Diltiazem is a calcium channel blocker. It works by relaxing the muscles of your heart and blood vessels.
Diltiazem may also be used for purposes not listed in this medication guide.
Important information
You should not use diltiazem if you have very low blood pressure, a serious heart condition such as "sick sinus syndrome" or "AV block" (unless you have a pacemaker), or if you have recently had a heart attack and you have a build-up of fluid in your lungs.
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Before taking diltiazem, tell your doctor if you have kidney disease, liver disease, or congestive heart failure.
Diltiazem may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Do not stop taking this medication without first talking to your doctor. If you stop taking diltiazem suddenly, your condition may become worse.
Diltiazem may be only part of a complete program of treatment that also includes diet, exercise, and other medications. Follow your diet, medication, and exercise routines very closely.
If you are being treated for high blood pressure, keep using diltiazem even if you feel well. High blood pressure often has no symptoms.