Used for: Treatment and prevention of acute mountain sickness, Oedema, Glaucoma, Epilepsy
Chinese name:

What is Diamox?

Diamox is a brand medication that contains Acetazolamide, which belongs to a class of medications called carbonic anhydrase inhibitors. It works by reducing the pressure in your eyes and hence can be used to treat glaucoma. It can also treat epilepsy and oedema and prevent high altitude disorders.

How to use it?

Diamox is available as tablets.


For glaucoma, take 250–500mg daily.

For epilepsy, take 250–1000mg daily in divided doses. If it is taken with other medicines, take only 250mg daily.

For oedema, take 250–375mg once daily in the morning for 1 or 2 days, alternating with a day of rest.

For mountain sickness, start with 125mg twice daily. It is usually best to start taking the day before climbing up and continue for at least 2 days during your stay at a high altitude.

What are the side effects of Diamox?

Common side effects of Diamox include lightheadedness, flushing, change in taste, frequent urination, blurred vision, abnormal burning and tingling sensation in the arms and legs.

Who should not take Diamox?

  • People who are allergic to any component of Dianox
  • People with severe liver or kidney disease
  • People with reduced blood levels of sodium or potassium

Pharmacist Tips:

  • Although very rare, it may cause severe allergic reactions such as rash, swelling or hives after taking Diamox. If it occurs, stop using it and seek medical care immediately.

Common dosing schedule: 

Take with food to reduce stomach discomfort.

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


Some common medications Diamox may interact with:

  • Aspirin

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

Where to buy Diamox in Hong Kong?

In Hong Kong, Diamox 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 Diamox 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.

Available dosage
  • 250mg (Tablets)
Drug class
Anti-Glaucoma Agents
Sub class
Carbonic Anhydrase Inhibitors
Generic Names
Other drugs in same class
Used for: Ocular hypertension, Glaucoma
Chinese name:
Used for: Treatment and prevention of acute mountain sickness, Glaucoma, Oedema, Epilepsy
Chinese name:
Used for: Migraine prevention, Treatment and prevention of seizures and epilepsy
Chinese name:
Used for: Treatment and prevention of seizures and epilepsy, Migraine prevention
Chinese name: