Take diltiazem exactly as prescribed by your doctor. Follow all directions on your prescription label. Your doctor may occasionally change your dose. Do not use this medicine in larger or smaller amounts or for longer than recommended.
Do not crush, chew, break, or open an extended-release diltiazem tablet or capsule. Swallow it whole.
To make swallowing easier, ask your doctor or pharmacist if you can open a diltiazem capsule and sprinkle the medicine into a spoonful of applesauce. Swallow right away without chewing. Do not save the mixture for later use.
Use diltiazem regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.
You should not stop using diltiazem suddenly. Stopping suddenly may make your condition worse.
If you are being treated for high blood pressure, keep using this medicine even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medicine for the rest of your life.
Your blood pressure will need to be checked often. You may also need frequent blood tests.
Store diltiazem at room temperature away from moisture and heat.
 Detailed Diltiazem dosage information
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose of diltiazem can be fatal.
Overdose symptoms may include slow heartbeat, weakness, chest pain, shortness of breath, or fainting.
