Who can and cannot take diltiazem

Most adults and children aged 12 years old and over can take diltiazem.

Diltiazem is not suitable for some people.

To make sure it's safe for you, tell your doctor if you:

• have ever had an allergic reaction to diltiazem or any other medicine
• are pregnant, trying to get pregnant or breastfeeding
• have liver disease or kidney disease
• have heart failure or problems with your heartbeat
• have a condition that causes food to move slower than usual through your body
• have a rare inherited condition called porphyria