Medicines & Supplements A to Z > Tamsulosin


Last updated on July 12, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  


GENERIC NAME: Tamsulosin


COMMON BRANDS IN HONG KONG: Harnal OCAS 奧利新, Harnal D, Maxrin, Duodart (tamsulosin and dutasteride)

What is Tamsulosin for?

Tamsulosin belongs to a class of medications called alpha blockers like Prazosin. It can relax the muscles in your prostate and bladder and is therefore used to treat benign prostatic hypertrophy (BPH), and urinary incontinence.  

How to use it?

Tamsulosin can be taken by mouth as tablets and capsules. It is available as both conventional medicines or modified-release medicines. You should start with 0.4 mg once daily and may increase to 0.8 mg once daily if no benefits are observed after 2-4 weeks. Tamsulosin should be taken at the same time every day with or without food. Do not open, crush or chew capsules.

What are the side effects of Tamsulosin? 

Common side effects of Tamsulosin include dizziness, headache, low blood pressure, and ejaculation dysfunction.

Where to buy Tamsulosin in Hong Kong?

In Hong Kong, Tamsulosin 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 Tamsulosin 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.