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.
Diltiazem can be taken by mouth as tablets or capsules, or given in the 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.
One of the most common side effects of Diltiazem is lower limb swelling, which usually occurs within 2-3 weeks after starting Diltiazem. Because of how calcium channel blockers dilate blood vessels, fluid can accumulate in the lower limbs. If you experience swelling, see your doctor so they can make changes to your blood pressure medicine.
Common dosing schedule:
Diltiazem can be taken with or without food. Evening or bedtime dosing may be the best time to take most of the high blood pressure medicines.
This schedule is for reference only, adjustments may be made according to individual needs.
Some common medications Diltiazem may interact with:
Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.
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 https://www.drugoffice.gov.hk
Need more information?
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.
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