Topical vs Oral Finasteride: What the Spray Trial Shows and Why US Topicals Are Compounded
A finasteride spray beat placebo in a 24-week European trial and looked similar to tablets. In the US, no topical version is FDA-approved, and the FDA has warned about compounded ones.
By Kymata Health Editorial Published Last checked
This guide
Finasteride- Question
- Is topical finasteride as good as the pill, and is it safer?
- Sources
- 4 cited
- Quick answers
- 2 questions
- Clinician review
- None; sources cited inline
Key takeaways
4 points- Oral finasteride 1 mg is the FDA-approved form, for men only1.
- In a 24-week trial of 458 men, run largely by its developer, finasteride spray added 20.2 hairs in the target area vs 6.7 with placebo, numerically similar to tablets2.
- Side effects with the spray did not differ meaningfully from placebo in that trial2.
- No topical finasteride is FDA-approved; the FDA counted 32 adverse-event reports for compounded topical versions from 2019 to 20243.
The finasteride spray trial
A phase III, double-blind trial at 45 European sites randomized 458 men to finasteride spray, finasteride tablets or placebo for 24 weeks. Target-area hair count rose by 20.2 hairs with the spray vs 6.7 with placebo, and the spray and tablets were numerically similar2. Adverse events with the spray did not differ meaningfully from placebo2. Seven of its ten authors worked for Almirall, the spray's developer2.
The trial lasted 24 weeks, so it cannot show long-term results or rare and persistent side effects2.
Topical finasteride in the US
There is no FDA-approved topical finasteride in the US; the sprays and finasteride-minoxidil mixes sold online are compounded. The FDA says compounded drugs are not evaluated for safety, effectiveness or quality, that finasteride applied to the skin is absorbed into the bloodstream, and that topical products raise the risk of transfer to others, including women3. It received 32 adverse-event reports from 2019 to 2024, including erectile dysfunction, anxiety, depression and suicidal ideation3.
Because finasteride can harm a male fetus, women who are or may be pregnant must avoid exposure1. For the full picture see the finasteride hub.
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- Previous in this topicFinasteride Sexual Side Effects and Post-Finasteride Syndrome: What the Trials, the Label and the Reviews SayIn trials, sexual side effects on finasteride were uncommon and mostly resolved.
- Next in this topicFinasteride: Pills vs Topical, Sexual Side Effects and Pregnancy Rules, by the Trials and the LabelFinasteride 1 mg is the FDA-approved pill for male pattern hair loss, in men only.
- Minoxidil: Topical vs Oral, for Men and Women, by the Trials and the LabelsMinoxidil foam and solution are sold over the counter to regrow scalp hair in men and women.
- Men's Hair Loss: Finasteride, Minoxidil and Laser Caps, by the EvidenceFinasteride and minoxidil are the two FDA-approved drugs for male pattern hair loss, with the largest and longest trials.
- Hair Loss Treatment Online Cost (2026): Finasteride From $6, Telehealth ComparedGeneric finasteride costs $5.83 for 30 tablets at Cost Plus Drugs; online plans run $16–$22/mo (Ro, Hims), combination pills $35/mo and MangoRx Grow (compounded) from $90/mo.
References
Every study and document cited in this guide, numbered as in the text.
Sources
4 sources- 1PROPECIA (finasteride) tablets, film coated: prescribing information. DailyMed, U.S. National Library of Medicine, 2024.
- 2Efficacy and safety of topical finasteride spray solution for male androgenetic alopecia: a phase III, randomized, controlled clinical trial. J Eur Acad Dermatol Venereol, 2022. PMID 34634163
- 3FDA alerts health care providers, compounders and consumers of potential risks associated with compounded topical finasteride products. U.S. Food and Drug Administration, 2025.
- 4Finasteride in the treatment of men with androgenetic alopecia. Finasteride Male Pattern Hair Loss Study Group. J Am Acad Dermatol, 1998. PMID 9777765
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