This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.
Diltiazem is a medicine used to treat high blood pressure.
If you have high blood pressure, taking diltiazem helps to prevent coronary heart disease, heart attacks and strokes.
It works by lowering your blood pressure and making it easier for your heart to pump blood around your body.
Diltiazem is also used to:
- prevent chest pain caused by angina
- reduce the frequency of attacks in Raynaud's phenomenon
- help heal an anal fissure
Diltiazem is available on prescription only. It comes as tablets or capsules to treat high blood pressure, angina or Raynaud's. It's also available as a cream or ointment to treat anal fissures.
View the original NHS website page ↗. Refreshed 19 August 2026.
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