Medication

Topical Minoxidil

The over-the-counter liquid or foam for pattern hair loss. It works for a good share of the people who use it properly, and it almost always sheds before it grows.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
A plain white bottle with a gray applicator tip lying on its side, labeled Minoxidil

Start here

The most useful thing I say about minoxidil gets said before anyone buys a bottle: you are going to shed. In the first two months more hair comes out than usual, which is resting hairs released early to make room for new ones — and it is where most people quit. If the liquid itches or flakes, that is usually the propylene glycol in it rather than the drug, so switch to the foam before you decide the treatment does not suit you. Beyond that it is a routine: on the scalp, every day, for a year, and it stops working when you stop.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledRogaine, Regaine, generic topical minoxidil
Drug classTopical potassium channel opener
Applied as2% or 5% solution, or 5% foam
Typical courseLong term, for as long as you want the effect
Time to work3 to 6 months, judged at 12 months
Prescription onlyNo, sold over the counter

What It Is

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Minoxidil started as a blood pressure tablet. Patients grew hair in places they had not asked for, and the drug was reformulated as a scalp solution for pattern hair loss in the late 1980s. It has been over the counter for decades and is heavily studied. It is approved for pattern hair loss in men and women, and used off-label for other shedding, for eyebrows and beards, and after transplant surgery. It is not a treatment for scarring hair loss, where the follicle has been destroyed.

How It Works

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Minoxidil opens potassium channels and widens small blood vessels, which is why it once lowered blood pressure. On the scalp the useful effect is on the hair cycle, not blood flow: it lengthens the growing phase, shortens the resting phase, and nudges shrunken follicles back toward a thicker, longer hair. That is also the mechanism behind the early shed.

There is a catch in the chemistry. Minoxidil is not the active form; an enzyme in the follicle called sulfotransferase has to convert it to minoxidil sulfate, and people vary widely in how much they have. Someone low in it can apply the liquid perfectly for a year and see nothing — the likeliest explanation for genuine non-responders, and not a matter of trying harder.

Here is where Topical Minoxidil acts in the skin, and what the others do instead.

About Topical Minoxidil
Compare
Skin basics
BARRIEREPIDERMISDERMISHAIRWAKES THE FOLLICLE UPCROSSES EASILYBLOCKS THE HORMONE SIGNAL

Topical Minoxidil works on the follicle itself, lengthening the growing phase and widening a shrunken follicle. Hairs already lost can come back, but only while treatment continues — stopping returns things to where they were. Applied to the scalp. The liquid causes more irritation than the foam.

Minoxidil crosses the scalp barrier and reaches the follicle, which is a few millimetres down. The foam gets in better than the liquid on most scalps because the liquid's propylene glycol is what irritates.

Pattern hair loss is the follicle shrinking a little more each cycle in response to a hormone signal. This blocks that signal, which slows or stops the shrinking. It protects what is there more than it regrows.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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Female Pattern Hair Loss
Female Pattern Hair Loss
Strong evidence
The first treatment for female pattern hair loss and the only one you can buy without a prescription. Five percent foam once a day, applied to the scalp along the part rather than to the hair, lengthens the growing phase and thickens hairs that are still cycling. Expect extra shedding in the first four to eight weeks, judge it at six to twelve months, and know that stopping gives the gain back over about the same period.
Male Pattern Hair Loss
Male Pattern Hair Loss
Strong evidence
The one over-the-counter treatment that genuinely works for pattern hair loss. Applied to the scalp once or twice a day, it lengthens the growing phase and thickens hairs that have already gone fine, so it does most for a crown that is thinning and least where the scalp has been bare for years. Expect more shedding in the first month or two, and expect to keep using it — stopping gives the ground back within six to twelve months.

Not the Best For

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Telogen Effluvium
Telogen Effluvium
Limited evidence
Sometimes used to support regrowth, mainly when a shed has dragged on past six months or has uncovered pattern thinning underneath. The evidence in telogen effluvium itself is thin, because the hair was going to regrow anyway. It also causes a short burst of extra shedding in the first few weeks, which is hard to sit through in the middle of a shed.
Alopecia Areata
Alopecia Areata
Limited evidence
Minoxidil does not switch off the immune attack, so it will not clear a patch on its own here. What it does is support hair that is already coming back, which is why it is usually added to injections or a steroid rather than used by itself. It has to be kept up to keep any benefit.
Bare, shiny scalp
Doesn't work
Minoxidil lengthens the growing phase of a follicle that is still there. Where the scalp is bare and shiny, there is nothing left to lengthen.
A receded hairline
Doesn't work
It can thicken the hairs still growing at the front, but it rarely brings back a corner that has already receded.
Shedding after stress or illness
Doesn't work
It is sometimes used to speed things along, but this kind of shedding is not what minoxidil is for and usually settles by itself once the trigger has passed.

Forms

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The solution is minoxidil in alcohol and propylene glycol, applied with a dropper or spray. It reaches the scalp through hair easily, but the propylene glycol commonly causes itching, flaking and contact dermatitis, and the alcohol stings broken skin.

The foam contains no propylene glycol:

Store-brand generics:

Strengths

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Two strengths, a trade between effect and irritation rather than a ladder to climb.

WeakestStrongest
2%5%
The lower strength
2%
The original. Milder, and the version women were first directed to.
The standard strength
5%
More effective in trials for men and women. The solution irritates more, which the foam solves.

Basics

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When to Apply
On a dry scalp, aimed at the skin rather than the hair. About 1 mL of solution or half a capful of foam over the thinning area, worked in with fingertips. Twice a day for the solutions and for men using foam; the 5% foam sold for women is once daily. Wash your hands afterwards, and let it dry a couple of hours before bed or a hat.
How to Start
Every day from day one, at times you can keep. Missed days are the main reason it fails, and there is no loading period. If the alcohol stings, move to the foam rather than a lower strength.
If It Irritates
Itching, flaking and redness usually come from the propylene glycol in the solution, not the drug, and switching to the foam fixes most cases. A medicated shampoo helps a flaky scalp. Redness that spreads or worsens needs looking at.
If It’s Not Working
Give it a full year of daily, correctly applied use. Applying more, or more often, does not speed it up. If nothing has changed after a year, the follicle may not be converting the drug to its active form — a biological limit, not a discipline problem. Ask about a tablet then.

Sample Routine

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Here is where Topical Minoxidil sits in a day, and what goes around it. Pick what you are treating and what your skin is like, and the rest of the routine changes to suit.

What to Expect

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First few minutes | Applying it
Onto a dry scalp, not the hair, and off the forehead, temples and cheeks.
Weeks 2 to 8 | The shedding phase
More hair comes out than usual, because resting hairs are released early so new ones can start. This is where most people quit, and the growth underneath then never arrives. Mild itching or flaking starts now if the solution is going to irritate.
Months 2 to 4 | The quiet stretch
Shedding settles back to normal and nothing looks better yet. The routine either sticks here or it does not.
Months 4 to 6 | First regrowth
New hairs appear, fine, short and pale. Unwanted hair on the forehead, temples or cheeks shows up now if the product has run onto the face.
Months 6 to 12 | Density
It improves if it is going to, thickest at the crown and mid-scalp — the best-documented result in men and women. In women, a fuller look across the top rather than a new hairline.
After 12 months | Judge it here
Improvement that arrived tends to plateau rather than continue.

What to Avoid

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  • Cats Minoxidil is severely toxic to cats, and small exposures have killed them. Keep the bottle away, let your scalp dry, do not let a cat rub against a treated head, and wash your hands.
  • Letting it run onto the face Unwanted hair on the forehead, temples and cheeks is the most common complaint, and it is nearly always run-off. Apply less, to the scalp only, let it dry, and rinse your face at night.
  • Applying more than the label says A double dose does not double growth. It increases absorption, which is where the ankle swelling and lightheadedness stories come from.
  • Applying to broken or sunburned scalp Far more is absorbed through skin that is not intact, and the alcohol stings.
  • Stopping and restarting Every stop costs the hair the drug was holding, and restarting means the shed again.
  • Judging it at month two The shedding window. Nothing can be concluded there.

Monitoring

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Nothing needs checking for over-the-counter use on an intact scalp. Very little of the drug reaches the bloodstream at normal doses.

The real monitoring is photographic: the same part of your scalp, in the same light, at the start and every three months. Hair change is too slow to see in a daily mirror, and without pictures people abandon treatments that were working.

If You Stop

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No taper. The hair cycle reverts to what it was doing before. Expect a noticeable shed two to three months after stopping, as hairs held in growth move into resting together. Within three to six months the scalp looks as it would have if you never started, and nothing is lost beyond what the drug was holding.

Cost

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Generic minoxidil is cheap — store-brand solution is among the least expensive treatments in dermatology, and the same drug as the branded bottle beside it. Foam costs more, and the gap is worth paying if propylene glycol bothers you. Buying several months at once lowers the monthly cost. Insurance does not cover it, since it is sold over the counter.

Ask Your Doctor

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If your scalp is broken or inflamed
More drug crosses skin that is not intact, and the problem underneath may need treating first.
If irritation persists on the foam
That points to the drug itself rather than the propylene glycol.
If your ankles swell or your heart races
Uncommon with the topical form, but worth checking.
If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy first.
If the hair loss is patchy or sudden
A different problem from pattern hair loss; minoxidil is not the answer.
If unwanted facial hair appears
There are options; start by reviewing the routine.
If you are considering the tablet
A prescription-only, off-label decision that needs a proper assessment.

How It Compares

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FinasterideDiagram: how Finasteride works in the skin
Finasteride
Different job
Works on the hormone rather than the hair cycle, as a daily tablet, with strong evidence in men. Different target, so the two are commonly combined.
Oral minoxidil at low dose
The same
The same drug, swallowed. Often works for people the liquid did nothing for, and it removes the twice-daily routine. Prescription only, off-label, and it carries side effects the topical does not.
Ketoconazole shampoo
Different job
Good for a flaky scalp, weak evidence for hair itself. Sensible as a companion, not a substitute.
MicroneedlingDiagram: how Microneedling works in the skin
Microneedling
Different job
Small studies suggest it may improve results when combined with minoxidil. The evidence is limited and technique varies a lot.
Low-level laser devices
Worse
Cleared for hair loss with modest supporting data. Expensive, harmless, and not a replacement for either mainstream drug.
Platelet-rich plasma
Different job
Repeated injections, growing but inconsistent evidence, and significant cost. Usually considered as an add-on.
Hair transplantDiagram: how Hair Transplant works in the skin
Hair transplant
Different job
The only option for bare scalp, since it relocates follicles rather than stimulating them. Minoxidil is often continued afterwards to protect the hair that was not moved.

Myths

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  • "The shedding means it is damaging my hair." Close to the opposite. Resting hairs are released early so a new growth phase can begin. It happens in the first two months and settles.
  • "It thins your blood or raises your blood pressure." Very little is absorbed through intact scalp. The blood pressure effects belong to the tablet, at far higher doses.
  • "It regrows a receded hairline." Rarely. Its territory is the crown and mid-scalp, and diffuse thinning in women.
  • "It has to stay on for exactly four hours or it does not count." Most absorption happens early. A few hours before washing is a sensible habit, not a rule.
  • "The 5% is only for men." The 5% foam is sold for women, and 5% outperformed 2% in women in trials. Only the frequency differs.

Questions Patients Ask

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Why is my hair falling out more since I started?

The expected early shed, usually between weeks two and eight — resting hairs released so new ones can grow. It settles by month three.

Foam or liquid?

Foam if your scalp is sensitive, flaky or itchy. Liquid if you want the cheapest option and your scalp tolerates it.

Do I have to use it forever?

For as long as you want the result. Stopping returns your scalp to untreated within three to six months.

Can I wash my hair afterwards?

Yes. Leave a few hours between applying and washing.

Will it work on my receding hairline?

Probably not much. Its evidence is the crown and mid-scalp, and diffuse thinning in women.

Is it safe around pets?

Not around cats. Minoxidil is severely toxic to them, so keep it away, let your scalp dry, and wash your hands every time.

References

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