Medication questions Finasteride
How long does finasteride take to work?
Short answer
Most men need to take finasteride 1 mg every day for 3 to 6 months before any effect shows. The UK product information says that is when stabilisation of hair loss can generally be expected. For many men, "working" means losing less hair rather than visible regrowth, results vary, and the benefit lasts only while you keep taking it.
Key facts
- UK product information: 3 to 6 months of daily use before stabilisation of hair loss can generally be expected.
- In the 5-year licensing studies, hair count gains were greatest at 2 years.
- Taking more than one tablet a day does not make finasteride work faster.
- If you stop, the benefit begins to reverse by 6 months and is gone by 9 to 12 months (Propecia SmPC).
What the UK product information says
The summary of product characteristics (SmPC) for Propecia, the original finasteride 1 mg tablet, says: "Generally, three to six months of once daily treatment are required before evidence of stabilisation of hair loss can be expected." The patient leaflet puts it more simply: "It may take 3 to 6 months for the full effect to develop." The NHS gives the same timescale, saying that for hair loss "you can expect to see some improvement after 3 to 6 months".
It is slow because of the hair growth cycle. Finasteride lowers DHT, the hormone that gradually shrinks hair follicles in male pattern hair loss, but follicles have to rest, shed and grow a new hair before any difference shows at the surface.
What "working" actually looks like
It helps to know what to look for, because the most common sign that finasteride is working is that nothing much gets worse. Male pattern hair loss tends to progress without treatment, so holding your current density is a meaningful result, even if it feels like no change at all.
The long-term trials behind the UK licence studied 1,879 men aged 18 to 41 with mild to moderate hair loss on the crown. According to the SmPC, hair count increases in the finasteride group "were greatest at 2 years and gradually declined thereafter to the end of 5 years", while men on placebo kept losing hair. On photographs after 5 years, 48% of men taking finasteride were rated as improved and a further 42% as unchanged.
So some men see thicker hair, many see their hair loss slow or stop, and some see little benefit. The NHS is clear that hair loss treatments "do not work for everyone".
How to judge your own progress
Day-to-day mirror checks are unreliable. Photographs are better: take them in the same place, with the same lighting and at the same angle, before you start and then every few months. Our guide on how to tell if hair loss treatment is working covers what to compare.
At WMG Meds, the first follow-up review is at around 3 months, and the plan is reviewed against your response at around 6 months. Taking more than the prescribed dose does not speed things up. The UK leaflet for generic finasteride 1 mg says finasteride "will not work faster or better if you take it more than once a day".
If it does not seem to be working
Talk to your prescriber rather than stopping on your own. Sometimes the hair loss is not male pattern hair loss at all, or something else is adding to it, such as telogen effluvium (shedding triggered by illness, stress or other changes) or low iron or thyroid problems. Blood tests can help rule those out, and WMG Healthcare has a page on finasteride not working that explains which tests are relevant.
Choosing not to continue is also a valid decision. Non-drug options such as wigs, hairpieces and hair transplant surgery exist, and some men simply decide to accept the change. If you stop, the SmPC says the benefit begins to reverse by 6 months and returns to baseline by 9 to 12 months. Our page on stopping finasteride explains what to expect.
Side effects to know about while you wait
While you are judging whether finasteride is helping, keep an eye on how you feel. The MHRA (the UK medicines regulator) warned in Drug Safety Updates on 29 April 2024 and 11 May 2026 that finasteride is associated with low mood, depression, suicidal thoughts and sexual side effects, and that sexual side effects may persist after stopping. Its advice is to stop finasteride 1 mg immediately and contact your doctor if you develop depression or suicidal thoughts. Our MHRA safety updates page has the detail.
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Why has nothing changed after 3 months on finasteride?
Three months is the earliest point at which the UK product information expects any effect, and many men need closer to 6 months. Hair follicles have to complete a growth cycle before a change can show. If you are 6 months in and unsure, compare photographs taken at the start with recent ones, and raise it at your review.
Can I make finasteride work faster by taking more?
No. The recommended dose for hair loss is one 1 mg tablet a day, and the UK leaflet for generic finasteride 1 mg says it "will not work faster or better if you take it more than once a day". Taking extra only adds medicine to your system without adding benefit.
How long do I need to keep taking finasteride?
For as long as you want the benefit. The SmPC says "continuous use is recommended to sustain benefit". There is no fixed end date, which is why regular reviews with your prescriber matter, so you can weigh up the benefit against any side effects over time.
What happens if I stop finasteride?
The Propecia SmPC says that if treatment is stopped, "the beneficial effects begin to reverse by six months and return to baseline by 9 to 12 months". In other words, your hair returns to where it would have been without treatment. Speak to your prescriber before stopping, unless you develop depression or suicidal thoughts, in which case stop and contact your doctor straight away.
Does finasteride work for everyone?
No. The NHS says hair loss treatments "do not work for everyone" and "only work for as long as they're used". In the licensing studies, most men either improved or stayed the same over 5 years, but a minority continued to lose hair. A doctor-led free assessment can check whether finasteride is a sensible option for your type of hair loss.
Sources
- Propecia 1 mg film-coated tablets: summary of product characteristics (eMC, revised 29 June 2026)
- Propecia 1 mg: patient information leaflet (eMC, revised May 2026)
- Finasteride 1 mg film-coated tablets (Milpharm): patient information leaflet (eMC)
- NHS: Common questions about finasteride
- NHS: Hair loss
Facts checked against these sources on 4 October 2026. This page is general information, not personal medical advice. Read our editorial policy.