Does minoxidil actually regrow hair?
Srikanth Katikala Last reviewed: 22 October 2026This page is for you if you already know it is pattern thinning. If you are not sure, start with Hair Loss Is Not One Thing.
Everyone has an opinion on minoxidil. So, we went through the evidence from 19 studies instead. The picture is clear: minoxidil can help, but less than most people hope, and only for as long as you keep using it.
In these studies, about 1 in 4 women using minoxidil saw moderate or marked regrowth, against about 1 in 7 using a dummy treatment (a placebo). Six months is a useful point for assessing whether treatment is helping. The gains, however, tend to fade after treatment stops.
What is the success rate?
Minoxidil roughly doubles the chance of moderate or high regrowth, from about 1 in 7 to about 1 in 4. Many studies point the same way, so we are fairly confident it helps. For the other 3 in 4 women, regrowth was slight or none.
The figures are scaled from pooled studies of about 1,150 women, mostly using a 2% liquid for 24 to 32 weeks:
| Moderate or high regrowth, per 100 women | Women's self-rating | Doctors' rating |
|---|---|---|
| Minoxidil | 27 | 18 |
| Placebo | 14 | 8 |
These figures come from a Cochrane review that pooled the studies[1]. One of those studies was run in Japan. In 280 women, a weaker 1% solution beat a placebo: about 3 in 10 against about 1 in 8 had moderate or better regrowth in the doctors' rating[3]. That matters for readers in Singapore, and the review rated the study low risk of bias, a mark only about 10% of its studies earned[1].
In men, one 48-week study of 393 men found that 5% minoxidil grew more hair than 2%[2].
How long does minoxidil take to work?
Minoxidil takes time to show its full effect. Some people may notice early changes within about eight weeks, but that is not the same as reaching the best result[4][5].
In many studies, researchers assessed results after about six months. In one 24-week study of women using 5% minoxidil alone, hair density showed no clear change at three months but had increased by about 10% at six months[6].
Our reading: six months is a reasonable point to assess whether minoxidil is helping, rather than a deadline by which everyone should see regrowth.
Some people also notice increased shedding in the first weeks of treatment. This is described as temporary and may be related to minoxidil changing the hair-growth cycle[2][5]. If shedding is severe or persists, discuss it with a clinician.
What are the side effects, and why do some people avoid minoxidil?
In the studies, reported side effects were mostly mild, with scalp itching and irritation among those noted in the main review[1]. Not every symptom was measured consistently across studies. Commonly reported side effects:
| Side effect | What the evidence says | What helps |
|---|---|---|
| Itchy, irritated or flaky scalp | Itch and irritation top the review's list of mild effects[1]. Much of it likely comes from the liquid base (propylene glycol)[5]. | Foam versions do not contain propylene glycol[5] and switching may help. |
| Unwanted facial hair (sideburns, forehead) | In a 48-week study of 381 women: nearly 1 in 2 on 5%, about 1 in 5 on 2%, about 1 in 6 on a placebo[1]. | The study found fewer cases with 2% than with 5%. Ask your prescriber if lower works. |
| Extra shedding early on | Some people report increased shedding when starting minoxidil. The review's studies did not report it[1][5]. | It may be temporary, but severe or persistent shedding should be discussed with a clinician. |
| Allergic rash on the scalp | Can come from minoxidil or from propylene glycol[5]. | Contact a doctor if the rash persists. A formulation without propylene glycol may help if that ingredient is responsible, but it will not prevent every allergic reaction. |
Hair growing where you do not want it, or a persistent scalp rash, is worth discussing with your prescriber. Check the patient leaflet for the specific product you use. Seek urgent medical attention for serious symptoms such as difficulty breathing, or chest pain[4][5].
One reason some people avoid minoxidil is that the benefit generally requires continued use. If treatment stops, regrown hair may gradually be lost again; see what happens if you stop.
Who shouldn't use minoxidil?
Typically these are reasons not to use it[4][5]:
- pregnancy or breastfeeding
- hair loss after childbirth
- being under 18 or over 65
- sudden, patchy or unexplained hair loss
- a sore, red or inflamed scalp
The age limits come from the leaflet and may differ by product. Whether minoxidil suits you is a doctor's decision.
What happens if I stop using minoxidil?
Hair loss is expected to return soon after treatment ends[1]. The leaflet says regrown hair may disappear within 3 to 4 months, because the balding process carries on underneath[4]. That makes minoxidil a maintenance treatment, not a cure, and the hair cycle explains why. The only data we found on stopping are from a 1990 study in men, summarised in a review: in 31 men on a 3% liquid, hair went back to where it started after treatment was stopped suddenly[2].
Common questions
Is 5% minoxidil too strong?
In women the results are mixed. Four studies compared 2% with 5% in 1,006 women: doctors saw no difference, and the pooled hair counts were similar[1]. One of them counted slightly more hairs on 5%[2]. Unwanted hair was about twice as common on 5% in the one study that counted it[1]. In men, 5% did better than 2%[2].
Can I skip minoxidil for a few days?
Carry on as normal. The leaflet says that if you miss one or two applications, you continue as if you had not missed the dose, and do not use extra to catch up, because too much can cause low blood pressure, a fast heartbeat and drowsiness[4]. Longer gaps are different: regrown hair may be lost after 3 to 4 months without treatment[4].
Can I use minoxidil for 20 years?
Nobody has tested that. The longest study we found ran 5 years, in men: regrowth peaked at year 1, then slowly declined[2]. In women the longest studies ran about a year[1].
How does rosemary oil compare with minoxidil?
Minoxidil has much stronger evidence for treating pattern hair loss. Rosemary oil has limited clinical evidence, including a study in men that compared it with 2% minoxidil; that study alone does not establish that rosemary oil works as well as minoxidil. Rosemary oil can also irritate the skin or cause contact allergy. Read more in our article on what hair oil can and cannot do.
Editorial note
The main evidence in this article comes from a Cochrane review of 17 minoxidil studies of treatments for female pattern hair loss. Funding was, as declared, mostly from drug companies. The review itself was funded by the UK's National Institute for Health Research.
The article also draws on five other sources. One is a 48-week study of 5% and 2% minoxidil in 381 women, supported by minoxidil manufacturer Pfizer (formerly Upjohn), which counted unwanted hair among its outcomes. Another is the Japanese study, supported by Taisho Pharmaceutical, of which we read the abstract only. The others are a review summarising studies in men and one 24-week study of 5% minoxidil in women. In that last study, participants knew which treatment they were receiving, which is a limitation when interpreting the results.
This article is for educational purposes, not a substitute for medical advice. Sudden, patchy or unusually rapid hair loss should be assessed by a healthcare professional.
Source notes
- [1] van Zuuren EJ, Fedorowicz Z, Schoones J. Interventions for female pattern hair loss. Cochrane Database of Systematic Reviews 2016, Issue 5, CD007628.
- [2] Kaiser M, Abdin R, Gaumond SI, Issa NT, Jimenez JJ. Treatment of androgenetic alopecia: current guidance and unmet needs. Clinical, Cosmetic and Investigational Dermatology 2023;16:1387–1406. (Summarises Olsen et al. on 393 men over 48 weeks, and Olsen et al. on 31 men over 5 years.)
- [3] Tsuboi R, Ogawa H, Takeda K, et al. A randomized, placebo-controlled trial of 1% topical minoxidil solution in the treatment of androgenetic alopecia in Japanese women. European Journal of Dermatology 2007;17(1):37–44.
- [4] Health Products Regulatory Authority (Ireland). Package leaflet: Regaine for Men Extra Strength 5% w/w cutaneous solution (for men and women).
- [5] Patel P, Nessel TA, Kumar DD. Minoxidil. In: StatPearls. Treasure Island (FL): StatPearls Publishing; last updated 24 February 2023.
- [6] Liang X, Chang Y, Wu H, et al. Efficacy and safety of 5% minoxidil alone, minoxidil plus oral spironolactone, and minoxidil plus microneedling on female pattern hair loss: a prospective, single-center, parallel-group, evaluator-blinded, randomized trial. Frontiers in Medicine 2022;9:905140.
