Medicines & Supplements A to Z > Hydrochlorothiazide


Last updated on July 16, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Hydrochlorothiazide


COMMON BRANDS IN HONG KONG: Hydrozide, Apo-Hydro, Dicosia

What is Hydrochlorothiazide for?

Hydrochlorothiazide is a medicine which helps increase the production of urine making it easier to get rid of salt and water (sometimes called a “water pill”). Low doses of hydrochlorothiazide are used to treat high blood pressure. It can also be used to treat swelling caused by fluid accumulation.

How to use it?

Hydrochlorothiazide is taken by mouth. Usual adult doses for high blood pressure range from 12.5 mg to 50 mg taken once daily (usually in the morning). Higher doses, ranging from 25-100 mg per day are used to treat swelling from fluid accumulation (edema).

Wear sunscreen when taking Hydrochlorothiazide as it can make you more sensitive to sunlight. 

What are the side effects of Hydrochlorothiazide? 

Common side effects of Hydrochlorothiazide include dizziness, electrolyte imbalance, and sensitivity to sunlight.

Where to buy Hydrochlorothiazide in Hong Kong?

In Hong Kong, Hydrochlorothiazide 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 Hydrochlorothiazide 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.