Minoxidil for Hair Loss: The Complete Guide
Last reviewed on 25 July 2026. We review our treatment guides every six months to keep them accurate.
Minoxidil is the most widely used over-the-counter treatment for hereditary hair loss, and one of only two medicines the NHS lists as a main treatment for male and female pattern baldness. In the UK it is sold as a topical solution or foam, branded Regaine, and is also prescribed off-label as a low-dose tablet. It is not a cure. Minoxidil works only for as long as you keep using it, and the evidence is stronger for some of its claimed benefits than for others.
This guide explains how minoxidil works, how the topical and oral forms differ, the temporary shedding many people notice in the first weeks, whether the results are permanent, and who the treatment tends to suit. It is general information, not a personal recommendation. Before starting any hair-loss treatment it is worth speaking to your GP or pharmacist, who can check the cause of your hair loss first.
What is minoxidil?
Minoxidil belongs to a group of drugs called vasodilators, which widen blood vessels. It was developed in the 1970s as an oral medicine for severe high blood pressure, sold as Loniten, and its effect on hair was noticed as a side effect: patients taking it grew extra body hair. A topical version for hereditary hair loss followed in 1987, as described in a clinical review on StatPearls.
Today minoxidil comes in two main forms. The topical solution and foam, sold over the counter in the UK in 2% and 5% strengths, is applied directly to the scalp. The tablet is a prescription-only medicine, licensed for resistant high blood pressure and used off-label, at low doses, for hair loss.
How does minoxidil work?
The honest answer is that the exact way minoxidil regrows hair is still not fully understood. Both the manufacturer's prescribing information and clinical reviews state this plainly.
What is known: minoxidil is a potassium-channel opener and a vasodilator. In the scalp, an enzyme called sulfotransferase converts it into its active form, minoxidil sulfate. People carry different levels of this enzyme, which is one reason the treatment works well for some and barely at all for others.
Once active, minoxidil appears to move hair follicles out of the resting (telogen) phase into the growing (anagen) phase, prolong that growth phase, and increase the size of the follicle and the diameter of the hair. It also boosts the blood supply to the follicle, partly by stimulating a signalling protein called VEGF.
Topical minoxidil versus oral minoxidil
Topical minoxidil (Regaine) is the over-the-counter form. It comes as a 2% or 5% solution or foam applied to the scalp, and very little of it, roughly 1 to 2%, is absorbed into the bloodstream through healthy skin, which is why whole-body side effects are uncommon with normal use.
Low-dose oral minoxidil (often shortened to LDOM) is a tablet. It is prescription-only and used off-label for hair loss, typically at 0.25 to 2.5 mg a day, according to clinical reviews. Because a tablet acts on the whole body, it carries systemic side effects the topical form usually does not: unwanted body and facial hair (hypertrichosis), fluid retention and ankle swelling, a faster heartbeat and weight gain. For that reason it is prescribed and monitored by a doctor, including checks on blood pressure and heart rate, and is not something to source or self-dose.
For a fuller comparison, see our guide to topical versus oral minoxidil.
The initial shed
Many people notice more hair falling out in the first few weeks, often called the "dread shed". It happens because minoxidil pushes resting hairs out to make room for new growth. The manufacturer's information notes this shedding usually starts two to six weeks after beginning treatment and settles within a couple of weeks. If it carries on for longer than about two weeks, the advice is to stop and see a doctor. So yes, minoxidil can temporarily cause hair loss, but for most people this early shedding is a sign the treatment is starting to act rather than a reason to stop.
How to use minoxidil
For the topical 5% foam, the usual dose is 1 g, about half a capful, applied to the affected areas of a dry scalp twice a day, with a maximum of 2 g per day. Wash your hands afterwards so the product does not transfer to other skin.
It typically takes at least eight weeks of twice-daily use before any regrowth shows, with fuller results around four months. The manufacturer advises reviewing progress at sixteen weeks and stopping if there has been no improvement. Consistency matters, because skipped applications blunt the results.
Who does minoxidil suit, and how well does it work?
Minoxidil tends to work best for people in the earlier stages of pattern hair loss, where the follicles have not yet shrunk too far, and when it is started within about five years of the hair loss beginning. It is used by both men and women. Women should not use finasteride, so minoxidil is often the first medical option for female pattern hair loss. In general the 5% strength gives greater benefit than the 2%, though women should use the product and strength intended for them and check with a pharmacist or doctor. Results vary from person to person, and as the NHS notes, no hair-loss treatment is 100% effective.
Are the results permanent?
No. This is the single most important thing to understand about minoxidil. The gains last only while you keep using it. The NHS puts it simply: these treatments "only work for as long as they're used". Clinical reviews say the same, that the benefit fades once the drug is stopped, and the manufacturer states that continued applications are needed for continued growth. If you stop, the hair minoxidil was maintaining tends to be lost over the following months, and thinning usually returns to where it would otherwise have been. Minoxidil does not permanently change the underlying, largely genetic, process behind pattern hair loss, so it cannot permanently regrow hair on its own.
Minoxidil and facial hair
Minoxidil is among the facial hair growth products people turn to off-label to encourage beard and facial-hair growth, which is why it appears in searches about how to grow facial hair. It is used this way by both men and women, including those looking to grow facial hair as a woman, though it is not licensed for the purpose and applying it to the face can cause irritation and unwanted hair beyond the target area. We cover the evidence, the method and the risks separately in our guide to minoxidil for beard growth.
Side effects
Topical minoxidil is generally well tolerated. The most common effects are scalp itching, dryness or flaking, and unwanted hair growth on the face or elsewhere if the product transfers to skin off the scalp. Serious effects are rare, but the manufacturer's safety information advises stopping and seeing a doctor if you notice chest pain, a rapid heartbeat, dizziness or faintness, sudden unexplained weight gain, or swollen hands or feet. Oral minoxidil carries the wider, whole-body risks described above and needs medical supervision. Any suspected side effect can be reported through the MHRA Yellow Card scheme.
Alternatives to minoxidil
Minoxidil is not the only option, and it does not work for everyone. Alternatives and complementary treatments include:
- Finasteride, a prescription tablet for male pattern baldness that blocks DHT, the hormone linked to hair loss. It is not used by women.
- Dutasteride, which also blocks DHT and is prescribed off-label for hair loss.
- Caffeine shampoos and rosemary oil, where the evidence is weaker.
- Hair transplant surgery for advanced, stable hair loss, after which minoxidil is sometimes used to help maintain density.
Women can read more in our guide to minoxidil for female hair loss.
Frequently asked questions
How long does minoxidil take to work?
Expect at least eight weeks before you see any change, and around four months for fuller results. The manufacturer suggests reviewing progress at sixteen weeks.
Are the effects of minoxidil permanent? Can it permanently regrow hair?
No. Minoxidil works only while you keep using it. Stop, and the hair it was maintaining is usually lost within a few months. It does not permanently regrow hair or cure the underlying cause of pattern hair loss.
Can minoxidil cause hair loss?
It can cause temporary shedding in the first two to six weeks as resting hairs are pushed out ahead of new growth. This usually settles within a couple of weeks. If shedding continues beyond about two weeks, stop and see a doctor.
Can women use minoxidil?
Yes. Minoxidil is used for female pattern hair loss, and women should not use finasteride. Women should follow the product and strength intended for them and speak to a pharmacist or doctor. See our guide for women.
What is the best time of day to take oral minoxidil?
Oral minoxidil for hair loss is a prescription-only, off-label medicine, taken once or twice a day as your doctor directs. There is no strong evidence that one time of day works better, so the priority is taking it consistently at the same time. Because it can occasionally cause dizziness or fluid retention, your prescriber may suggest a particular timing for you. Always follow their advice.
Can minoxidil be used for beard growth?
It is used off-label for facial hair, though it is not licensed for this and can irritate facial skin. See our beard growth guide for the detail.
Are there any serious side effects of minoxidil?
Serious effects from the topical form are rare. Seek medical advice if you get chest pain, a rapid heartbeat, dizziness, sudden weight gain, or swollen hands or feet. The oral tablet has wider, whole-body risks and needs medical monitoring.
The bottom line
Minoxidil is a well-established, accessible treatment that can slow pattern hair loss and, for many people, regrow some hair, especially when started early. But it asks for patience and commitment: results take months and last only while you keep using it. For anything beyond mild, typical pattern thinning, and before starting the oral form, speak to your GP, pharmacist or a suitably qualified professional about what is right for you.
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