February 2013 in “Journal of The American Academy of Dermatology” Using hair loss drugs finasteride and dutasteride may cause sexual side effects.
October 2023 in “Toxicology and Applied Pharmacology” This study found that finasteride and minoxidil act as hormone disruptors in mice, with finasteride having a more significant association with reproductive injuries, such as damage to the epididymis and reduced semen volume.
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January 1999 in “Drugs” This study found that oral finasteride 1 mg/day promotes hair growth and prevents further hair loss in a significant proportion of men with male pattern hair loss over two years.
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October 1999 in “The Journal of Urology” This study concluded that daily treatment with 1 mg finasteride did not affect spermatogenesis or semen production in young men and had small, reversible effects on prostate volume and serum PSA.
March 2025 in “Daehan saengsik uihak hoeji/Clinical and experimental reproductive medicine” This study found that long-term use of dutasteride in men taking it for androgenetic alopecia may lead to persistent decreases in semen volume and sperm motility, potentially impacting fertility, with significant impairment observed after 17.8 to 20.3 months of treatment.