Drug Interactions:
Calcium ChannelBlockers

Calcium channel–blockers are used to treat hypertension, angina, heart arrhythmias, and other heart-related conditions.

Drugs in this family include

• amlodipine (Norvasc)
• bepridil hydrochloride (Vascor)
• diltiazem (Cardizem, Cardizem CD, Cardizem SR, Dilacor XR, Tiamate, Tiazac)
•  felodipine (Plendil)
• isradipine (DynaCirc, DynaCirc CR)
• nicardipine hydrochloride (Cardene, Cardene SR)
• nifedipine (Procardia, Procardia XL, Adalat, Adalat CC)
• nimodipine (Nimotop)
• nisoldipine (Sular)
• verapamil (Calan, Calan SR, Covera-HS, Isoptin, Isoptin SR, Verelan)
• and others

Calcium, Vitamin D

Possible Decreased Action of Drug

Taking calcium and vitamin D supplements might interfere with some of the effects of calcium channel–blockers.^1–7 It is very important that you consult your physician before trying this combination.

Last reviewed March 2002 by Medical Review Board

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