Medicines & Supplements A to Z > Dapsone


Last updated on 11/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  


ALTERNATIVE NAME: Diaminodiphenyl sulfone



DRUG CLASS: Antileprosy agents, Antibiotics

SUB CLASS: Antimycobacterials

USED FOR: Leprosy, Dermatitis herpetiformis

– 100mg (tablets)

What is Dapsone for?

Dapsone belongs to a class of medications called antimycobacterials. It works by inhibiting the growth of bacteria to treat leprosy and dermatitis herpetiformis.

How to use it?

Dapsone is taken orally as tablets. 

For leprosy, in combination with other antileprosy agents:
100 mg once daily in combination with antileprosy drugs (such as Rifampin) for at least 2 years (multibacillary leprosy) or at least 6-12 months (paucibacillary leprosy).

For dermatitis herpetiformis:
50 mg once daily, and can be increased up to 300 mg daily if needed. Once lesions have begun to subside, the dose should be reduced to a minimum maintenance dose as soon as possible.

What are the side effects of Dapsone?

Common side effects of Dapsone include peripheral neuropathy, nausea, vomiting, abdominal pain, pancreatitis, blurred vision, insomnia, fever, or headache.

Who should not take Dapsone?

People who are allergic to Dapsone or any component of the formulation.

Pharmacist Tips:

– Tell your doctor if you are pregnant or breastfeeding, or if you have anemia or other blood problems, liver disease, or a G6PD deficiency.
– Report any symptoms including rash, pruititis, fever, or abnormal vision immediately.

Common dosing schedule:
Dapsone can be taken with food if an upset stomach occurs. 

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Dapsone may interact with:
– Rifampin

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Dapsone in Hong Kong?

In Hong Kong, Dapsone 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

Need more information?

For detailed information about the use of Dapsone 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.