CAS Number: 124750-99-8
Angiotensin II [formed from angiotensin I in a reaction catalyzed by angiotensin converting enzyme (ACE, kininase II)] 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. Losartan and its principal active metabolite block 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). There is also an AT2 receptor found in many tissues but it is not known to be associated with cardiovascular homeostasis. Neither losartan nor its principal active metabolite exhibits any partial agonist activity at the AT1 receptor, and both have much greater affinity (about 1000-fold) for the AT1 receptor than for the AT2 receptor. In vitro binding studies indicate that losartan is a reversible, competitive inhibitor of the AT1 receptor. The active metabolite is 10 to 40 times more potent by weight than losartan and appears to be a reversible, non-competitive inhibitor of the AT1 receptor.
Neither losartan nor its active metabolite inhibits ACE (kininase II, the enzyme that converts angiotensin I to angiotensin II and degrades bradykinin), nor do they bind to or block other hormone receptors or ion channels known to be important in cardiovascular regulation.
COZAAR is an angiotensin II receptor blocker (ARB) indicated for:
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Assess any muscle pain or back pain to rule out musculoskeletal pathology; that is, try to determine if pain is drug-induced rather than caused by anatomical or biomechanical problems.
Used to treat high blood pressure. It is also used for diabetic kidney disease, heart failure, and left ventricular enlargement.
Diabetic Nephropathy, Hypertension - 50 mg orally(100 mg max).Pediatric Dose for Hypertension - 0.7 mg/kg orally once a day (up to 50 mg total).
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