Angiotensin II formed from angiotensin I in a reaction catalyzed by angiotensin-converting enzyme (ACE), is a potent vasoconstrictor, the primary vasoactive hormone of the Renin-angiotensin system and an important component in the pathophysiology of hypertension. It also stimulates aldosterone secretion by the adrenal cortex.
Olmesartan Medoxomil blocks the vasoconstrictor and aldosterone-secreting effects of angiotensin II by selectively blocking the binding of angiotensin II to the AT1 receptor found in many tissues, (e.g. vascular smooth muscle, adrenal gland). In vitro binding studies indicate that Olmesartan Medoxomil is a reversible, competitive inhibitor of the AT1 receptor. Olmesartan Medoxomil does not inhibit ACE (kinase II, the enzyme that converts angiotensin I to angiotensin II and degrades bradykinin).
Dosage & Administration
Initial therapy: Initiate with 5/20 mg once daily for 1 to 2 weeks and titrate as needed up to a maximum of 10/40 mg once daily. Due to decreased clearance of Amlodipine among elderly patients the recommended starting dose of Amlodipine is 2.5 mg in patients 75 years. The lowest dose of the combination is 5/20 mg; therefore, initial therapy with this combination drug is not recommended in patients >75 years old.
Pregnancy & Lactation
Precautions & Warnings
- Hypotension in volume- or salt depleted patients.
- Vasodilation in patients with severe aortic stenosis.
- Increased frequency, duration or severity of angina or acute Ml in patients with severe obstructive coronary artery disease.
Use in Special Populations
Pediatric use: The safety and effectiveness have not been established in pediatric patients.
Geriatric use: No overall differences in safety or effectiveness were observed between subjects 65 years of age or older and younger subjects.
Renal impairment: There are no studies in patients with renal impairment.
Hepatic impairment: Initial therapy is not recommended in hepatically impaired patients.