Losartan and hydrochlorothiazide are commonly combined to treat hypertension, providing additive blood pressure-lowering effects with generally safe co-administration.
Commonly prescribed together for better blood pressure control.
Watch for signs of electrolyte imbalance, such as muscle weakness or irregular heartbeat.
Avoid in patients with severe renal impairment (CrCl <30 mL/min) without monitoring.
Ensure adequate hydration to prevent dehydration from diuretic effect.
Losartan, an angiotensin II receptor blocker (ARB), inhibits the binding of angiotensin II to AT1 receptors, leading to vasodilation and reduced aldosterone secretion. Hydrochlorothiazide, a thiazide diuretic, inhibits the sodium-chloride symporter in the distal convoluted tubule, promoting natriuresis and diuresis. Together, they synergistically reduce blood volume and vascular resistance, enhancing antihypertensive efficacy without significant adverse pharmacokinetic interactions.
The combination increases the risk of mild hypotension, hypokalemia, hyperuricemia, and renal function impairment, particularly in patients with pre-existing conditions like dehydration or renal disease. No major adverse interactions are reported.
Use the fixed-dose combination (e.g., Hyzaar) as prescribed for hypertension. Monitor blood pressure, serum electrolytes (especially potassium), renal function, and uric acid levels regularly, especially at initiation or dose adjustment. Adjust doses in elderly patients or those with renal impairment.
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