Finasteride Results: What UK Patients Can Realistically Expect

Results data from NICE CKS Alopecia (2023) sources and key MHRA-licensed trial evidence. Individual responses vary significantly. | Back to UK hub

In the key 2-year trials, 83% of men on finasteride 1 mg/day maintained or increased their hair count, compared with 28% on placebo. Two-thirds rated their appearance as improved. These are population averages, outcomes vary by age, Norwood stage, duration of hair loss, and genetic factors.

Realistic UK results timeline

Timeframe	What happens clinically	What you’ll likely notice
Week 1-2	DHT suppressed ~70%. Drug is working, but hair cycle hasn’t responded yet	Nothing visible. This is normal
Month 1-3	Telogen hairs (already programmed to fall) continue shedding; follicles in miniaturisation begin to stabilise	Possible initial shedding (normal, do not stop)
Month 3-6	Shedding rate slows; some follicles returning from miniaturised state enter anagen (growing phase)	Most men notice less active shedding; no obvious regrowth yet
Month 6-12	Newly anagen follicles producing visible terminal hair; hair count measurably increasing in responders	Thicker texture; less scalp show-through; some regrowth in Norwood-vertex area
Month 12-24	Maximum benefit period, key trial endpoints measured at 24 months	Optimal cosmetic result for responders; frontal hairline responds less than vertex
Beyond 24 months	Plateau; maintenance phase, ongoing use required to preserve gains	Continued stability; 5-year extension data confirms maintained benefit

Timeline based on NICE CKS Alopecia (2023); Kaufman 1998 and 5-year extension data; Van Neste phototrichogram data.

What the evidence says about non-responders

Approximately 17% of men in the key trials did not maintain hair count over 2 years despite taking finasteride. Reasons for non-response include:

Advanced hair loss: follicles that have been completely destroyed (scarred follicle sheaths) cannot be revived. Earlier treatment yields better outcomes.
Genetic DHT sensitivity: some men’s follicles are highly sensitive to even the residual DHT present after 70% suppression
Non-AGA hair loss: if hair loss has another cause (alopecia areata, telogen effluvium, scarring alopecia), finasteride will not help; correct diagnosis is essential
Insufficient treatment duration: UK dermatologists generally recommend a minimum 12-month trial before concluding non-response

Results by scalp region

Scalp region	Response to finasteride
Vertex (crown)	Best response, highest density of 5-alpha reductase type II; strongest DHT-driven miniaturisation reversal
Mid-scalp	Good response; most men with Norwood III-IV see measurable benefit
Frontal hairline / temples	Least responsive; finasteride can stabilise but regrowth at the hairline is modest; some benefit possible especially in younger men starting early

What happens when you stop?

Finasteride does not permanently alter hair follicle genetics. When you stop, DHT returns to baseline within 2 weeks, and follicle miniaturisation resumes. Studies show hair count returns to near pre-treatment baseline within 6-12 months of stopping. This is why UK dermatologists emphasise that finasteride is a long-term treatment, not a one-time intervention.

Frequently asked questions

How will I know if finasteride is working?

The most reliable sign is a reduction in active shedding after 3-6 months. Measurable regrowth at the vertex is typically evident at 9-12 months in responders. Some UK dermatologists use standardised global photographs (FotoFinder or similar) to document objective change. If you see no improvement after 12-18 months, discuss with your prescriber.

Will finasteride grow back a receded hairline?

For most men, finasteride is much better at preserving and regrowing at the vertex/crown than at the frontal hairline. Some improvement at the hairline is possible, particularly in younger men who start early with mild recession. Significant regrowth at a receded hairline is uncommon with finasteride alone, combination with minoxidil may add modest frontal benefit.

Is initial shedding a good sign?

It can be. An increase in shedding in the first 1-3 months is often related to follicles transitioning from telogen (resting) to anagen (active growth), a process driven by the change in DHT environment. This “shedding phase” is not universal and does not predict final response, but it is a recognised phenomenon and not a reason to stop.

Sources: NICE CKS: Alopecia (2023). Kaufman KD et al. JAAD 1998;39(4):578-589. Kaufman KD 5-year extension data. Van Neste D et al. Br J Dermatol 2000. Olsen EA et al. JAAD 2006.