How long does minoxidil take to work? A month-by-month guide
Most people expect too much too soon from minoxidil. Hair grows about a centimetre a month, and the follicles it acts on need time to change. The British Association of Dermatologists advises using it for at least six months, and possibly up to twelve, before deciding whether it’s working. Here’s roughly what that year looks like.
Why it takes so long
Minoxidil works through the hair’s own growth cycle. It wakes resting follicles sooner and keeps growing hairs going for longer. But a hair that starts growing today is only a few millimetres long a fortnight later, and the first new hairs are fine and pale. It takes months before they’re long and thick enough to change what you see in the mirror. There’s more on this in how minoxidil works.
Month by month
| When | What’s usually happening |
|---|---|
| Weeks 1 to 2 | Nothing visible yet. Some people notice a slightly dry or itchy scalp while they get used to it. |
| Weeks 2 to 8 | The shed. Many people lose more hair than usual, often most noticeably around weeks four to six. These are resting hairs being pushed out by new growth. |
| Months 2 to 4 | The shed settles. Short, soft, fine hairs may appear in the thinning area. They’re easy to miss without photos. |
| Months 4 to 6 | Some of those fine hairs start to thicken and darken. Many people see the first real difference in photos around now, though not everyone does. |
| Months 6 to 12 | The main stretch. If minoxidil is going to work for you, this is usually when it’s clearest, and it’s the fair point to judge. |
| After a year | Results tend to level off. Carrying on is about keeping what you’ve gained. |
These are typical ranges, not promises. Some people see a change sooner, some later, and minoxidil doesn’t work for everyone.
Men and women
For men, most research has measured hair on the top and crown of the head, where the effect tends to be strongest. Results at a receding hairline are usually more modest. Women tend to notice change along the parting first. Women shouldn’t use minoxidil if pregnant, trying for a baby or breastfeeding.
How to tell if it’s working
You see your own head every day, so slow change is almost impossible to spot in the mirror. Photos solve that.
- Take a set before your first application: the top of your head, the crown and the front hairline.
- Repeat once a month in the same room, light and angle. Soft daylight from a window is ideal, and the British weather usually obliges.
- Keep your hair dry and styled the same way each time, and part it in the same place.
- Compare month six with day one, not month six with month five.
Our free handbook includes a printable twelve-month photo tracker.
Things that slow results down
- Missed applications. Once or twice a week adds up over six months.
- Applying it to your hair instead of your scalp. It needs to reach the skin. See how to apply minoxidil.
- Using more than the recommended amount. It doesn’t speed anything up and is more likely to irritate.
- Washing it off too soon. Leave it on for about four hours before washing your hair or going swimming.
- Stopping during the shed, which is when many people give up, just as it’s starting to work.
When to stop and get advice
If you’ve used it properly for a year and see no change, it’s reasonable to conclude it isn’t working for you and talk to a GP or pharmacist about other options. Stop straight away and get medical advice if you have chest pain, a fast or irregular heartbeat, feel faint or dizzy, put on weight suddenly, or notice swollen hands or feet. For urgent advice, call NHS 111.
Starting out? Our free Thinning Hair Handbook covers why hair thins, when to see your GP, how minoxidil works, how to apply it and what to expect month by month. It comes with a printable photo tracker.
This is general information, not medical advice. If you’re not sure whether something is right for you, speak to your GP or a pharmacist.
Sources: British Association of Dermatologists: Male pattern hair loss (leaflet); British Association of Dermatologists: Female pattern hair loss (leaflet); NHS: Hair loss.
