Medicines & Supplements A to Z > Acetazolamide


Last updated on July 3, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Acetazolamide


COMMON BRANDS IN HONG KONG: Apo-Acetazolamide, Diamox

What is Acetazolamide for?

Acetazolamide belongs to a class of medications called carbonic anhydrase inhibitors. It can reduce the pressure in your eyes and hence can be used to treat glaucoma. It is also effective in treating epilepsy and preventing high altitude disorders.

How to use it?

Acetazolamide can be taken by mouth as tablets. 

If you are using it to treat glaucoma, you should take 250-500 mg daily. 

If you are using it to treat epilepsy, you should take 250-1000 mg daily in divided doses. 

To prevent high altitude illness, the usual dose is 125 mg twice daily. It is usually best to start taking acetazolamide the day before ascent, going up and continue for at least 2 days during your stay at a high altitude.

What are the side effects of Acetazolamide?  

Common side effects of Acetazolamide include frequent urination, abnormal burning or tingling sensation in arms and legs (paresthesia), nearsightedness (myopia), and allergic reactions.

Where to buy Acetazolamide in Hong Kong?

In Hong Kong, Acetazolamide 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 Acetazolamide 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.