Isoptin Active ingredient: verapamil $0.39 for pill Isoptin is used for treating high blood pressure. Hydrochlorothiazide $0.28 for pill Hydrochlorothiazide is a thiazide diuretic that helps the kidneys to remove fluid from the body.

Calan Active ingredient: verapamil $0.33 for pill Calan is used for treating supraventricular tachycardia, a rhythm disturbance of the heart.