What is Finasteride?
Finasteride is a 5-alpha reductase inhibitor. It works by blocking the conversion of testosterone into DHT, effectively lowering DHT levels in the body and helping to slow down or reverse the progression of hair loss.
The branded medication Propecia® was developed by Merck Sharp & Dohme (MSD) and has been approved by regulatory authorities in various countries for the treatment of male pattern hair loss.
Efficacy and Clinical Support
Reduction of DHT levels: Studies have shown that taking finasteride 1mg orally once daily can reduce serum DHT levels by up to 70%.
Promotion of hair regrowth: A 5-year study reported that 65% of users experienced hair regrowth after treatment.
Slowing hair loss progression: According to clinical data, around 90% of users successfully controlled hair loss within 2 years, with no significant worsening.
Correct Usage
Dosage: Take 1mg once daily, preferably at a fixed time each day. It may be taken with or without food.
Treatment duration: Initial results usually require continuous use for at least 3 months. If treatment is stopped, the effect will gradually diminish.
Follow-up assessment: It is recommended to follow up with a doctor every 3 to 6 months to review treatment response and monitor for any side effects.
Common Side Effects and Safety
Side effects of finasteride are generally uncommon. Most are mild and reversible. Commonly reported side effects include:
 
 
Reduced libido, around 1–2%
 
 
Erectile dysfunction, less than 1%
 
 
Reduced semen volume
 
 
Psychological effects, with a small number of cases reporting low mood

According to the U.S. FDA and multiple large-scale studies, most side effects resolve after stopping the medication, although a very small number of cases may persist for a longer period.
Who is Suitable for Finasteride?
Gender: Finasteride is intended for use by men only. Women should only use it after assessment by a doctor. Pregnant women must not come into contact with crushed or broken tablets.
Age: It is generally recommended for adults aged 18 or above.
Medical conditions: People with liver impairment or those currently using other hormonal medications should inform their doctor before use.
Purchase and Prescription Process in Hong Kong
Finasteride, including the branded medication Propecia®, is a prescription medication in Hong Kong and cannot be freely purchased from ordinary pharmacies without proper medical assessment.
It is recommended to consult a registered doctor through an online healthcare platform such as FastMed (fastmedhk.com). After remote medical consultation and assessment, a registered doctor may issue a prescription if appropriate. Medication delivery can then be arranged, with delivery available in as fast as 4 hours. The process is private, secure, and efficient.
Important Notes for Users
Treatment results vary from person to person, and it may take several months to see visible improvement.
Do not adjust the dosage by yourself, as this may increase the risk of side effects.
If you feel unwell or experience persistent side effects, stop taking the medication and contact your doctor immediately.
Do not use finasteride together with other hair loss medications unless instructed by your doctor.
Conclusion: Treat Early to Manage Hair Loss
Although male pattern hair loss is not life-threatening, it can have a significant impact on appearance and psychological wellbeing. Finasteride is supported by scientific evidence and is one of the mainstream treatment options currently available, with a recognised profile for efficacy and safety.
With regular medical assessment and correct usage, finasteride may help slow down or even improve hair loss. If you are experiencing reduced hair volume or have a family history of hair loss, consider consulting a doctor early to assess whether finasteride is suitable for your condition and help restore confidence and hair density.