What is oral minoxidil?
Minoxidil was originally a blood pressure drug whose most striking side effect - increased hair growth - turned it into a hair loss treatment. Taken orally at low dose it is a convenient alternative to the topical solution, since daily application is no longer needed.
This information is for research and educational purposes only. No medical advice.
How it works
Minoxidil widens blood vessels and improves blood flow to the hair follicles, supports the energy supply of follicle cells and prolongs the growth phase (anagen) of the hair. The exact mechanism is not fully understood, but the effect is well documented.
Use and dosing
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What the research shows
The review by Randolph & Tosti (J Am Acad Dermatol, 2021) summarizes the data on low-dose oral minoxidil: effective in androgenetic alopecia and other hair loss types, with a good safety profile at low dose.
Side effects
- Systemic hypertrichosis (increased body hair) - the most common side effect.
- Drop in blood pressure, faster pulse, occasional fluid retention.
- Headache, rarely ankle edema.
- Caution with pre-existing cardiovascular conditions.
Storage
Store dry and cool, protected from light. Out of reach of children.