October 2015 in “Digital Library of Theses and Dissertations (Universidade de São Paulo)” This study observed smaller reductions in PSA levels in men under 40 taking finasteride 1mg/day compared to older age groups, without changes in testosterone levels.
October 2025 in “International Journal of Social health” This systematic review reported that among men taking finasteride for benign prostatic hyperplasia, total PSA levels decreased by 30% to 50%, and free PSA by up to 45%, with reductions in prostate volume and PSA density observed as well.
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January 2000 in “The Journal of clinical endocrinology and metabolism/Journal of clinical endocrinology & metabolism” This study found that serum PSA levels are higher in hirsute women and can be significantly reduced by antiandrogen treatment, suggesting PSA as a marker of androgen action in females.
March 2009 in “The Journal of Urology” Low dose finasteride causes only minor changes in PSA levels in men over 50 with BPH.
April 2007 in “Nature Clinical Practice Urology” Finasteride lowers PSA levels about the same whether taken at 1 mg or 5 mg daily.