A Case of Unilateral Idiopathic Gynecomastia Aggravated by Low-Dose Finasteride (1 mg/Day, Propecia)

    May 2004
    계경채, Seo Young Joon, 서기범, 이증훈, 박장규
    TLDR Finasteride may cause breast enlargement in some men.
    Low dose finasteride (1 mg/day, Propecia) was used as a treatment for male androgenetic alopecia, but a case was reported where it aggravated unilateral idiopathic gynecomastia. A 23-year-old man experienced painful enlargement of his right breast two months after starting the treatment. Upon discontinuation of finasteride, the symptoms disappeared after two months. This case highlighted a potential side effect of finasteride in the treatment of hair loss.
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