Minoxidil (Minoxi) for Hair Loss: How to Use It, What to Expect and Side Effects

Minoxidil is one of the two pillars of a home treatment plan for hair loss (Hebrew), and it is suited mainly to hereditary male pattern hair loss (Hebrew) and female pattern hair loss (Hebrew). On this page we explain how it works, how to use it correctly, what you can expect and what the risks are, without brand recommendations and without promises.

What is minoxidil, and how does it help hair?

Minoxidil is a drug that, when applied to the scalp, lengthens the growth phase (anagen) of the hair follicle. It was originally developed as a drug for high blood pressure, and during its use it was discovered to stimulate hair growth. To work, an enzyme in the hair follicle (sulfotransferase) converts it into its active form, minoxidil sulfate. This is one of the reasons the response varies from person to person³.

The European guideline on hereditary hair loss recommends topical minoxidil at the highest grade of recommendation, for both men and women¹. The 2025 Canadian consensus also includes it among the recommended treatments⁵. In women, a Cochrane review found topical minoxidil more effective than placebo, based on moderate-quality evidence⁶.

What minoxidil does not do: it does not treat the hormonal-genetic cause of the hair loss, and it does not bring back hair to an area that has been completely bald for years. It is also not the right treatment for every type of hair loss. In telogen effluvium (Hebrew), for example, treatment starts with finding the cause. That is why it is worth having a hair loss diagnosis (Hebrew) before you start.

How do you use topical minoxidil?

Apply the product to the dry scalp skin in the thinning area, usually twice a day, and not to the hair itself. This is how standard use is described in the patient information leaflet of the U.S. National Library of Medicine². Some practical rules from the same source²:

• Apply to a dry scalp, and wash your hands after applying.
• Do not apply to an irritated, broken or sunburned scalp, because more of the drug is then absorbed into the body.
• Minoxidil may increase the skin’s sensitivity to the sun.
• If you miss a dose, do not double the amount next time.

The exact dose and frequency depend on the product and its concentration, so read the leaflet and consult a doctor or pharmacist. Consistency matters more than quantity: applying more product does not speed up the result, but it does increase the risk of irritation and side effects.

Can you color, wash and style your hair while using minoxidil?

Yes. According to the product leaflet, hair coloring, perms and styling products have not been found to change the effect of minoxidil, but there are a few timing rules. These are the instructions on the label of minoxidil 5% topical in the U.S. National Library of Medicine drug database⁷ and in the UK patient leaflet⁴:

• Washing and getting wet: leave the product on the scalp for about 4 hours before washing or wetting it, so that it is not washed off⁷⁴.
• Styling products: hairspray, gel or mousse can be used once the product has been absorbed into the scalp⁷.
• Before bed: when applying in the evening, let the product dry for 2 to 4 hours before going to sleep⁷.
• Coloring, perms or chemical straightening: wash all the product out of the hair and scalp before the chemical treatment, do not apply it on the same day, and wait 24 hours after the treatment before applying again⁷.
• Change in hair shade: the UK leaflet reports isolated cases of a slight change in hair shade in people with very light hair, when hair products were used at the same time or after swimming in heavily chlorinated water⁴.

Exact instructions vary slightly between products, so check the leaflet of the product you are using.

Solution or foam? 2% or 5%?

The active ingredient is the same in the solution and the foam; the main difference is in the other ingredients. The liquid solution usually contains propylene glycol, the common cause of irritation and contact dermatitis. The foam has no propylene glycol, so it tends to be less irritating, and it also dries faster³.

As for concentration: in men, 5% led to a larger increase in hair density than 2%, but also to more side effects³. In women, a Cochrane review found no meaningful difference in effectiveness⁶. The decision is best made with a doctor. For details on concentrations: minoxidil 2% or 5% (Hebrew); and for a full comparison of the forms: minoxidil foam or solution (Hebrew).

How long does minoxidil take to work?

It takes at least 4 months of regular use, and sometimes up to a year, before an effect can be seen. This is what the patient information leaflet states², and the review on minoxidil describes a peak response at around 12 months of continuous treatment³. Guidelines suggest assessing the response after about 6 months, and continuing if there is improvement¹.

According to the leaflet, the response is better in people younger than 40 and in those whose hair loss is relatively recent². Studies focused mainly on the crown and the middle of the scalp; at the front hairline (receding temples (Hebrew)) the response is less predictable².

To know whether there is a change, photograph your scalp before starting treatment, in the same lighting and from the same angle, and compare after a few months. A day-to-day impression of “more hair in the brush” is not a reliable measure.

Why is there increased shedding at the start of treatment?

Increased shedding in the first weeks is a known, temporary effect, and it is usually not a sign that the treatment is failing. Minoxidil speeds up the transition of follicles from the resting phase to a new growth phase, so “old” hairs fall out earlier than usual and make room for new ones. According to the patient leaflet, this was seen in some patients two to six weeks after starting treatment, and it passes within a few weeks⁴.

This shedding frightens many people and leads them to stop at exactly the wrong moment. If it is very heavy, lasts more than a few weeks, or comes with itching and pain in the scalp, see a doctor to make sure there is no other cause for the hair loss.

What are the side effects of minoxidil, and when should you see a doctor?

Full details are on the page minoxidil side effects (Hebrew).

The common side effects are local: itching, dryness, flaking, redness and burning of the scalp². The usual cause of irritation is the added ingredient, propylene glycol, rather than minoxidil itself³. Another common effect is hypertrichosis: unwanted hair growth on the forehead, cheeks or face. It depends on the concentration, is more common in women, and usually resolves within a few months after stopping treatment³.

See a doctor immediately if general symptoms appear: sudden weight gain, swelling of the face, hands or feet, shortness of breath, a fast heartbeat, chest pain or dizziness². These are rare with topical use, but they are a sign that the drug is being absorbed into the body.

Two safety points worth knowing:

• Pregnancy and breastfeeding: there is not enough safety information, so minoxidil is generally avoided during these periods³. If you become pregnant during treatment, tell your doctor².
• Pets, especially cats: severe poisoning has been reported in cats exposed to topical minoxidil, for example after it was spilled on them⁸. Keep the product closed and out of their reach, and do not let a cat lick your scalp or pillow after application.

Stopping minoxidil: what to expect, in brief

The effect of minoxidil lasts only as long as you use it. After stopping, the hair that was strengthened by the treatment gradually falls out within a few months (in the review: about 3 to 4 months), and the situation returns to what would have been expected without treatment²³. Minoxidil is therefore an ongoing treatment, not a “course”. If you are thinking of stopping because of side effects or inconvenience, first check with a doctor whether the form, concentration or frequency can be changed. For details: what happens when you stop minoxidil (Hebrew).

Oral minoxidil: how is it different?

Low-dose oral minoxidil is an off-label use of the drug, so it is considered only by a doctor, on an individual basis and with follow-up. In a multicenter study of 1,404 patients, the most common side effect was excess body hair, and effects such as dizziness and fluid retention were relatively rare. The study was retrospective and had no control group⁹. In a small controlled trial in men, oral minoxidil was not found to be superior to topical minoxidil after 24 weeks¹⁰. Details on combining it with finasteride and on the other options are on the page how to stop hair loss at home (Hebrew).

Can minoxidil be combined with other treatments?

Yes. Minoxidil is usually the base, and other treatments are added as needed. In men it is often combined with finasteride. In-clinic treatments such as PRP for hair are considered complementary, not a substitute. An anti-hair-loss shampoo (Hebrew) or a biotin supplement (Hebrew) is not a substitute for minoxidil either: a shampoo can help mainly when there is a scalp problem, and a supplement helps mainly when there is a diagnosed deficiency. A detailed comparison of the two is on the page PRP or minoxidil (Hebrew).

What’s new in research (updated November 2026)

In the past two years, consensus statements and recommendations have been published that set out how minoxidil should be used, mainly in tablet form:

• International consensus on oral minoxidil (2025): 43 dermatologists who work with hair loss, from 12 countries, reached a consensus through a Delphi process on prescribing low-dose oral minoxidil, an off-label use. They agreed on 76 statements, including the conditions in which the treatment may help, doses for adults and adolescents, contraindications, tests before starting and follow-up. The consensus was published in JAMA Dermatology and is intended to guide doctors until large trials are available¹¹.
• Oral minoxidil and blood pressure (2025): a meta-analysis in JAAD pooled studies that examined blood pressure in patients taking oral minoxidil at doses of up to 5 mg a day. No significant change in blood pressure was found, but heart rate rose slightly and some patients reported dizziness, and the most common side effect was excess hair growth on the body and face. The studies had no control groups, so evaluation before starting and follow-up remain important¹².
• Recommendations for safe use (2025): a group of dermatologists who work with hair disorders published in JAAD a summary and recommendations for the use of topical minoxidil and low-dose oral minoxidil. The document focuses on what is important to know before starting: dose, follow-up, expected side effects and situations in which it is not used¹³.

These summaries describe the design of the studies and the researchers’ conclusions, and are not a personal recommendation. Any decision about treatment is made only after an examination.

How is minoxidil treatment planned with Dr. Buchbut?

With Dr. Dana Buchbut, who has been treating hair loss for 16 years, the form, the concentration and the combination with other treatments are chosen after a precise trichoscopic diagnosis, with close follow-up of your response.

The information on this page is general and for education only. It does not replace an examination, diagnosis or personal medical advice. Any decision about treatment is made only after an examination.