Medicines & Supplements A to Z > Diltiazem


Last updated on July 3, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Diltiazem 


COMMON BRANDS IN HONG KONG: Herbesser, Cartil, Messer, Wontizem 

What is Diltiazem for?

Diltiazem belongs to a class of medications called calcium channel blockers. It is used to treat and prevent angina, control abnormal heart rhythms (e.g. atrial fibrillation), and treat high blood pressure. It is also occasionally used for anal fissures.

How to use it?

Diltiazem can be taken by mouth as tablets or capsules, or given in hospital by injection. Usual oral starting doses of immediate release Diltiazem are 30 to 60 mg four times per day. The maximum daily dose is often 480 mg per day (120 mg four times per day). Long-acting (sustained release) products have less frequent dosing and should not be crushed. Examples of long-acting Diltiazem products are Herbesser R (or equivalent) and Herbesser SR (or equivalent), and they are taken on a daily basis.

Side effects of Diltiazem

Common side effects of Diltiazem include dizziness, low heart rate, low blood pressure, flushing, headache, nausea and vomiting, palpitations, lower leg swelling, cardiac conduction disorders, and constipation.

Where to buy Diltiazem in Hong Kong?

In Hong Kong, Diltiazem is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

For detailed information about the use of Diltiazem in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.