> Western Medicines > Terazosin

What is Terazosin for?

Terazosin belongs to a class of medications called alpha-blockers. It can relax your blood vessels to lower your blood pressure as well as relax the muscles of your prostate.


Terazosin can therefore be used to treat mild to moderate high blood pressure and benign prostatic hyperplasia.

How to use it?

Terazosin can be taken by mouth as tablets.


If you are using it for treating high blood pressure, you should take 1 mg daily at bedtime for 7 days and may increase it to 2 mg daily if necessary. The maintenance dose is 2-10 mg once daily.


If you are using it for treating benign prostatic hyperplasia, you should start with 1 mg daily at bedtime and may double the dose every 1-2 weeks according to your response to Terazosin. The maintenance dose is 5-10 mg daily and the maximum daily dose is 20 mg.

What are the side effects of Terazosin?

Common side effects of Terazosin include low blood pressure, dizziness, headache, swelling of limbs, and nasal congestion.

Who should not take Terazosin?

  • People who are allergic to Terazosin or any formulation component.

Pharmacist Tips:

  • You should get up slowly from sitting or lying positions as this drug can make you dizzy or lightheaded, especially with the first dose.

Common dosing schedule: 

  • Take Terazosin at the same time every day.

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


Some common medications Terazosin may interact with:

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

Where to buy Terazosin in Hong Kong?

In Hong Kong, Terazosin 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 Terazosin 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.

Brands in Hong Kong
Available dosage
  • 1mg / 2mg / 5mg (Tablets)
Drug class
Vasodilators, Antihypertensives
Sub class
Alpha Blockers