Oral vs. topical minoxidil
A comparison of topical minoxidil and low-dose oral minoxidil for hair loss: routes, doses, advantages, adverse effects and monitoring. Informative content; it does not replace individualised medical assessment.
| Feature | MinoxidilView sheet | Oral minoxidilView sheet |
|---|---|---|
| Route of administration | Topical (lotion or foam on the scalp) | Oral (low-dose tablet) |
| Usual form and dose | 2% or 5%, once or twice a day | 0.25-5 mg per day (off-label use) |
| Mechanism of action | Vasodilator and potassium-channel opener; prolongs the hair growth phase | The same mechanism, but systemically |
| Main indications | Androgenetic alopecia; support in other types of hair loss | Androgenetic alopecia and other hair loss, especially when the topical form is not tolerated or adherence is low |
| Main advantage | Local action, with virtually no effects on the rest of the body | Convenience (one dose a day) and better adherence; useful for an extensive scalp area |
| Common side effects | Irritation, itching, scaling or redness of the scalp; contact dermatitis | Hypertrichosis, fluid retention and oedema, palpitations; blood-pressure drop (uncommon at low doses) |
| Unwanted hair (hypertrichosis) | Local only: facial hair if the product touches the skin of the face | Generalised: more visible hair on face, arms and legs |
| Medical monitoring | Does not usually require special checks | Blood pressure, heart rate and oedema should be monitored |
| Initial shedding | A temporary increase in shedding is possible in the first weeks | Also possible at the start of treatment |
| Pregnancy and breastfeeding | Not advised; use only under medical guidance | Contraindicated; use only under medical guidance |
| Level of evidence | High | Moderate-high and growing |
Low-dose oral minoxidil is often used off-label and requires medical prescription and follow-up. The choice between the topical and oral route should always be made on an individual basis.