Medicines & Supplements A to Z > Propecia


Last updated on 18/10/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Finasteride


DRUG CLASS: Antiandrogens

SUB CLASS: 5-alpha reductase inhibitors

USED FOR: Male hair loss

– 1mg (tablets)

What is Propecia for?

Propecia is a brand product that contains Finasteride, which belongs to a class of medications called 5 alpha-reductase inhibitors. It works by blocking the production of a certain hormone related to hair loss. It is therefore used to treat hair loss (in men only).

How to use it?

Propecia is available as tablets and can be taken orally. For male hair loss, the usual starting dosage is 1 mg once daily for at least 3 months.

What are the side effects of Propecia?

Common side effects of Propecia include dizziness, tiredness and decreased sex drive.

Who should not take Propecia?

– People who are allergic to finasteride or any component of the formulation
Pregnant women

Pharmacist Tips:

– Propecia may take up to 3 months to see the full effect. Keep taking the tablet even if you feel well.
– Propecia tablets can be absorbed through the skin. It should not be handled by a woman who has childbearing potential.
– Avoid exposure of Propecia to male infants, as it can cause abnormalities of the genitals.

Common dosing schedule:
Propecia can be taken with or without food. Take 1 mg once daily for at least 3 months.

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

Some common medications Propecia may interact with:
– Antibiotics, ie. Clarithromycin, Erythromycin
– Antifungals, ie. Itraconazole, Ketoconazole

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

Where to buy Propecia in Hong Kong?

In Hong Kong, Propecia 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

Need more information?

For detailed information about the use of Propecia 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.