Lopressor HCT Information

What's inside Lopressor HCT

Lopressor HCT Chemical Information

hydrochlorothiazide - The hydrogenated derivative of chlorothiazide, a thiazide diuretic with antihypertensive and anti-urolithic effects. This agent binds to the electroneutral Na-K-Cl cotransporter (NKCC) and thereby impairs Na+, K+ and Cl- reabsorption on the luminal membrane of the early segment in the distal convoluted tubule in the kidney. This leads to an increase in urinary excretion of sodium, chloride, potassium, bicarbonate and water subsequently reducing plasma and extracellular fluid volume leading to a reduction in blood pressure. Hydrochlorothiazide also decreases urinary calcium and uric acid excretion by direct action on the distal tubule.

metoprolol tartrate - The tartrate salt form of metoprolol, a cardioselective competitive beta-1 adrenergic receptor antagonist with antihypertensive properties and devoid of intrinsic sympathomimetic activity. Metoprolol tartrate antagonizes beta 1-adrenergic receptors in the myocardium, thereby reducing the rate and force of myocardial contraction, and consequently a diminished cardiac output. This agent may also reduce the secretion of renin with subsequent reduction in levels of angiotensin II thus decreasing sympathetic activation, including vasoconstriction, aldosterone secretion.