pregnancy, especially during the first trimester.
Hydrochlorothiazide crosses the placenta. Based on the pharmacological mechanism of action of hydrochlorothiazide its use during the second and third trimester may compromise foeto-placental perfusion and may cause foetal and neonatal effects like icterus, disturbance of electrolyte balance and thrombocytopenia.
Hydrochlorothiazide should not be used for gestational oedema, gestational hypertension or preeclampsia due to the risk of decreased plasma volume and placental hypoperfusion, without a beneficial effect on the course of the disease.
Hydrochlorothiazide should not be used for essential hypertension in pregnant women except in rare situations where no other treatment could be used.
Lactation: Telmisartan + HCTZ (Micardis Plus) is contraindicated during lactation since it is not known whether telmisartan is excreted in human milk. Non-clinical studies have shown excretion of telmisartan in breast milk.
Thiazides appear in human milk and may inhibit lactation.
Fertility: No studies on fertility in humans with the fixed dose combination or with the individual components have been performed.
In non-clinical studies, no effects of telmisartan and hydrochlorothiazide on male and female fertility were observed.
Adverse Reactions
Summary of the safety profile: The overall incidence of adverse events reported with Telmisartan + HCTZ (Micardis Plus) was comparable to those reported with telmisartan alone in randomised controlled trials involving 1471 patients receiving telmisartan plus hydrochlorothiazide (835) or telmisartan alone (636). There was no dose-relationship to undesirable effects and there was no correlation with gender, age or race of the patients.
Tabulated summary of adverse reactions: The following adverse reactions derived from the use of telmisartan/ hydrochlorothiazide combination or the use of monocomponents telmisartan or hydrochlorothiazide in clinical trials or from post-marketing experience are shown in the table as follows classified by MedDRA System organ class and MedDRA Preferred Terms. (See Table A and B.)
Tabulated summary of adverse reactions: The following adverse reactions derived from the use of telmisartan/ hydrochlorothiazide combination or the use of monocomponents telmisartan or hydrochlorothiazide in clinical trials or from post-marketing experience are shown in the table as follows classified by MedDRA System organ class and MedDRA Preferred Terms. (See Table A and B.)
Drug Interactions
Interactions linked to telmisartan: Telmisartan may increase the hypotensive effect of other antihypertensive agents.
Co-administration of telmisartan did not result in a clinically significant interaction with digoxin, warfarin, hydrochlorothiazide, glibenclamide, ibuprofen, paracetamol, simvastatin and amlodipine. For digoxin a 20% increase in median plasma digoxin trough concentration has been observed (39% in a single case), monitoring of plasma digoxin levels should be considered.
In one study the co-administration of telmisartan and ramipril led to an increase of up to 2.5 fold in the AUC0-24 and Cmax of ramipril and ramiprilat. The clinical relevance of this observation is not known.
Reversible increases in serum lithium concentrations and toxicity have been reported during concomitant administration of lithium with angiotensin converting enzyme inhibitors.
Cases have also been reported with angiotensin II receptor blockers, including telmisartan. Furthermore, renal clearance of lithium is reduced by thiazides so the risk of lithium toxicity could be increased with Telmisartan + HCTZ (Micardis Plus). Lithium and Telmisartan + HCTZ (Micardis Plus) should only be co-administered under medical supervision and serum lithium level monitoring is advisable during concomitant use.
Treatment with NSAIDS (i.e. ASA at anti-inflammatory dosage regimens, COX-2 inhibitors and non-selective NSAIDs) is associated with the potential for acute renal insufficiency in patients who are dehydrated. Compounds acting on the Renin-Angiotensin-System like telmisartan may have synergistic effects. Patients receiving NSAIDs and telmisartan should be adequately hydrated and be monitored for renal function at the beginning of combined treatment.
A reduced effect of antihypertensive drugs like telmisartan by inhibition of vasodilating prostaglandins has been reported during combined treatment with NSAIDs.
The co-administration of NSAIDs may reduce the diuretic, natriuretic and antihypertensive effects of thiazide diuretics in some patients.
Interactions linked to hydrochlorothiazide (HCTZ): The antihypertensive effect of HCTZ can be potentiated by other diuretics, antihypertensive agents, guanethidine, methyldopa, calcium antagonists, ACE inhibitors, ARBs, DRIs, beta-receptor blockers, nitrates, barbiturates, phenothiazines, tricyclic antidepressants, vasodilators or by alcohol consumption.
Salicylates and other non-steroidal anti-inflammatory drugs (e.g. indomethacin) may reduce the antihypertensive and diuretic effect of HCTZ. In patients taking high-dose salicylates, the toxic effect of salicylates on the central nervous system may be potentiated. In patients developing hypovolaemia during treatment with HCTZ, concomitant administration of non-steroidal anti-inflammatory drugs may trigger acute renal failure.
Co-administration of thiazides (including hydrochlorothiazide) and allopurinol may possibly increase the frequency of hypersensitivity reactions to allopurinol.
Co-administration of thiazides and amantadine may possibly increase the risk of amantadine-related adverse reactions.
There is an increased risk for the onset of hyperglycaemia with concomitant administration of HCTZ and beta-receptor blockers.
The effect of insulin or oral antidiabetics, uric acid-lowering agents, as well as norepinephrine and epinephrine, may be attenuated with concomitant use of HCTZ. An adjustment of the insulin or oral antidiabetic dosage may therefore be required.
In concomitant treatment with cardiac glycosides, it must be remembered that myocardial sensitivity to cardiac glycosides will be increased by any hypokalaemia and/or hypomagnesaemia that develops during HCTZ therapy, thereby potentiating the effects and adverse effects of these cardiac glycosides.
Concomitant use of HCTZ and kaliuretic diuretics (e.g. furosemide), glucocorticoids, ACTH, carbenoxolone, penicillin G, salicylates, amphotericin B, antiarrhythmics or laxatives may lead to increased potassium loss.
Concomitant use of natriuretic diuretics and antidepressants, antipsychotics or antiepileptics may lead to increased sodium loss.
Concomitant use of thiazide diuretics and cytotoxic agents (e.g. cyclophosphamide, fluorouracil, methotrexate) may lead to a reduction in the renal excretion of cytotoxic agents. Increased bone marrow toxicity (especially granulocytopenia) can be expected.
The bioavailability of thiazide diuretics may be increased by anticholinergic agents (e.g. atropine, biperiden). This is probably due to a decrease in gastrointestinal motility and the gastric emptying rate. In contrast, prokinetic medicinal products such as cisapride may reduce the bioavailability of thiazide diuretics.
Diuretics increase plasma lithium levels. As concomitant administration of HCTZ and lithium leads to potentiation of the cardio- and neurotoxic effects of lithium due to decreased lithium excretion, the lithium level must be monitored in patients receiving HCTZ and lithium. In patients in whom lithium has induced polyuria, diuretics can have a paradoxical antidiuretic effect.
The effect of curare-like muscle relaxants may be potentiated or prolonged by HCTZ. In cases where HCTZ cannot be discontinued before the use of curare-like muscle relaxants, the anaesthetist must be informed of the treatment with HCTZ.
Concomitant use of cholestyramine or colestipol reduces the absorption of HCTZ. However, the interaction may possibly be minimized by staggered dosing of hydrochlorothiazide and the resinate, so that hydrochlorothiazide is taken at least 4 hours before or 4-6 hours after administration of the resinate.
Concomitant use with vitamin D may reduce the excretion of calcium via the urine and potentiate the increase of calcium in serum.
When co-administered with calcium salts, hypercalcaemia may occur due to the increase in tubular calcium reuptake.
Concomitant use with ciclosporin may increase the risk of hyperuricaemia and gout-like complications. Thiazides can increase the hyperglycaemic effect of diazoxide.
During concomitant use of methyldopa, there have been uncommon reports of haemolysis, caused by the formation of antibodies against hydrochlorothiazide.
Hydrochlorothiazide may reduce the response to adrenergic amines, such as norepinephrine.
The potassium-depleting effect of hydrochlorothiazide is attenuated by the potassium-sparing effect of telmisartan. However, this effect of hydrochlorothiazide on serum potassium would be expected to be potentiated by other drugs associated with potassium loss and hypokalaemia (e.g. other kaliuretic diuretics, laxatives, corticosteroids, ACTH, amphotericin, carbenoxolone, penicillin G sodium, salicylic acid and derivatives).
If these drugs are to be prescribed with Telmisartan + HCTZ (Micardis Plus), monitoring of potassium plasma levels is advised.
Conversely, based on the experience with the use of other drugs that blunt the renin-angiotensin system, concomitant use of potassium-sparing diuretics, potassium supplements, salt substitutes containing potassium or other drugs that may increase serum potassium levels (e.g. heparin sodium) may lead to increases in serum potassium.
If these drugs are to be prescribed with Telmisartan + HCTZ (Micardis Plus), monitoring of potassium plasma levels is advised.
Periodic monitoring of serum potassium is recommended when Telmisartan + HCTZ (Micardis Plus) is administered with drugs affected by serum potassium disturbances, e.g. digitalis glycosides, anti-arrhythmic agents and drugs known to induce torsades de pointes.
Co-administration of telmisartan did not result in a clinically significant interaction with digoxin, warfarin, hydrochlorothiazide, glibenclamide, ibuprofen, paracetamol, simvastatin and amlodipine. For digoxin a 20% increase in median plasma digoxin trough concentration has been observed (39% in a single case), monitoring of plasma digoxin levels should be considered.
In one study the co-administration of telmisartan and ramipril led to an increase of up to 2.5 fold in the AUC0-24 and Cmax of ramipril and ramiprilat. The clinical relevance of this observation is not known.
Reversible increases in serum lithium concentrations and toxicity have been reported during concomitant administration of lithium with angiotensin converting enzyme inhibitors.
Cases have also been reported with angiotensin II receptor blockers, including telmisartan. Furthermore, renal clearance of lithium is reduced by thiazides so the risk of lithium toxicity could be increased with Telmisartan + HCTZ (Micardis Plus). Lithium and Telmisartan + HCTZ (Micardis Plus) should only be co-administered under medical supervision and serum lithium level monitoring is advisable during concomitant use.
Treatment with NSAIDS (i.e. ASA at anti-inflammatory dosage regimens, COX-2 inhibitors and non-selective NSAIDs) is associated with the potential for acute renal insufficiency in patients who are dehydrated. Compounds acting on the Renin-Angiotensin-System like telmisartan may have synergistic effects. Patients receiving NSAIDs and telmisartan should be adequately hydrated and be monitored for renal function at the beginning of combined treatment.
A reduced effect of antihypertensive drugs like telmisartan by inhibition of vasodilating prostaglandins has been reported during combined treatment with NSAIDs.
The co-administration of NSAIDs may reduce the diuretic, natriuretic and antihypertensive effects of thiazide diuretics in some patients.
Interactions linked to hydrochlorothiazide (HCTZ): The antihypertensive effect of HCTZ can be potentiated by other diuretics, antihypertensive agents, guanethidine, methyldopa, calcium antagonists, ACE inhibitors, ARBs, DRIs, beta-receptor blockers, nitrates, barbiturates, phenothiazines, tricyclic antidepressants, vasodilators or by alcohol consumption.
Salicylates and other non-steroidal anti-inflammatory drugs (e.g. indomethacin) may reduce the antihypertensive and diuretic effect of HCTZ. In patients taking high-dose salicylates, the toxic effect of salicylates on the central nervous system may be potentiated. In patients developing hypovolaemia during treatment with HCTZ, concomitant administration of non-steroidal anti-inflammatory drugs may trigger acute renal failure.
Co-administration of thiazides (including hydrochlorothiazide) and allopurinol may possibly increase the frequency of hypersensitivity reactions to allopurinol.
Co-administration of thiazides and amantadine may possibly increase the risk of amantadine-related adverse reactions.
There is an increased risk for the onset of hyperglycaemia with concomitant administration of HCTZ and beta-receptor blockers.
The effect of insulin or oral antidiabetics, uric acid-lowering agents, as well as norepinephrine and epinephrine, may be attenuated with concomitant use of HCTZ. An adjustment of the insulin or oral antidiabetic dosage may therefore be required.
In concomitant treatment with cardiac glycosides, it must be remembered that myocardial sensitivity to cardiac glycosides will be increased by any hypokalaemia and/or hypomagnesaemia that develops during HCTZ therapy, thereby potentiating the effects and adverse effects of these cardiac glycosides.
Concomitant use of HCTZ and kaliuretic diuretics (e.g. furosemide), glucocorticoids, ACTH, carbenoxolone, penicillin G, salicylates, amphotericin B, antiarrhythmics or laxatives may lead to increased potassium loss.
Concomitant use of natriuretic diuretics and antidepressants, antipsychotics or antiepileptics may lead to increased sodium loss.
Concomitant use of thiazide diuretics and cytotoxic agents (e.g. cyclophosphamide, fluorouracil, methotrexate) may lead to a reduction in the renal excretion of cytotoxic agents. Increased bone marrow toxicity (especially granulocytopenia) can be expected.
The bioavailability of thiazide diuretics may be increased by anticholinergic agents (e.g. atropine, biperiden). This is probably due to a decrease in gastrointestinal motility and the gastric emptying rate. In contrast, prokinetic medicinal products such as cisapride may reduce the bioavailability of thiazide diuretics.
Diuretics increase plasma lithium levels. As concomitant administration of HCTZ and lithium leads to potentiation of the cardio- and neurotoxic effects of lithium due to decreased lithium excretion, the lithium level must be monitored in patients receiving HCTZ and lithium. In patients in whom lithium has induced polyuria, diuretics can have a paradoxical antidiuretic effect.
The effect of curare-like muscle relaxants may be potentiated or prolonged by HCTZ. In cases where HCTZ cannot be discontinued before the use of curare-like muscle relaxants, the anaesthetist must be informed of the treatment with HCTZ.
Concomitant use of cholestyramine or colestipol reduces the absorption of HCTZ. However, the interaction may possibly be minimized by staggered dosing of hydrochlorothiazide and the resinate, so that hydrochlorothiazide is taken at least 4 hours before or 4-6 hours after administration of the resinate.
Concomitant use with vitamin D may reduce the excretion of calcium via the urine and potentiate the increase of calcium in serum.
When co-administered with calcium salts, hypercalcaemia may occur due to the increase in tubular calcium reuptake.
Concomitant use with ciclosporin may increase the risk of hyperuricaemia and gout-like complications. Thiazides can increase the hyperglycaemic effect of diazoxide.
During concomitant use of methyldopa, there have been uncommon reports of haemolysis, caused by the formation of antibodies against hydrochlorothiazide.
Hydrochlorothiazide may reduce the response to adrenergic amines, such as norepinephrine.
The potassium-depleting effect of hydrochlorothiazide is attenuated by the potassium-sparing effect of telmisartan. However, this effect of hydrochlorothiazide on serum potassium would be expected to be potentiated by other drugs associated with potassium loss and hypokalaemia (e.g. other kaliuretic diuretics, laxatives, corticosteroids, ACTH, amphotericin, carbenoxolone, penicillin G sodium, salicylic acid and derivatives).
If these drugs are to be prescribed with Telmisartan + HCTZ (Micardis Plus), monitoring of potassium plasma levels is advised.
Conversely, based on the experience with the use of other drugs that blunt the renin-angiotensin system, concomitant use of potassium-sparing diuretics, potassium supplements, salt substitutes containing potassium or other drugs that may increase serum potassium levels (e.g. heparin sodium) may lead to increases in serum potassium.
If these drugs are to be prescribed with Telmisartan + HCTZ (Micardis Plus), monitoring of potassium plasma levels is advised.
Periodic monitoring of serum potassium is recommended when Telmisartan + HCTZ (Micardis Plus) is administered with drugs affected by serum potassium disturbances, e.g. digitalis glycosides, anti-arrhythmic agents and drugs known to induce torsades de pointes.
Caution For Usage
Handling Instructions: Due to the hygroscopic property of the tablets they should be taken out of the sealed blister shortly before administration.
Moisture-sensitive tablets-do not remove from blisters until immediately before administration.
Moisture-sensitive tablets-do not remove from blisters until immediately before administration.
Storage
Store at temperatures not exceeding 30°C.
Store in the original package in order to protect from moisture.
Store in the original package in order to protect from moisture.
Action
Pharmacotherapeutic group: Angiotensin II receptor blocker, plain (telmisartan), combination with Diuretics. ATC code: C09DA07.
Pharmacology: Mode of action: Telmisartan + HCTZ (Micardis Plus) is a combination of an angiotensin II receptor blocker, telmisartan, and a thiazide diuretic, hydrochlorothiazide. The combination of these ingredients has an additive antihypertensive effect, reducing blood pressure to a greater degree than either component alone.
Telmisartan + HCTZ (Micardis Plus) once daily produces effective and smooth reductions in blood pressure across the therapeutic dose range.
Telmisartan: Telmisartan is an orally effective and specific angiotensin II receptor (type AT1) antagonist. Telmisartan displaces angiotensin II with very high affinity from its binding site at the AT1 receptor subtype, which is responsible for the known actions of angiotensin II.
Telmisartan does not exhibit any partial agonist activity at the AT1 receptor. Telmisartan selectively binds the AT1 receptor. The binding is long lasting. Telmisartan does not show affinity for other receptors, including AT2 and other less characterised AT receptors.
The functional role of these receptors is not known, nor is the effect of their possible overstimulation by angiotensin II, whose levels are increased by telmisartan. Plasma aldosterone levels are decreased by telmisartan. Telmisartan does not inhibit human plasma renin or block ion channels. Telmisartan does not inhibit angiotensin converting enzyme (kininase II), the enzyme which also degrades bradykinin. Therefore, it is not expected to potentiate bradykinin-mediated adverse effects.
In man, an 80 mg dose of telmisartan almost completely inhibits the angiotensin II evoked blood pressure increase. The inhibitory effect is maintained over 24 hours and still measurable up to 48 hours.
Hydrochlorothiazide: Hydrochlorothiazide is a thiazide diuretic. The mechanism of the antihypertensive effect of thiazide diuretics is not fully known. Thiazides effect the renal tubular mechanisms of electrolyte re-absorption, directly increasing excretion of sodium and chloride in approximately equivalent amounts. The diuretic action of hydrochlorothiazide reduces plasma volume, increases plasma renin activity, increases aldosterone secretion, with consequent increases in urinary potassium and bicarbonate loss, and decreases in serum potassium.
Presumably through blockade of the renin-angiotensin-aldosterone system, co-administration of telmisartan tends to reverse the potassium loss associated with these diuretics.
With hydrochlorothiazides, onset of diuresis occurs in 2 hours, and peak effect occurs at about 4 hours, while the action persists for approximately 6-12 hours; the antihypertensive effects lasts for up to 24 hours.
Pharmacodynamics: Telmisartan: After the first dose of telmisartan, the antihypertensive activity gradually becomes evident within 3 hours. The maximum reduction in blood pressure is generally attained 4 weeks after the start of treatment and is sustained during long-term therapy.
The antihypertensive effect persists constantly over 24 hours after dosing and includes the last 4 hours before the next dose as shown by ambulatory blood pressure measurements. This is confirmed by trough to peak ratios consistently above 80% seen after doses of 40 and 80 mg of telmisartan in placebo controlled clinical studies.
There is an apparent trend to a dose relationship to a time to recovery of baseline SBP. In this respect data concerning DBP are inconsistent.
In patients with hypertension telmisartan reduces both systolic and diastolic blood pressure without affecting pulse rate. The antihypertensive efficacy of telmisartan has been compared to agents representative of other classes of antihypertensive drugs (in clinical trials comparing telmisartan to agents such as amlodipine, atenolol, enalapril, hydrochlorothiazide, losartan, lisinopril, ramipril and valsartan).
Upon abrupt cessation of treatment with telmisartan, blood pressure gradually returns to pre-treatment values over a period of several days without evidence of rebound hypertension.
Telmisartan treatment has been shown in clinical trials to be associated with statistically significant reductions in Left Ventricular Mass and Left Ventricular Mass Index in patients with hypertension and Left Ventricular Hypertrophy.
Telmisartan treatment has been shown in clinical trials (including comparators like losartan, ramipril and valsartan) to be associated with statistically significant reductions in proteinuria (including microalbuminuria and macroalbuminuria) in patients with hypertension and diabetic nephropathy.
The incidence of dry cough was significantly lower in patients treated with telmisartan than in those given angiotensin converting enzyme inhibitors in clinical trials directly comparing the two antihypertensive treatments.
Hydrochlorothiazide: Hydrochlorothiazide inhibits sodium reabsorption primarily in the distal tubule, whereby a maximum of about 15% of sodium filtered by the glomerulus may be excreted. The extent of chloride excretion is roughly equivalent to that of sodium excretion. Potassium excretion is also increased by hydrochlorothiazide and is essentially determined by potassium secretion in the distal tubule and collecting duct (increased sodium and potassium ion exchange). Bicarbonate excretion may be increased by high hydrochlorothiazide doses as a result of carbonic anhydrase inhibition, resulting in urine alkalisation.
The saluretic/diuretic effect of hydrochlorothiazide is not significantly affected by acidosis or alkalosis.
Initially, the glomerular filtration rate is slightly reduced.
During long-term therapy with hydrochlorothiazide, potassium excretion via the kidneys is reduced, which may result in hypercalcaemia.
In hypertensive patients, hydrochlorothiazide has an antihypertensive effect. However, the mechanism has yet to be sufficiently clarified. It has been argued, for instance, that the effect of thiazide diuretics in terms of reducing vascular tone is due to a decrease in sodium concentration in the vascular wall and, hence, due to reduced responsiveness to norepinephrine.
In patients with chronic renal impairment (creatinine clearance less than 30 mL/min and/or serum creatinine above 1.8 mg/100 mL), hydrochlorothiazide has virtually no effect.
In patients with renal and ADH-sensitive diabetes insipidus, hydrochlorothiazide has an antidiuretic effect.
Clinical Trials: Prevention of cardiovascular morbidity and mortality: ONTARGET (ONgoing Telmisartan Alone and in Combination with Ramipril Global Endpoint Trial) compared the effects of telmisartan, ramipril and the combination of telmisartan and ramipril on cardiovascular outcomes in 25620 patients aged 55 years or older with a history of coronary artery disease, stroke, peripheral vascular disease, or diabetes mellitus accompanied by evidence of end-organ damage (e.g. retinopathy, left ventricular hypertrophy, macro- or microalbuminuria), which represents a broad cross-section of cardiovascular high risk patients.
Patients were randomized to one of the three following treatment groups: telmisartan 80 mg (n=8542), ramipril 10 mg (n=8576), or the combination of telmisartan 80 mg plus ramipril 10 mg (n=8502), and followed for a mean observation time of 4.5 years. The population studied was 73% male, 74% Caucasian, 14% Asian and 43% were 65 years of age or older. Hypertension was present in nearly 83% of randomized patients: 69% of patients had a history of hypertension at randomization and an additional 14% had actual blood pressure readings above 140/90 mm Hg. At baseline, the total percentage of patients with a medical history of diabetes was 38% and an additional 3% presented with elevated fasting plasma glucose levels. Baseline therapy included acetylsalicylic acid (76%), statins (62%), beta-blockers (57%), calcium channel blockers (34%), nitrates (29%) and diuretics (28%).
The primary endpoint was a composite of cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, or hospitalization for congestive heart failure.
Adherence to treatment was better for telmisartan than for ramipril or the combination of telmisartan and ramipril, although the study population had been pre-screened for tolerance to treatment with an ACE-inhibitor. The analysis of adverse events leading to permanent treatment discontinuation and of serious adverse events showed that cough and angioedema were less frequently reported in patients treated with telmisartan than in patients treated with ramipril, whereas hypotension was more frequently reported with telmisartan.
Telmisartan had similar efficacy to ramipril in reducing the primary endpoint. The incidence of the primary endpoint was similar in the telmisartan (16.7%), ramipril (16.5%) and telmisartan plus ramipril combination (16.3%) arms. The hazard ratio for telmisartan vs. ramipril was 1.01 (97.5% CI 0.93 -1.10, p (non-inferiority) = 0.0019). The treatment effect was found to persist following corrections for differences in systolic blood pressure at baseline and over time. There was no difference in the primary endpoint based on age, gender, race, baseline therapies or underlying disease.
Telmisartan was also found to be similarly effective to ramipril in several pre-specified secondary endpoints, including a composite of cardiovascular death, non-fatal myocardial infarction, and non-fatal stroke, the primary endpoint in the reference study HOPE (The Heart Outcomes Prevention Evaluation Study), which had investigated the effect of ramipril vs. placebo. The hazard ratio of telmisartan vs. ramipril for this endpoint in ONTARGET was 0.99 (97.5% CI 0.90 -1.08, p (non-inferiority) = 0.0004).
Combining telmisartan with ramipril did not add further benefit over ramipril or telmisartan alone. In addition, there was a significantly higher incidence of hyperkalaemia, renal failure, hypotension and syncope in the combination arm. Therefore the use of a combination of telmisartan and ramipril is not recommended in this population.
Epidemiological studies have shown that long-term treatment with hydrochlorothiazide reduces the risk of cardiovascular mortality and morbidity.
Pharmacokinetics: Concomitant administration of hydrochlorothiazide and telmisartan has no effect on the pharmacokinetics of either drug.
Telmisartan: Absorption: Following oral administration peak concentrations of telmisartan are reached in 0.5-1.5 h after dosing. The absolute bioavailability of telmisartan at 40 mg and 160 mg was 42% and 58%, respectively. Food slightly reduces the bioavailability of telmisartan with a reduction in the area under the plasma concentration time curve (AUC) of about 6% with the 40 mg tablet and about 19% after a 160 mg dose. By 3 hours after administration plasma concentrations are similar whether telmisartan is taken fasting or with food. The small reduction in AUC is not expected to cause a reduction in the therapeutic efficacy.
Distribution: Telmisartan is highly bound to plasma proteins (99.5%) mainly albumin and alpha1-acid glycoprotein. The apparent volume of distribution for telmisartan is approximately 500 litres indicating additional tissue binding.
Biotransformation:Following either intravenous or oral administration of 14C-labelled telmisartan most of the administered dose (>97%) was eliminated in faeces via biliary excretion. Only minute amounts were found in urine.
Telmisartan is metabolised by conjugation to form a pharmacologically inactive acylglucuronide. The glucuronide of the parent compound is the only metabolite that has been identified in humans.
After a single dose of 14C-labelled telmisartan the glucuronide represents approximately 11% of the measured radioactivity in plasma. The cytochrome P450 isoenzymes are not involved in the metabolism of telmisartan.
Elimination: Total plasma clearance (CLtot) is high (approximately 900 mL/min compared with hepatic blood flow (about 1500 mL/min). Terminal elimination half-life was >20 hours.
Linearity: The pharmacokinetics of orally administered telmisartan are non-linear over doses from 20-160 mg with greater than proportional increases of plasma concentrations (Cmax and AUC) with increasing doses. Telmisartan does not accumulate significantly in plasma on repeated administration.
Hydrochlorothiazide: Absorption: Following oral administration of Telmisartan + HCTZ (Micardis Plus) peak concentrations of hydrochlorothiazide are reached in approximately 1.0-3.0 hours after dosing. Based on cumulative renal excretion of hydrochlorothiazide the absolute bioavailability was about 60%.
Distribution: Hydrochlorothiazide is 64% protein bound in the plasma and its apparent volume of distribution is 0.8 ± 0.3 L/kg.
Biotransformation: Hydrochlorothiazide is not metabolised in man and is excreted almost entirely as unchanged drug in urine.
Elimination: About 60% of the oral dose are eliminated as unchanged drug within 48 hours. Renal clearance is about 250-300 mL/min. The terminal elimination half-life of hydrochlorothiazide is 10-15 hours.
PK in specific populations: Gender differences: Gender differences in plasma concentrations of telmisartan were observed, Cmax and AUC being approximately 3- and 2-fold higher, respectively, in females compared to males without relevant influence on efficacy. There was a trend towards higher plasma concentrations of hydrochlorothiazide in female than in male subjects. This is not considered to be of clinical relevance.
Geriatric patients: Pharmacokinetics of telmisartan do not differ between younger and geriatric patients.
Renal impairment: Lower plasma concentrations were observed in patients with renal insufficiency undergoing dialysis. Telmisartan is highly bound to plasma protein in renal-insufficient subjects and cannot be removed by dialysis. The elimination half-life is not changed in patients with renal impairment.
In patients with impaired renal function the rate of hydrochlorothiazide elimination is reduced.
In a typical study in patients with a mean creatinine clearance of 90 mL/min the elimination half-life of hydrochlorothiazide was increased. In functionally anephric patients the elimination half-life is about 34 hours.
Hepatic impairment: Pharmacokinetic studies in patients with hepatic impairment showed an increase in absolute bioavailability up to nearly 100%. The elimination half-life is not changed in patients with hepatic impairment.
Toxicology: In non-clinical safety studies performed with co-administration of telmisartan and hydrochlorothiazide in normotensive rats and dogs, doses producing exposure comparable to that in the clinical therapeutic range caused no additional findings not already observed with administration of either substance alone. There were no toxicological findings observed of relevance to human therapeutic use.
Toxicological findings also well known from non-clinical studies with angiotensin converting enzyme inhibitors and angiotensin II receptor blockers were: a reduction of red cell parameters (erythrocytes, haemoglobin, haematocrit), changes of renal haemodynamics (increased blood urea nitrogen and creatinine), increased plasma renin activity, hypertrophy/hyperplasia of the juxtaglomerular cells and gastric mucosal injury.
Gastric lesions could be prevented/ameliorated by oral saline supplementation and group housing of animals. In dogs renal tubular dilation and atrophy were observed. These findings are considered to be due to the pharmacological activity of telmisartan.
No effects of telmisartan on male or female fertility were observed.
Telmisartan showed no evidence of mutagenicity and relevant clastogenic activity in in vitro studies and no evidence of carcinogenicity in rats and mice. Studies with hydrochlorothiazide have shown equivocal evidence for a genotoxic or carcinogenic effect in some experimental models. However, the extensive human experience with hydrochlorothiazide has failed to show an association between its use and an increase in neoplasms.
There is no clear evidence of a teratogenic or embryotoxic potential for either telmisartan or hydrochlorothiazide administered as single entities or in combination. At toxic doses levels, however, non-clinical studies indicated some hazardous potential of telmisartan to foetal development (increased number of late resorptions in rabbits) and to the postnatal development of the offspring: lower body weight, delayed eye opening, and higher mortality.
Pharmacology: Mode of action: Telmisartan + HCTZ (Micardis Plus) is a combination of an angiotensin II receptor blocker, telmisartan, and a thiazide diuretic, hydrochlorothiazide. The combination of these ingredients has an additive antihypertensive effect, reducing blood pressure to a greater degree than either component alone.
Telmisartan + HCTZ (Micardis Plus) once daily produces effective and smooth reductions in blood pressure across the therapeutic dose range.
Telmisartan: Telmisartan is an orally effective and specific angiotensin II receptor (type AT1) antagonist. Telmisartan displaces angiotensin II with very high affinity from its binding site at the AT1 receptor subtype, which is responsible for the known actions of angiotensin II.
Telmisartan does not exhibit any partial agonist activity at the AT1 receptor. Telmisartan selectively binds the AT1 receptor. The binding is long lasting. Telmisartan does not show affinity for other receptors, including AT2 and other less characterised AT receptors.
The functional role of these receptors is not known, nor is the effect of their possible overstimulation by angiotensin II, whose levels are increased by telmisartan. Plasma aldosterone levels are decreased by telmisartan. Telmisartan does not inhibit human plasma renin or block ion channels. Telmisartan does not inhibit angiotensin converting enzyme (kininase II), the enzyme which also degrades bradykinin. Therefore, it is not expected to potentiate bradykinin-mediated adverse effects.
In man, an 80 mg dose of telmisartan almost completely inhibits the angiotensin II evoked blood pressure increase. The inhibitory effect is maintained over 24 hours and still measurable up to 48 hours.
Hydrochlorothiazide: Hydrochlorothiazide is a thiazide diuretic. The mechanism of the antihypertensive effect of thiazide diuretics is not fully known. Thiazides effect the renal tubular mechanisms of electrolyte re-absorption, directly increasing excretion of sodium and chloride in approximately equivalent amounts. The diuretic action of hydrochlorothiazide reduces plasma volume, increases plasma renin activity, increases aldosterone secretion, with consequent increases in urinary potassium and bicarbonate loss, and decreases in serum potassium.
Presumably through blockade of the renin-angiotensin-aldosterone system, co-administration of telmisartan tends to reverse the potassium loss associated with these diuretics.
With hydrochlorothiazides, onset of diuresis occurs in 2 hours, and peak effect occurs at about 4 hours, while the action persists for approximately 6-12 hours; the antihypertensive effects lasts for up to 24 hours.
Pharmacodynamics: Telmisartan: After the first dose of telmisartan, the antihypertensive activity gradually becomes evident within 3 hours. The maximum reduction in blood pressure is generally attained 4 weeks after the start of treatment and is sustained during long-term therapy.
The antihypertensive effect persists constantly over 24 hours after dosing and includes the last 4 hours before the next dose as shown by ambulatory blood pressure measurements. This is confirmed by trough to peak ratios consistently above 80% seen after doses of 40 and 80 mg of telmisartan in placebo controlled clinical studies.
There is an apparent trend to a dose relationship to a time to recovery of baseline SBP. In this respect data concerning DBP are inconsistent.
In patients with hypertension telmisartan reduces both systolic and diastolic blood pressure without affecting pulse rate. The antihypertensive efficacy of telmisartan has been compared to agents representative of other classes of antihypertensive drugs (in clinical trials comparing telmisartan to agents such as amlodipine, atenolol, enalapril, hydrochlorothiazide, losartan, lisinopril, ramipril and valsartan).
Upon abrupt cessation of treatment with telmisartan, blood pressure gradually returns to pre-treatment values over a period of several days without evidence of rebound hypertension.
Telmisartan treatment has been shown in clinical trials to be associated with statistically significant reductions in Left Ventricular Mass and Left Ventricular Mass Index in patients with hypertension and Left Ventricular Hypertrophy.
Telmisartan treatment has been shown in clinical trials (including comparators like losartan, ramipril and valsartan) to be associated with statistically significant reductions in proteinuria (including microalbuminuria and macroalbuminuria) in patients with hypertension and diabetic nephropathy.
The incidence of dry cough was significantly lower in patients treated with telmisartan than in those given angiotensin converting enzyme inhibitors in clinical trials directly comparing the two antihypertensive treatments.
Hydrochlorothiazide: Hydrochlorothiazide inhibits sodium reabsorption primarily in the distal tubule, whereby a maximum of about 15% of sodium filtered by the glomerulus may be excreted. The extent of chloride excretion is roughly equivalent to that of sodium excretion. Potassium excretion is also increased by hydrochlorothiazide and is essentially determined by potassium secretion in the distal tubule and collecting duct (increased sodium and potassium ion exchange). Bicarbonate excretion may be increased by high hydrochlorothiazide doses as a result of carbonic anhydrase inhibition, resulting in urine alkalisation.
The saluretic/diuretic effect of hydrochlorothiazide is not significantly affected by acidosis or alkalosis.
Initially, the glomerular filtration rate is slightly reduced.
During long-term therapy with hydrochlorothiazide, potassium excretion via the kidneys is reduced, which may result in hypercalcaemia.
In hypertensive patients, hydrochlorothiazide has an antihypertensive effect. However, the mechanism has yet to be sufficiently clarified. It has been argued, for instance, that the effect of thiazide diuretics in terms of reducing vascular tone is due to a decrease in sodium concentration in the vascular wall and, hence, due to reduced responsiveness to norepinephrine.
In patients with chronic renal impairment (creatinine clearance less than 30 mL/min and/or serum creatinine above 1.8 mg/100 mL), hydrochlorothiazide has virtually no effect.
In patients with renal and ADH-sensitive diabetes insipidus, hydrochlorothiazide has an antidiuretic effect.
Clinical Trials: Prevention of cardiovascular morbidity and mortality: ONTARGET (ONgoing Telmisartan Alone and in Combination with Ramipril Global Endpoint Trial) compared the effects of telmisartan, ramipril and the combination of telmisartan and ramipril on cardiovascular outcomes in 25620 patients aged 55 years or older with a history of coronary artery disease, stroke, peripheral vascular disease, or diabetes mellitus accompanied by evidence of end-organ damage (e.g. retinopathy, left ventricular hypertrophy, macro- or microalbuminuria), which represents a broad cross-section of cardiovascular high risk patients.
Patients were randomized to one of the three following treatment groups: telmisartan 80 mg (n=8542), ramipril 10 mg (n=8576), or the combination of telmisartan 80 mg plus ramipril 10 mg (n=8502), and followed for a mean observation time of 4.5 years. The population studied was 73% male, 74% Caucasian, 14% Asian and 43% were 65 years of age or older. Hypertension was present in nearly 83% of randomized patients: 69% of patients had a history of hypertension at randomization and an additional 14% had actual blood pressure readings above 140/90 mm Hg. At baseline, the total percentage of patients with a medical history of diabetes was 38% and an additional 3% presented with elevated fasting plasma glucose levels. Baseline therapy included acetylsalicylic acid (76%), statins (62%), beta-blockers (57%), calcium channel blockers (34%), nitrates (29%) and diuretics (28%).
The primary endpoint was a composite of cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, or hospitalization for congestive heart failure.
Adherence to treatment was better for telmisartan than for ramipril or the combination of telmisartan and ramipril, although the study population had been pre-screened for tolerance to treatment with an ACE-inhibitor. The analysis of adverse events leading to permanent treatment discontinuation and of serious adverse events showed that cough and angioedema were less frequently reported in patients treated with telmisartan than in patients treated with ramipril, whereas hypotension was more frequently reported with telmisartan.
Telmisartan had similar efficacy to ramipril in reducing the primary endpoint. The incidence of the primary endpoint was similar in the telmisartan (16.7%), ramipril (16.5%) and telmisartan plus ramipril combination (16.3%) arms. The hazard ratio for telmisartan vs. ramipril was 1.01 (97.5% CI 0.93 -1.10, p (non-inferiority) = 0.0019). The treatment effect was found to persist following corrections for differences in systolic blood pressure at baseline and over time. There was no difference in the primary endpoint based on age, gender, race, baseline therapies or underlying disease.
Telmisartan was also found to be similarly effective to ramipril in several pre-specified secondary endpoints, including a composite of cardiovascular death, non-fatal myocardial infarction, and non-fatal stroke, the primary endpoint in the reference study HOPE (The Heart Outcomes Prevention Evaluation Study), which had investigated the effect of ramipril vs. placebo. The hazard ratio of telmisartan vs. ramipril for this endpoint in ONTARGET was 0.99 (97.5% CI 0.90 -1.08, p (non-inferiority) = 0.0004).
Combining telmisartan with ramipril did not add further benefit over ramipril or telmisartan alone. In addition, there was a significantly higher incidence of hyperkalaemia, renal failure, hypotension and syncope in the combination arm. Therefore the use of a combination of telmisartan and ramipril is not recommended in this population.
Epidemiological studies have shown that long-term treatment with hydrochlorothiazide reduces the risk of cardiovascular mortality and morbidity.
Pharmacokinetics: Concomitant administration of hydrochlorothiazide and telmisartan has no effect on the pharmacokinetics of either drug.
Telmisartan: Absorption: Following oral administration peak concentrations of telmisartan are reached in 0.5-1.5 h after dosing. The absolute bioavailability of telmisartan at 40 mg and 160 mg was 42% and 58%, respectively. Food slightly reduces the bioavailability of telmisartan with a reduction in the area under the plasma concentration time curve (AUC) of about 6% with the 40 mg tablet and about 19% after a 160 mg dose. By 3 hours after administration plasma concentrations are similar whether telmisartan is taken fasting or with food. The small reduction in AUC is not expected to cause a reduction in the therapeutic efficacy.
Distribution: Telmisartan is highly bound to plasma proteins (99.5%) mainly albumin and alpha1-acid glycoprotein. The apparent volume of distribution for telmisartan is approximately 500 litres indicating additional tissue binding.
Biotransformation:Following either intravenous or oral administration of 14C-labelled telmisartan most of the administered dose (>97%) was eliminated in faeces via biliary excretion. Only minute amounts were found in urine.
Telmisartan is metabolised by conjugation to form a pharmacologically inactive acylglucuronide. The glucuronide of the parent compound is the only metabolite that has been identified in humans.
After a single dose of 14C-labelled telmisartan the glucuronide represents approximately 11% of the measured radioactivity in plasma. The cytochrome P450 isoenzymes are not involved in the metabolism of telmisartan.
Elimination: Total plasma clearance (CLtot) is high (approximately 900 mL/min compared with hepatic blood flow (about 1500 mL/min). Terminal elimination half-life was >20 hours.
Linearity: The pharmacokinetics of orally administered telmisartan are non-linear over doses from 20-160 mg with greater than proportional increases of plasma concentrations (Cmax and AUC) with increasing doses. Telmisartan does not accumulate significantly in plasma on repeated administration.
Hydrochlorothiazide: Absorption: Following oral administration of Telmisartan + HCTZ (Micardis Plus) peak concentrations of hydrochlorothiazide are reached in approximately 1.0-3.0 hours after dosing. Based on cumulative renal excretion of hydrochlorothiazide the absolute bioavailability was about 60%.
Distribution: Hydrochlorothiazide is 64% protein bound in the plasma and its apparent volume of distribution is 0.8 ± 0.3 L/kg.
Biotransformation: Hydrochlorothiazide is not metabolised in man and is excreted almost entirely as unchanged drug in urine.
Elimination: About 60% of the oral dose are eliminated as unchanged drug within 48 hours. Renal clearance is about 250-300 mL/min. The terminal elimination half-life of hydrochlorothiazide is 10-15 hours.
PK in specific populations: Gender differences: Gender differences in plasma concentrations of telmisartan were observed, Cmax and AUC being approximately 3- and 2-fold higher, respectively, in females compared to males without relevant influence on efficacy. There was a trend towards higher plasma concentrations of hydrochlorothiazide in female than in male subjects. This is not considered to be of clinical relevance.
Geriatric patients: Pharmacokinetics of telmisartan do not differ between younger and geriatric patients.
Renal impairment: Lower plasma concentrations were observed in patients with renal insufficiency undergoing dialysis. Telmisartan is highly bound to plasma protein in renal-insufficient subjects and cannot be removed by dialysis. The elimination half-life is not changed in patients with renal impairment.
In patients with impaired renal function the rate of hydrochlorothiazide elimination is reduced.
In a typical study in patients with a mean creatinine clearance of 90 mL/min the elimination half-life of hydrochlorothiazide was increased. In functionally anephric patients the elimination half-life is about 34 hours.
Hepatic impairment: Pharmacokinetic studies in patients with hepatic impairment showed an increase in absolute bioavailability up to nearly 100%. The elimination half-life is not changed in patients with hepatic impairment.
Toxicology: In non-clinical safety studies performed with co-administration of telmisartan and hydrochlorothiazide in normotensive rats and dogs, doses producing exposure comparable to that in the clinical therapeutic range caused no additional findings not already observed with administration of either substance alone. There were no toxicological findings observed of relevance to human therapeutic use.
Toxicological findings also well known from non-clinical studies with angiotensin converting enzyme inhibitors and angiotensin II receptor blockers were: a reduction of red cell parameters (erythrocytes, haemoglobin, haematocrit), changes of renal haemodynamics (increased blood urea nitrogen and creatinine), increased plasma renin activity, hypertrophy/hyperplasia of the juxtaglomerular cells and gastric mucosal injury.
Gastric lesions could be prevented/ameliorated by oral saline supplementation and group housing of animals. In dogs renal tubular dilation and atrophy were observed. These findings are considered to be due to the pharmacological activity of telmisartan.
No effects of telmisartan on male or female fertility were observed.
Telmisartan showed no evidence of mutagenicity and relevant clastogenic activity in in vitro studies and no evidence of carcinogenicity in rats and mice. Studies with hydrochlorothiazide have shown equivocal evidence for a genotoxic or carcinogenic effect in some experimental models. However, the extensive human experience with hydrochlorothiazide has failed to show an association between its use and an increase in neoplasms.
There is no clear evidence of a teratogenic or embryotoxic potential for either telmisartan or hydrochlorothiazide administered as single entities or in combination. At toxic doses levels, however, non-clinical studies indicated some hazardous potential of telmisartan to foetal development (increased number of late resorptions in rabbits) and to the postnatal development of the offspring: lower body weight, delayed eye opening, and higher mortality.
MedsGo Class
Angiotensin II Antagonists / Diuretics
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