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Freebase(0.00 / 0 votes)Rate this definition: Diltiazem. Diltiazem is a nondihydropyridine member of the class of drugs known as calcium channel blockers, used in the treatment of hypertension, angina pectoris, and some types of arrhythmia. It is also an effective preventive medication for migraine. It is a class 3 antianginal drug, and a class IV antiarrhythmic.
Hello, Diltiazem HCl is a calcium channel blocker that does not contain the diuretic hydrochlorothiazide. It is sold under several brand names including Cardiazem LA, Dilacor, and Tiazac.Verapamil HCl also does not contain HCTZ.hen i was given a beta blocker with the initials hcl after it it had a diuretic in it and was warned to drink lots of water and stay out of the sun to prevent photosensitivity because it had a diuretic in it and the diltiazem had the same warnings in it because it has a diuretic in it.