finasteride · Medicine question

Is Propecia (finasteride) contraindicated in men already taking Proscar or another 5-alpha-reductase inhibitor?

Name: Is Propecia (finasteride) contraindicated in men already taking Proscar or another 5-alpha-reductase inhibitor?
Published: 2026-11-08T01:50:38.449Z

iatroX medicinesPublished 8 November 2026

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Yes—Propecia (finasteride) should not be taken by men already taking Proscar (finasteride 5 mg) or any other 5-alpha-reductase inhibitor for benign prostatic hyperplasia or any other condition.

Sources for this answer

Propecia 1mg tabletsOrganon Pharma (UK) Limited · emc · SmPC §4.3 Contraindications · Version 26Document updated 14 July 2026

Sources checked 8 November 2026

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