metoprolol brands

Molecular formula: C15H25NO3

Metoprolol is a beta-1-adrenergic receptor inhibitor specific to cardiac cells with negligible effect on beta-2 receptors. This inhibition decreases cardiac output by producing negative chronotropic and inotropic effects without presenting activity towards membrane stabilization nor intrinsic sympathomimetics. Beta-adenoreceptor blocking property the amount of beta1 and beta2 effect depends on the cardioselectivity of the drug. Decreased automaticity. Reduced conduction velocity and increased refractoriness in accessory bundles (Wolff- Parkinson-White syndrome). /Class II- beta-Blocking Agents/ At low doses, metoprolol is a selective inhibitor of beta 1-adrenergic receptors. Like propranolol, metoprolol inhibits response to adrenergic stimuli by competitively blocking b1-adrenergic receptors within the myocardium. Unlike propranolol, however, metoprolol blocks b2-adrenergic receptors within bronchial and vascular smooth muscle only in high doses. The precise mechanism of metoprolol's hypotensive action has not been determined. It has been postulated that beta-adrenergic blocking agents reduce blood pressure by blocking peripheral (especially cardiac) adrenergic receptors (decreasing cardiac output), by decreasing sympathetic outflow from the CNS, and/or by suppressing renin release. In the management of angina pectoris, the mechanism of action of metoprolol is thought to be blockage of catecholamine-induced increases in heart rate, velocity and extent of myocardial contraction, and blood pressure, which results in a net decrease in myocardial oxygen consumption. For more Mechanism of Action (Complete) data for METOPROLOL (7 total), please visit the HSDB record page.

Source: PubChem (NCBI) · compound 4171