Verapamil 180 mg pills,(brand names: Isoptin,Verelan,Calan,Bosoptin),is an L-type calcium channel blocker used in the treatment of hypertension,angina pectoris,cardiac arrhythmia,and most recently,headaches. Not to be used along with beta-blockers. Class 4 antiarrhythmic,more effective than digoxin in controlling ventricular rate. Approved by FDA in 1981. One of its purified isomers does not cause constipation whereas racemic Verapamil does. Used as a vasodilator during cryopreservation of blood vessels |