Calcium channel blocking agents restrict the amount of calcium entering cardiac and smooth muscle cells by blocking voltage gated calcium channels this causes blood vessels to relax and widen vasodilate improves oxygen supply to the heart and lowers blood pressure some calcium channel blockers also slow the heart rate. Calcium channel blockers are drugs that block the entry of calcium into the muscle cells of the heart and arteries the entry of calcium is critical for the conduction of the electrical signal that passes from muscle cell to muscle cell of the heart and signals the cells to contract it also is necessary in order for the muscle cells to contract and thereby pump blood. Calcium channel blockers ccb calcium channel antagonists or calcium antagonists are a group of medications that disrupt the movement of calcium ca 2 through calcium channels calcium channel blockers are used as antihypertensive drugs ie as medications to decrease blood pressure in patients with hypertension. Webmd explains how calcium channel blocker drugs can increase the supply of blood and oxygen to the heart. In some cases your doctor might prescribe a calcium channel blocker with other high blood pressure medications or with cholesterol lowering drugs such as statins uses for calcium channel blockers doctors prescribe calcium channel blockers to prevent treat or improve symptoms in a variety of conditions such as high blood pressure
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