Verapamil (brand names: Isoptin Verelan Verelan PM Calan Bosoptin Calaptin Covera-HS) is an L-type calcium channel blocker of the phenylalkylamine class. It has been used in the treatment of hypertension angina pectoris cardiac arrhythmia and most recently cluster headaches. It is also an effective preventive medication for migraine. Verapamil has also been used as a vasodilator during cryopreservation of blood vessels.
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