Fifty experts from nine countries, each having treated more than ten children with low-dose oral minoxidil, completed a three-round Delphi process; 84 of 127 statements reached consensus. The use is off-label, and this is expert agreement rather than trial evidence.
The panel supported its use from age 4 to under 12 for hair follicle miniaturisation and hair cycle disorders, for hair shaft disorders, and as an adjunct in selected scarring alopecias. Reasons to prefer it over topical minoxidil included poor tolerability, difficulty applying it, inadequate response, sensory sensitivities and the risk to pets. Two dosing approaches were endorsed: fixed bands matched to tablet strengths (about 0.25–0.625 mg under 20 kg, 1.25 mg at 20–40 kg, 1.875 mg over 40 kg) or 0.01–0.02 mg/kg/day to start, increasing by 50–100% with review every 3–6 months. Pericardial effusion or tamponade and phaeochromocytoma were listed as contraindications. The experts did not consider routine baseline tests or blood pressure checks necessary in low-risk children.
The value here is consistency. Many clinicians already prescribe it to children without a shared starting dose; this gives one. Hypertrichosis is the side-effect families notice most, and should be discussed before starting.
- Consider low-dose oral minoxidil in children aged 4 to under 12 when topical minoxidil is not tolerated or not working.
- Start at about 0.01–0.02 mg/kg/day, or use the agreed weight bands, and review every 3–6 months.
- Check for cardiac disease, pericardial effusion and phaeochromocytoma before starting.
- Warn families about facial and body hair growth, the most common side-effect.
- Explain that this is off-label and the guidance is expert consensus, and document the discussion.
Why it matters
Widespread off-label prescribing in children now has a common reference for dose and monitoring.
Don't overread it
Expert consensus on off-label use — it does not establish efficacy or long-term safety in children.
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