This medication is used to prevent certain types of chest
pain (angina). It may allow you to exercise more and decrease the frequency of
angina attacks. Nifedipine belongs to a class of medications known as calcium
channel blockers. It works by relaxing blood vessels so blood can flow more
easily. This medication must be taken regularly to be effective. It should not
be used to treat attacks of chest pain when they occur. Use other medications
(such as sublingual nitroglycerin) to relieve attacks of chest pain as directed
by your doctor. Consult your doctor or pharmacist for details.