Minoxidil, and the early shedding phase

Minoxidil is the most widely used topical treatment for hair loss, and one of the few that works for both men and women. It also has a quirk that catches people out: a phase of increased shedding soon after starting, which is usually a sign it is working.

Here is how it works and what to expect.

How minoxidil works

Minoxidil is applied to the scalp, usually as a 2% or 5% solution or foam, once or twice daily depending on the product. It does not block DHT. Instead it acts directly on the follicle, improving local blood flow and, more importantly, extending the active growing phase of the hair cycle so that follicles spend more time producing hair and less time resting.

Because it is applied to the scalp rather than swallowed, it has very little effect on the rest of the body, which is part of why it suits people who would rather avoid a systemic hormonal treatment.

It comes as a liquid solution or a foam. The foam dries faster, leaves less residue, and tends to irritate the scalp less, so many people find it easier to live with day to day. The strength and how often you apply it are matched to whether you are a man or a woman and to how your scalp tolerates it.

The early shedding phase

In the first two to eight weeks, many people notice they are shedding more hair, not less. This is unsettling if you do not know it is coming, and it is the point at which some people abandon treatment, exactly when they should keep going.

What is happening is that minoxidil pushes resting follicles to move into a new growth phase. As the new hair starts to grow, it dislodges the old resting hair, so the old hairs come out together. This synchronised shed, sometimes nicknamed the dread shed, is a sign the follicles are responding. It settles within a couple of months, after which the new growth comes through.

Sticking with it

Minoxidil rewards persistence. Visible benefit usually takes three to six months and is judged at around twelve. Like all pattern-hair-loss treatments, it works only while you use it, and stopping leads the gained hair to fall back over the following months.

Applying it consistently to a dry scalp and letting it absorb is the main thing that determines whether it works, so it suits people who can build it into a daily routine.

Side effects to know about

Minoxidil is generally well tolerated. The most common issues are local:

• Scalp irritation, dryness or itch, sometimes from the alcohol or propylene glycol in solution forms. A foam formulation or a different base often solves this.

• Unwanted hair growth on areas the product runs onto, such as the forehead or, in women, the face. Careful application and washing your hands after use reduces this.

• Rarely, light-headedness or palpitations, which warrant a review.

There is also a low-dose oral form of minoxidil used off-label for hair loss in some settings, which would be a matter for individual clinical discussion rather than a default.

This may not be right for you if

Topical minoxidil may not suit you if you find a twice-daily application hard to keep up, if your scalp reacts badly even to the foam, or if you are looking for a single treatment to do everything, since for many people it works best alongside an oral DHT-blocker rather than alone.

The honest summary

Minoxidil extends the growth phase of the follicle, works for men and women, and commonly causes a temporary shed in the first weeks that signals it is taking effect. It needs consistent use and time. A short assessment with one of our doctors will set out whether minoxidil alone or as part of a combination is the better fit for you.

Ready to start?

If you want to move from reading to acting, the next step is a short, confidential assessment with one of our doctors.

Begin your assessment at this link. Online or in person at Westfield London.