Answer first
Some people shed more hair in the first weeks of using minoxidil. A common explanation is that resting hairs are pushed out as follicles move into a new growth phase. It is usually temporary. If shedding is heavy, lasts beyond a few months or comes with irritation, talk to your consultant or a doctor.
Why it happens
Research describes minoxidil shortening the resting phase, so old hairs fall as new ones start.
What to do
Keep a photo diary, be gentle when washing, and ask for advice if you are worried.
Questions
Should I stop?
Ask before stopping.
How long does it last?
Often a few weeks; it varies.
Studies mentioned
These studies looked at ingredients or general approaches. None of them tested our treatments or products, so they are background, not proof.
- Messenger AG et al. (2004). Minoxidil: mechanisms of action on hair growth. Br J Dermatol 150(2):186-94.Narrative review (mechanism). Topical minoxidil shortens telogen and pushes resting follicles into anagen in animal studies, may prolong anagen and enlarge follicles; the potassium-channel mechanism remains unproven.PubMed 14996087doi:10.1111/j.1365-2133.2004.05785.x