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Evidence summaries

Finasteride for Hirsutism

Finasteride may be effective for hirsutism compared with placebo. Level of evidence: "C"

A Cochrane review [Abstract] 2 assessed different medical interventions for hirsutism. Finasteride 5mg to 7.5 mg daily was more effective than placebo in reducing Ferriman-Gallwey scores (score 0 to 36) (MD -5.73, 95% CI -6.87 to -4.58). Spironolactone showed similar effectiveness to finasteride (MD 1.49, 95% CI -0.58 to 3.56 and MD 0.40, 95% CI -1.18 to 1.98; 2 trials). However, results were inconsisntent when comparing finasteride with flutamide.

A topic in Clinical Evidence 1 summarizes the results of 2 RCTs. The first RCT (n=24 women, 14 with polycystic ovary syndrome) found that finasteride 5 mg daily significantly reduced hirsutism compared with placebo (Ferriman-Gallwey score 6.7 vs 10.6, p<0.01). The second RCT (n=40, 21 with polycystic ovary syndrome) found that finasteride, spironolactone, and flutamide reduced hirsutism compared with placebo (p<0.01 for all treatments).

A meta-analysis 3 assessing treatment options for hirsutism included 43 trials. Antiandrogen monotherapy with flutamide, finasteride, and spironolactone were each superior to placebo but similar to each other in efficacy.

Comment: The quality of evidence is downgraded by study quality and by sparse data.

    References

    • Al-Inamy H. What are the effects of treatments? Polycystic ovary syndrome. Clinical Evidence 2005;13:2442-2448.
    • van Zuuren EJ, Fedorowicz Z, Carter B et al. Interventions for hirsutism (excluding laser and photoepilation therapy alone). Cochrane Database Syst Rev 2015;(4):CD010334. [PubMed]
    • Barrionuevo P, Nabhan M, Altayar O et al. Treatment Options for Hirsutism: A Systematic Review and Network Meta-Analysis. J Clin Endocrinol Metab 2018;103(4):1258-1264. [PubMed]

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