Does Minoxidil Work? How Long It Takes, What to Expect and Whether You Need It Forever

Short answer: Minoxidil 5% can work for male pattern hair loss, though not for everyone: it is licensed in the UK for moderate male pattern hair loss in adult men (Sons Minoxidil 5% SmPC, section 4.1), and the British Association of Dermatologists says it may help to slow down hair loss and acts as a hair growth stimulant. This product is licensed for men aged 18 to 65. It takes months: the leaflet for Sons Minoxidil 5%, the spray we supply, says you may need to use it twice a day for at least 2 months before you see new hair growth, and the dermatologists say it needs at least 6 months, and possibly up to 12, before any benefit may be noticed. If there is no improvement after a year, the leaflet says to stop, and if you stop, your hair may go back to how it was before you started within 3 to 4 months. The way minoxidil helps hair grow is not fully understood. It is thought to work by widening blood vessels, which improves blood flow to the hair follicles, and by lengthening the growing phase of the hair cycle. Individual results vary.

This guide sets out what the leaflet and the Summary of Product Characteristics (SmPC) for Sons Minoxidil 5%, the British Association of Dermatologists and the NHS say, as of October 2026: whether minoxidil works, how it works, how long it takes, what to expect at 3 months and after a year, the hairline, and what happens when you stop. It is about the 5% spray you put on your scalp, which is for men.

Does minoxidil work?

It works for some men and not for others. Minoxidil 5% is licensed in the UK for moderate male pattern hair loss in adult men (SmPC, section 4.1), and its leaflet calls it a medicine for the scalp that stimulates hair growth in men with male pattern hair loss (section 1). This product is licensed for men aged 18 to 65. Its SmPC says the safety and effectiveness of minoxidil have not been established in adults over 65, or in children and teenagers under 18 (section 4.2).

The product information also says response to treatment is individual (SmPC, section 4.2), and the NHS says the main hair loss treatments, finasteride and minoxidil, do not work for everyone and only work for as long as they are used. It adds that no treatment is 100% effective.

Randomised controlled trials have shown that 5% minoxidil solution produces better results than 2% solution. In a 48-week study of 393 men by Olsen et al. (JAAD 2002), 5% minoxidil produced 45% more hair regrowth than the 2% solution and worked earlier. Individual results vary. That figure compares two strengths of minoxidil with each other, in men aged 18 to 49 in that trial: it does not tell you how much hair you will regrow.

What each UK source says about minoxidil:

How does minoxidil work?

The way minoxidil helps hair grow is not fully understood. It is thought to work by widening blood vessels, which improves blood flow to the hair follicles, and by lengthening the growing phase of the hair cycle. The SmPC uses the hair cycle to explain the extra shedding some men notice soon after starting: it is most likely due to minoxidil shifting hairs from the resting phase of the cycle to the growing phase, so old hairs fall out as new hairs grow in their place (section 4.4).

That growing takes time: the leaflet says hair growth is a slow process, which is why minoxidil is judged over months. Our minoxidil page explains the medicine and how we supply it.

Does minoxidil block DHT?

No. Minoxidil works in a different way. Unlike finasteride it does not affect hormones. Dihydrotestosterone (DHT) is derived from testosterone by the enzyme 5-alpha reductase. Finasteride reduces the conversion of testosterone into DHT, the hormone behind male pattern hair loss. Minoxidil's product information describes its action on blood flow and the hair growth cycle, and does not mention DHT (Sons SmPC, section 5.1).

Minoxidil or finasteride?

Neither is right for every man, and they are different medicines. Finasteride 1mg is a daily tablet, a prescription-only medicine supplied after a GPhC-registered pharmacist reviews your consultation; minoxidil 5% is a pharmacy medicine you spray onto your scalp twice a day, supplied after a pharmacist consultation, no prescription required. There is not enough evidence to recommend using finasteride and minoxidil together, so we do not supply the two together as a plan. If you already use minoxidil, tell our pharmacist during your consultation so they can advise you. The finasteride product information (SmPC, section 4.5) says the same: because data on using finasteride with minoxidil on the scalp for male pattern hair loss are lacking, the combination is not recommended.

Our guide to hair loss treatment in the UK compares the two side by side, and our hair loss page shows both. For the tablet itself, read our guide to finasteride and finasteride side effects.

How long does minoxidil take to work?

Months, not weeks: the leaflet says you may need to use minoxidil twice a day for at least 2 months before you see new hair growth, because hair growth is a slow process, and the British Association of Dermatologists says it needs to be used for at least 6 months, and possibly up to 12, before any benefit may be noticed.

The SmPC, written for healthcare professionals, sits between the two: because response to treatment is individual, a 4-month course may be needed before any signs of hair growth appear (section 4.2). If there is no improvement after one year of use, the leaflet says to stop.

Some men shed more hair 2 to 6 weeks after starting, which usually settles within a couple of weeks (SmPC, section 4.4). Our guide to minoxidil side effects explains why, and when extra shedding means you should stop.

What minoxidil results can you expect at 3 months and after a year?

At 3 months it may still be too early to tell, and a year is the point at which to judge it: the leaflet says new hair can take at least 2 months of twice-daily use to show, the SmPC says a 4-month course may be needed, the dermatologists say any benefit may take 6 to 12 months, and the leaflet says to stop if there is no improvement after one year of use.

A result can mean slower hair loss, some new hair, or both: the British Association of Dermatologists says minoxidil may help to slow down hair loss and acts as a hair growth stimulant. The leaflet says new hair may be soft and downy at the start, but should eventually become the same as normal hair. Individual results vary.

What it will not do is cure male pattern hair loss: the dermatologists say there is no cure, and that the condition tends to progress very slowly, from several years to decades.

How do you know if minoxidil is working?

A reduction in shedding, fewer hairs on the pillow or in the shower, is usually the first sign. Take monthly photos in consistent lighting to track progress. Extra shedding in the first few weeks after starting is different: the SmPC says it usually settles within a couple of weeks (section 4.4). Give it the time set out above before you decide, and keep using it as the leaflet says. Apply 1ml to the scalp, not the hair, twice a day. The hair and scalp must be completely dry when you apply it (leaflet, section 3).

If you are not sure whether it is helping, ask our pharmacist or your GP.

Does minoxidil work on a receding hairline?

The UK product information does not say: Sons Minoxidil 5% is licensed for male pattern hair loss without naming any part of the scalp, and you apply it to the whole affected area, starting in the centre (SmPC, sections 4.1 and 4.2; leaflet, section 3). Neither document gives a separate result for the hairline at the front and the crown on top.

The British Association of Dermatologists describes the usual pattern of male pattern hair loss as a receding hairline at the front and loss of hair from the top of the head, and lists minoxidil 5% as a licensed treatment without separating the two. If your hairline is moving back, our guide to the receding hairline explains the early signs, the Norwood stages and when to see a GP before you start any treatment.

Do you have to use minoxidil forever?

To keep any benefit, you have to keep using it: the leaflet says continued use is necessary to increase and maintain hair regrowth, or hair loss will begin again, and the British Association of Dermatologists says any benefit is only maintained for as long as the treatment is used.

That is because minoxidil treats male pattern hair loss rather than curing it. Whether to carry on is your choice, and you can ask our pharmacist about it at any time; if there is no improvement after a year of use, the leaflet says to stop. If you keep using it, see when you can order more.

What happens when you stop using minoxidil?

The benefit wears off: the leaflet says that when you stop, hair that has regrown may disappear after 3 to 4 months and the hair loss will continue. The SmPC says the same: hair growth may stop when treatment is interrupted, returning to how it was before treatment within 3 to 4 months (section 4.2).

The leaflet lists no side effect that starts after you stop. If you are stopping because of a side effect, our guide to minoxidil side effects says which signs need a doctor straight away.

Can you stop minoxidil without losing hair?

Not according to the product information: neither the leaflet nor the SmPC describes a way to stop and keep the benefit, and the leaflet says hair that has regrown may disappear 3 to 4 months after you stop.

Both give one dose, 1ml twice a day, and neither describes a lower dose for keeping hair or a way of tapering off. If you are thinking of stopping, or of changing treatment, talk to our pharmacist or your GP before you do. Finasteride is a separate medicine with its own consultation, covered earlier in this guide.

Does minoxidil stop working?

The UK product information does not say that minoxidil stops working while you keep using it. What the leaflet says is that if there is no improvement in your hair growth after one year of use, you should stop.

The condition itself also continues: the British Association of Dermatologists says male pattern hair loss tends to progress very slowly, from several years to decades, and that minoxidil may help to slow down the progression of hair loss. So some hair loss can carry on over the years even while you use it. Response to treatment is also individual (SmPC, section 4.2), so it may help one man more than another.

If it seems to have stopped helping, check you are still using it as the leaflet says, and speak to our pharmacist or your GP. If your hair loss becomes patchy or sudden, or your scalp turns red, sore or flaky, see your GP. These signs point to a cause other than male pattern hair loss.

For support, Alopecia UK (alopecia.org.uk) can help, and the British Association of Dermatologists has a patient leaflet.