This section of the website is for UK men who have already been prescribed Propecia. If you are a healthcare professional, visit the HCP section of the site. This website is not intended to replace the advice of a healthcare professional. You should consult your doctor or another suitably trained healthcare provider when considering what type of treatment is most appropriate for you.

How does your medication work

Male pattern hair loss is hereditary. If you have MPHL you are sensitive to a hormone called dihydrotestosterone (DHT) which circulates in your blood and causes hair follicles to shrink. Over time, the hair follicles may become so small that no hair can grow, causing you to lose your hair.

In certain tissues, notably the scalp, skin, and prostate, testosterone is converted into DHT. Propecia works by blocking the formation of DHT from testosterone, therefore reducing the amount of DHT in your scalp, and so reduces the effect it has on hair follicles.



How long will it take?

Visible results will not be immediate. With continuous use of Propecia, you can expect to see evidence of stabilisation of hair loss in three to six months.

Staying on track - what to expect

You will need to keep taking the treatment to see the benefit, otherwise you may lose the hair you have gained so far within nine to 12 months.



Merck Sharp & Dohme Limited Registered Office: Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU.
A company registered in England and Wales. Company Registration Number: 820771

GB-PRO-00005 | Date of preparation: January 2019
©2018 Merck Sharp & Dohme Limited. All rights reserved