<unk> , sold under<unk> arious trade names, is a calcium channel blocker medication used for the treatment of high blood pressure, angina (chest pain from not enough blood flow to the heart), and supraventricular tachycardia. It may also be used for the prevention of migraines and cluster headaches. It is given by mouth or by injection into a<unk> ein. Common side effects include headache, low blood pressure, nausea, and constipation. Other side effects include allergic reactions and muscle pains. It is not recommended in people with a slow heart rate or heart failure. It is believed to cause problems for the fetus if used during pregnancy. It is in the non–dihydropyridine calcium channel blocker family of medications.<unk>  was approved for medical use in the United States in 1981. It is on the World Health Organization's List of Essential Medicines.<unk>  is available as a generic medication. Long acting formulations exist. In 2019, it was the 141st most commonly prescribed medication in the United States, with more than 4million prescriptions.
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