Norvasc (Amlodipine besylate) is the besylate salt of amlodipine, a long-acting calcium channel blocker. Norvasc is indicated for the treatment of hypertension. It may be used alone or in combination with other antihypertensive agents. Norvasc is indicated for the treatment of chronic stable angina. Amlodipine besylate may be used alone or in combination with other antianginal agents. It is also indicated for the treatment of confirmed or suspected vasospastic angina. Amlodipine besylate may be used as monotherapy or in combination with other antianginal drugs.

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Calcium channel blockers block the transport of calcium into the smooth muscle cells lining the coronary arteries and other arteries of the body. Since calcium is important in muscle contraction, blocking calcium transport relaxes artery muscles and dilates coronary arteries and other arteries of the body. By relaxing coronary arteries, Amlodipine is useful in preventing chest pain (angina) resulting from coronary artery spasm. Relaxing the muscles lining the arteries of the rest of the body lowers the blood pressure, which reduces the burden on the heart as it pumps blood to the body.
Overdosage might be expected to cause excessive peripheral vasodilation with marked hypotension and possibly a reflex tachycardia. If massive overdose should occur, active cardiac and respiratory monitoring should be instituted. Frequent blood pressure measurements are essential. Should hypotension occur, cardiovascular support including elevation of the extremities and the judicious administration of fluids should be initiated. If hypotension remains unresponsive to these conservative measures, administration of vasopressors (such as phenylephrine) should be considered with attention to circulating volume and urine output.