What finasteride is used for
Finasteride is a prescription medicine that can slow male pattern hair loss and help some men retain or regrow scalp hair. It is not a cure, and continued treatment is usually needed to keep the benefit. In the UK, the usual hair-loss strength is 1 mg; the 5 mg strength is used for an enlarged prostate.
A diagnosis comes first. Gradual recession and thinning may be male pattern baldness, but sudden shedding, bald patches or an inflamed scalp can have another cause. Choosing a medicine before establishing that cause can delay the right treatment.
How it affects DHT and hair follicles
Finasteride inhibits the type 2 form of an enzyme called 5-alpha reductase. This reduces the conversion of testosterone into dihydrotestosterone, usually shortened to DHT. In susceptible scalp follicles, DHT contributes to the gradual production of finer, shorter hairs. Reducing its effect can help preserve those follicles.
That does not mean every thinning area will fill in. Keeping the hair you have can be a useful result even when a photograph does not show dramatic regrowth. A medicine cannot promise to rebuild a long-established bald hairline.
What the results evidence shows
The UK Propecia product information describes controlled studies in men with mild to moderate hair loss. Outcomes included hair counts, photographs and patient assessments. The findings support a benefit for some men, but do not provide a personal forecast or a promise that completely bald areas will fill in.
The area being assessed matters. Keeping existing hair, improving coverage on the crown and restoring a long-established bare hairline are different goals. Ask which outcome is realistic for your pattern. A success percentage means little without knowing what the study counted as success and how long participants were followed.
When to judge progress
The UK Propecia product information says that stabilisation can take three to six months of daily treatment. A few weeks is too early to decide whether it has worked. Your prescriber should agree when to review both the response and any adverse effects.
At each review, consider whether loss has slowed, whether density has changed and whether the treatment is tolerable. If nothing appears to be happening, do not increase the dose yourself. Review the diagnosis, consistency of use and photographs with the clinician.
Tablets, missed doses and other medicines
The NHS dosing guidance gives 1 mg once daily as the usual dose for hair loss. Follow the prescription and the leaflet supplied with your own product. Taking more is not a reliable route to better growth. If you miss a dose, follow the leaflet’s instructions and do not take extra tablets to make up for it.
Tell the prescriber about every medicine, supplement and hair-loss product you use. Mention liver problems and any previous reaction to finasteride. Do not combine it with dutasteride, split another person’s prostate medicine or start an online combination without a prescribing assessment.
Side effects and the current UK warning
The NHS describes possible side effects, which include reduced sex drive, difficulty getting an erection and ejaculation problems. Speak to the prescriber if these occur. Breast lumps, nipple discharge or other breast changes also need medical attention. Swelling of the lips, tongue or throat, or difficulty breathing, requires urgent emergency help.
The MHRA’s May 2026 safety update highlights depression, suicidal thoughts and sexual dysfunction; sexual problems may persist after treatment stops. Tell the prescriber about any history of depression or suicidal thoughts. If you develop depression or suicidal thoughts while taking finasteride 1 mg, stop it and contact a doctor as soon as possible. Call 999 if you are at immediate risk of serious harm.
Knowing what to watch for is part of an informed decision. It should not be replaced by claims that side effects are impossible, always temporary or certain to happen.
Who needs particular care
Finasteride is not a routine hair-loss treatment for women or children. A clinician should check whether it is suitable before prescribing, including your medical history and other treatment. Women who are or may be pregnant must not handle crushed or broken tablets because of the risk to a male baby.
If you are trying for a baby, discuss fertility concerns before starting. Tell the clinician arranging any prostate-specific antigen (PSA) blood test that you take finasteride, because it can affect interpretation. Keep that information on your medication list.
Topical finasteride, minoxidil and alternatives
A scalp spray is not automatically free of systemic risks. Topical finasteride formulations vary, so the concentration, licensed status, application instructions and precautions need to be checked for the exact preparation. Do not copy a tablet dose into a homemade scalp solution.
Minoxidil works differently and may be considered on its own or within a clinician’s plan. Dutasteride also reduces DHT, but its UK licence and risk discussion differ. Read those separate guides before treating these medicines as interchangeable. Hair fibres, changes in styling and choosing no medication are also reasonable topics to discuss.
Cost, stopping treatment and transplant planning
Hair-loss finasteride is supplied on a private prescription, rather than routinely funded by the NHS. There is no single UK price: ask for the medicine cost, consultation or prescription fees, review arrangements and any subscription terms before paying.
After stopping, the benefit gradually wears off. Product information describes reversal beginning by about six months and a return towards baseline by nine to twelve months. Do not interpret that as an instruction to carry on through adverse effects.
A transplant redistributes a limited supply of donor hair follicles. Decisions about protecting the surrounding native hair remain separate. If you are considering surgery, bring your medication history and any progress photographs to the consultation.
Crown hair transplant results
Before-and-after photographs from Harley Street Hair Transplants. These show crown transplant results, not the effects of medication alone. Individual results vary.
Read about crown hair transplants.
Planning a useful treatment review
Before starting, agree what you hope to achieve. Is the priority slowing further recession, improving coverage on the crown or deciding whether medicine fits your preferences at all? These goals can lead to different decisions. Write down what would count as a worthwhile benefit and which concerns you want the prescriber to address.
Our explanation of the Norwood scale can help describe the distribution of pattern hair loss. It is not a diagnosis on its own and does not select a medicine for you. Bring any older photographs that show when the pattern changed, especially if a recent period of shedding has made the picture harder to interpret.
For progress photographs, use the same room, lighting and camera position where possible. Photograph the front, top and crown with the hair in a similar condition. Wet hair, different styling, a fresh haircut or a bright overhead light can change the appearance considerably. Ask the clinic how frequently photographs would be useful instead of checking the mirror repeatedly each day.
Keep a simple record of when treatment began, any interruptions, new medicines and symptoms you want to discuss. This is particularly helpful if several treatments have been introduced close together. It gives the clinician a clearer history and reduces the chance of attributing every change to one tablet.
A review should cover tolerability as carefully as appearance. You do not need to wait until a scheduled appointment to report a worrying symptom. Ask who to contact between reviews and what arrangements apply if the original prescriber is unavailable. Keep the patient leaflet and safety card with your medication information.
At the appointment, ask whether the original diagnosis still fits, whether the agreed goal is being met and whether continuing remains a reasonable choice. A stable photograph can be meaningful when hair was previously thinning, but it does not prove every aspect of the treatment is right for you. Side effects, cost and your own priorities all matter.
It is also reasonable to choose no medication. Discuss practical alternatives and what observation alone would involve. If hair loss is affecting confidence or becoming a source of persistent anxiety, mention that directly. A treatment decision should support your wellbeing rather than make daily monitoring feel compulsory.
Questions and answers
Does finasteride work for everyone?
No. Some men see regrowth, some mainly retain existing hair and others do not gain enough benefit to continue. Review the response with the prescriber.
Can I stop once my hair looks better?
The benefit usually depends on continued treatment. Discuss stopping with the prescriber; seek prompt advice about side effects rather than continuing solely to protect the result.
Will finasteride grow my beard?
It is prescribed for scalp pattern hair loss, not as a beard-growth medicine. Sparse facial hair needs a separate assessment.
Is a higher dose better for hair loss?
Do not increase the dose yourself. The usual hair-loss dose is 1 mg daily; a higher-strength tablet has a different usual indication.
Should I take it before a hair transplant?
It may be discussed where ongoing native-hair loss is relevant, but it is not compulsory for every patient. Suitability and timing belong in the individual treatment plan.
Discuss your hair loss in Edinburgh
Bring a list of current medicines and any dated photographs to your assessment. You can ask about the cause of thinning, what treatment could realistically achieve and whether a transplant is appropriate. Request a consultation with Edinburgh Hair Transplant Clinics.
