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Minoxidil for patchy alopecia areata: systematic review and meta-analysis
P C B Freire1, R Riera2, A L C Martimbianco3
1Department of Health Informatics, Universidade Federal de São Paulo, São Paulo, Brazil.
Summary
Minoxidil effectively treats alopecia areata (AA), a common immune disease causing hair loss. Studies show 5% minoxidil is safe and effective for patchy AA in children and adults, though more research is needed.
Area of Science:
- Dermatology
- Immunology
- Genetics
Background:
- Alopecia areata (AA) is a common immune and polygenic inflammatory disease causing varied hair loss.
- Affecting 0.2% of the global population, AA presents treatment uncertainties.
- Minoxidil is a promising intervention for patchy AA in all age groups.
Purpose of the Study:
- To evaluate the effectiveness and safety of over 80 interventions for alopecia areata.
- Specifically assessing minoxidil as a potential treatment for patchy AA.
Main Methods:
- Extensive literature search for randomized clinical trials (RCTs) on AA interventions.
- Qualitative and quantitative evaluation of RCTs based on a predefined protocol and seven specific outcomes.
Main Results:
- Meta-analysis showed 5% minoxidil significantly outperformed placebo for patchy AA in children and adults (RR 8.37).
- Evidence quality for minoxidil's efficacy was moderate.
- No severe adverse events were reported during the trials.
Conclusions:
- 5% minoxidil is an effective and safe treatment for patchy alopecia areata.
- Current evidence, while promising, is based on limited sample sizes and moderate quality.
- Further high-quality studies with larger cohorts and longer follow-up are necessary.
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