Dr. Mahdiye Nobakht
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Minoxidil for hair loss: how to use it, common questions and what to expect

Dr. Mahdiye Nobakht · 25 October 2026 · 4 min read

Dr. Nobakht has treated her own hair loss with minoxidil too, and has shared the journey on Instagram. This article collects the questions that you and our patients ask most along the way.

How does minoxidil work?

Minoxidil lengthens the hair's growth phase and helps thin hairs become thicker. To work, it has to be converted inside the hair follicle into its active form, minoxidil sulfate — a job done by an enzyme called SULT1A1. People have different amounts of this enzyme, which is one reason minoxidil doesn't work equally well for everyone.

What does the evidence say?

A 2016 Cochrane systematic review of 47 clinical trials on female pattern hair loss found that roughly twice as many women using topical minoxidil reported moderate to marked regrowth as those on placebo, with side effects not significantly more common than placebo.

Patience: the most important part

One of the first questions we ask before starting treatment is: "Do you really have the patience for this?"

  • Minoxidil doesn't work miracles in a few weeks; the first changes usually take several months.
  • Some people shed more in the first weeks and months and think it isn't working — but this can be part of the normal start of treatment.
  • Many stop before the medicine has had a chance to work. With hair loss, results usually belong to those who keep going.

Why doesn't it work the same for everyone?

  • Genetics differ: some people have more of the enzymes that activate minoxidil and respond better.
  • Not all hair loss is alike: minoxidil works much better for hereditary (androgenetic) hair loss than for some other types.
  • Timing matters: the healthier the follicles, the better the chance of a response.
  • Irregular use or stopping too early is one of the most common reasons for no result.
  • Sometimes minoxidil alone isn't enough, and adding treatments such as microneedling, finasteride or PRP — as your doctor decides — improves results. In one randomised study, weekly microneedling plus minoxidil worked better than minoxidil alone.

Start early

In Dr. Nobakht's own treatment, the area where she started earlier is now full of new baby hairs, while the front, where she started later, is still thinner. Hereditary hair loss doesn't wait; the later treatment starts, the more follicles weaken. But before any treatment, find the cause first — not all hair loss is hereditary.

Common questions

  • After applying minoxidil, do I have to wash my hair in the morning? No. About 3–4 hours after applying, most of it has been absorbed into the scalp; washing isn't required.
  • Can I use a hair-dryer? Yes, 3–4 hours after applying. Just don't aim very hot air straight at the scalp.
  • Can I dye my hair? Yes. Skip minoxidil the day before and the day after dyeing so the scalp gets less irritated.
  • Wet or dry hair? It doesn't make much difference. A slightly damp scalp may absorb it a little better, but it doesn't change the final result in any important way.
  • Can I use hair oil or serum? Yes — for example an oil treatment for roots and lengths once a week — but always 3–4 hours after minoxidil.
  • Can I exercise afterwards? Better to postpone heavy exercise by a few hours, since sweat may reduce absorption.

Side effects and caution

  • Itching, dryness or redness of the scalp are common.
  • If they're severe, or you get palpitations, chest pain, dizziness or swollen hands or feet, stop using it and tell your doctor.
Don't start or stop any medicine, supplement or treatment without talking to a doctor. In pregnancy and while breastfeeding, treatment should be adjusted by your doctor for that period.

References

This article is for general information only and isn't a substitute for a medical consultation. Talk to a doctor before making decisions about your treatment.

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