Does Finasteride Really Work? The Evidence and Results Timeline
What the clinical trials actually show, a month-by-month timeline of what to expect, and how to set realistic expectations for maintenance versus regrowth.
Part of the Male Hair Loss Health Guide.
Key fact: In the pivotal five-year study, 85% of men on finasteride 1mg maintained or regrew hair while the placebo group kept losing it — making it the most evidence-backed oral treatment for male pattern hair loss. But the timeline is slow, and "working" often means stopping loss as much as regrowth.
Start Finasteride Today
Access Doctor provides finasteride following a GPhC-regulated online consultation with our pharmacist independent prescribers.
Order Finasteride →The evidence: what the trials show
Finasteride's reputation rests on unusually strong data for a hair loss treatment. The landmark trials, published in the Journal of the American Academy of Dermatology, followed men with male pattern hair loss over five years against a placebo:
85%
Showed improvement (maintenance or regrowth) over 5 years
65%
Experienced visible regrowth, not just slowed loss
70%
Reduction in scalp DHT driving the effect
The comparison with placebo is what makes the data compelling: men taking the dummy tablet continued to lose hair over the same period, while hair counts in the finasteride group were significantly higher than baseline after two years and stayed elevated. The effect was strongest at the vertex (crown) but also meaningful at the frontal hairline.
For how finasteride produces this effect — the DHT mechanism, dosing and how to take it — see our complete finasteride guide.
Maintenance vs regrowth
The single biggest source of disappointment with finasteride is expecting regrowth when the realistic outcome is maintenance. Both are wins, but they look very different in the mirror:
| Outcome | What it means | How common |
|---|---|---|
| Maintenance | Hair loss stops or slows dramatically; you keep what you have | The majority of men — the core, reliable benefit |
| Regrowth | Miniaturised follicles thicken and previously thin areas fill back in | Around 65% see some visible regrowth, most at the crown |
| Continued loss | Little response — more likely in advanced or long-standing loss | A minority, especially where follicles are already dormant |
Put simply: stopping the loss is the guaranteed goal; regrowth is the welcome bonus. A year where your hair is no worse is a year finasteride worked.
The month-by-month results timeline
1
Months 0–3: the reset
Shedding may temporarily increase as the hair cycle resets. Do not panic — this is expected and does not mean it is failing.
2
Months 3–6: shedding slows
Most men notice they are losing noticeably less hair. This is the first clear sign the treatment is working.
3
Months 6–12: stabilisation and early regrowth
Loss is under control; some men start to see fine regrowth, particularly at the crown.
4
Months 12–24: peak results
Regrowth, where it occurs, becomes clearly visible. Most men reach their maximum benefit in this window.
5
2+ years: maintenance
Results are sustained with continued daily use. Stopping reverses the gains within 6–12 months.
The early shed: why it happens
Many men are alarmed to shed more hair in the first weeks — sometimes called the "dread shed". It is a paradoxical but well-recognised effect: as finasteride synchronises and resets the hair cycle, follicles in the resting phase release their old hairs to make way for new, healthier ones. The hairs coming out are being replaced, not lost for good.
Hold the course. The early shed typically settles within 1–3 months and is often followed by the strongest phase of improvement. Stopping because of it is the most common way men cut short a treatment that was about to work.
Setting realistic expectations
- Finasteride works best started early — the more follicles still active, the more it can preserve and regrow
- It is least effective on areas that are already completely bald, where follicles are dormant
- The frontal hairline and temples respond less reliably than the crown
- Combining it with minoxidil improves results beyond either treatment alone
- Whether it will suit your particular stage of loss is covered in our finasteride suitability guide
How to track your own results
Because change is gradual, it is genuinely hard to judge progress in the mirror day to day — which is why so many men underestimate their own results. The fix is simple:
Take standardised photos
Same lighting, angle and distance — crown, hairline and temples — on day one, then monthly.
Compare at 6 and 12 months
Judge against your baseline photos, not against yesterday. The difference over months is far clearer.
Give it a full year
Do not draw conclusions before 12 months of consistent daily use.
Remember the goal
No further loss is success. Regrowth on top is a bonus, not the baseline.
Start Finasteride and Track Your Results
Complete a short online consultation reviewed by our GPhC-registered pharmacist independent prescribers. If suitable, finasteride is delivered discreetly — usually next day.
Order Finasteride →Frequently Asked Questions
Does finasteride actually work for hair loss?
Yes. In the pivotal five-year trial, 85% of men taking finasteride 1mg showed improvement — either maintaining their hair or regrowing it — while the placebo group continued to lose hair. Around 65% experienced visible regrowth. It is the most clinically proven oral treatment for male pattern hair loss.
How much regrowth can I realistically expect?
Results vary. Some men get noticeable regrowth, particularly at the crown; for others the main benefit is stopping further loss, which is itself a success. Regrowth is most likely in earlier-stage hair loss where follicles are still active, and least likely in areas that are already fully bald.
Why is my hair shedding more after starting finasteride?
A temporary increase in shedding in the first one to three months is normal and expected. As finasteride resets the hair cycle, some resting hairs are pushed out ahead of new, healthier growth. This so-called dread shed is a sign the medicine is acting, not failing, and it settles.
How long before I know if finasteride is working?
Give it at least 12 months. Most men see reduced shedding by 3 to 6 months and regrowth, where it happens, from around 12 months, with maximum results by two years. Judging it too early is the most common reason men wrongly conclude it has not worked.
Does finasteride work forever?
It works for as long as you take it. Finasteride does not cure hair loss — it suppresses the DHT driving it. If you stop, DHT rises again and hair loss resumes within 6 to 12 months, so the gains are maintained only with continued daily use.
References
- Kaufman KD, et al. Finasteride in the treatment of men with androgenetic alopecia. Journal of the American Academy of Dermatology. 1998;39(4):578–589. pubmed.ncbi.nlm.nih.gov
- Rossi A, et al. Finasteride 1mg daily administration on male androgenetic alopecia in different age groups. Journal of Dermatological Treatment. 2011. pubmed.ncbi.nlm.nih.gov
- NICE Clinical Knowledge Summaries. Alopecia — androgenetic. cks.nice.org.uk
- electronic medicines compendium (emc). Finasteride 1mg tablets — Summary of Product Characteristics. medicines.org.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. Finasteride is a prescription-only medicine — always complete a medical consultation before starting treatment. In a medical emergency, call 999.