Adverse effects of finasteride in men treated for benign prostatic hyperplasia and androgenetic alopecia - a literature review
DOI:
https://doi.org/10.12775/JEHS.2025.79.58442Keywords
finasteride, 5-α-reductase inhibitors, benign prostatic hyperplasia, androgenetic alopeciaAbstract
Background Finasteride, a selective inhibitor of the enzyme 5-alpha reductase type II, is extensively utilized in the management of androgenetic alopecia (AGA) and benign prostatic hyperplasia (BPH). By reducing the conversion of testosterone to dihydrotestosterone (DHT), finasteride effectively mitigates the pathophysiological mechanisms underlying these conditions. Despite its proven efficacy, the therapeutic use of finasteride has been associated with a spectrum of adverse effects, particularly in the domains of sexual, neuropsychiatric, and endocrine health. This review aims to comprehensively analyze the incidence, pathophysiology, and clinical management of adverse effects related to finasteride therapy.
Material and methods A comprehensive search of databases, including PubMed and Google Scholar, was conducted using the keywords mentioned below.
Conclusions Finasteride is considered a safe and effective medication for the treatment of androgenetic alopecia and benign prostatic hyperplasia, with a well-documented safety profile. However, its use may be associated with adverse effects, including sexual dysfunction and psychological symptoms, which can impact patient satisfaction and adherence to treatment. Although these side effects are typically reversible upon discontinuation, clinicians should discuss potential risks with patients and implement monitoring strategies to ensure optimal outcomes and patient confidence in therapy.
References
1. Fertig RM, Gamret AC, Darwin E, Gaudi S. Sexual side effects of 5-α-reductase inhibitors finasteride and dutasteride: A comprehensive review. Dermatology Online Journal. 2017;23(11):3. doi:10.5070/D32311037240.
2. Unger JM, Till C, Thompson IM Jr., et al. Long-term consequences of finasteride vs placebo in the Prostate Cancer Prevention Trial. J Natl Cancer Inst. 2016;108(12):djw168. doi:10.1093/jnci/djw168.
3. Amory JK, Wang C, Swerdloff RS, et al. The effect of 5α-reductase inhibition with dutasteride and finasteride on semen parameters and serum hormones in healthy men. J Clin Endocrinol Metab. 2007;92(5):1659–1665. doi:10.1210/jc.2006-2220.
4. Nguyen DD, Marchese M, Cone EB, et al. Investigation of suicidality and psychological adverse events in patients treated with finasteride. JAMA Dermatol. 2020;156(11):1215-1225. doi:10.1001/jamadermatol.2020.3385.
5. Ali AK, Heran BS, Etminan M. Persistent sexual dysfunction and suicidal ideation in young men treated with low-dose finasteride: A pharmacovigilance study. Pharmacotherapy. 2015;35(7):687–695. doi:10.1002/phar.1612.
6. Guo M, Heran BS, Flannigan R, et al. Persistent sexual dysfunction with finasteride 1mg taken for hair loss. Pharmacoepidemiology and Drug Safety. 2016. doi:10.1002/phar.1837.
7. Gur S, Kadowitz PJ, Hellstrom WJG. Effects of 5-alpha reductase inhibitors on erectile function, sexual desire, and ejaculation. Expert Opin Drug Saf. 2013;12(1):81–90. doi:10.1517/14740338.2013.742885.
8. Mysore V. Finasteride and sexual side effects. Indian Dermatol Online J. 2012;3(1):62-65. doi:10.4103/2229-5178.93496.
9. Kiguradze T, Temps WH, Yarnold PR, et al. Persistent erectile dysfunction in men exposed to the 5α-reductase inhibitors, finasteride, or dutasteride. PeerJ. 2017;5:e3020. doi:10.7717/peerj.3020.
10. Haber RS, Gupta AK, Epstein E, et al. Finasteride for androgenetic alopecia is not associated with sexual dysfunction: A survey-based, single-centre, controlled study. J Eur Acad Dermatol Venereol. 2019;33(8):1393–1397. doi:10.1111/jdv.15548.
11. The Finasteride Study Group. The effect of finasteride in men with benign prostatic hyperplasia. N Engl J Med. 1992;327(17):1185-1191. doi:10.1056/NEJM199210223271701.
12. Leyden J, Dunlap F, Miller B, et al. Finasteride in the treatment of men with frontal male pattern hair loss. J Am Acad Dermatol. 1999;40(6):930-937. doi:10.1016/S0190-9622(99)70081-2.
13. Wilton L, Pearce G, Edet E, et al. The safety of finasteride used in benign prostatic hypertrophy: A non-interventional observational cohort study in 14,772 patients. Br J Urol. 1996;78(3):379-384. doi:10.1046/j.1464-410x.1996.00234.x.
14. Kaufman KD, Olsen EA, Whiting D, et al. Finasteride in the treatment of men with androgenetic alopecia. J Am Acad Dermatol. 1998;39(4):578-589. doi:10.1016/S0190-9622(98)70007-6.
15. Vaughan D, Imperato-McGinley J, McConnell J, et al. Long-term (7 to 8-year) experience with finasteride in men with benign prostatic hyperplasia. Urology. 2002;60(6):1040-1044. doi:10.1016/S0090-4295(02)01971-4.
16. Traish AM, Mulgaonkar A, Giordano N. The dark side of 5α-reductase inhibitors’ therapy: Sexual dysfunction, high Gleason grade prostate cancer, and depression. Korean J Urol. 2014;55(6):367-379. doi:10.4111/kju.2014.55.6.367.
17. Laborde E, Brannigan RE. Effect of 1-mg dose of finasteride on spermatogenesis and pregnancy. Androlog. 1999;162:1295–1300. doi:10.1016/j.juro.1999.162.
18. Chiba K, Yamaguchi K, Li F, et al. Finasteride-associated male infertility. Fertil Steril. 2011;95(5):1786.e9-1786.e11. doi:10.1016/j.fertnstert.2010.12.008.
19. Samplaski MK, Lo K, Grober E, Jarvi K. Finasteride use in the male infertility population: Effects on semen and hormone parameters. Fertil Steril. 2013;100(6):1542-1546. doi:10.1016/j.fertnstert.2013.07.2000.
20. Römer B, Gass P. Finasteride-induced depression: New insights into possible pathomechanisms. J Cosmetic Dermatol. 2010;9(4):331-332. doi:10.1111/j.1473-2165.2010.00526.x.
21. Welk B, McArthur E, Ordon M, et al. Association of suicidality and depression with 5α-reductase inhibitors. JAMA Intern Med. 2017;177(5):683-691. doi:10.1001/jamainternmed.2017.0089.
22. Mendell AL, Creighton SD, Wilson HA, et al. Inhibition of 5α-reductase impairs cognitive performance, alters dendritic morphology, and increases tau phosphorylation in the hippocampus of male 3xTg-AD mice. Neuroscience. 2020;429:185-202. doi:10.1016/j.neuroscience.2020.01.011.
23. Garcia-Argibay M, Hiyoshi A, Fall K, et al. Association of 5α-reductase inhibitors with dementia, depression, and suicide. JAMA Netw Open. 2022;5(12):e2248135. doi:10.1001/jamanetworkopen.2022.48135.
24. Welk B, McArthur E, Ordon M, et al. The risk of dementia with the use of 5α-reductase inhibitors. J Neurol Sci. 2017;380:119-124. doi:10.1016/j.jns.2017.05.064.
25. Scardino PT. The prevention of prostate cancer — the dilemma continues. N Engl J Med. 2003;349(3):297-299. doi:10.1056/NEJMe030098.
26. Theoret MR, Ning YM, Zhang JJ, et al. The risks and benefits of 5α-reductase inhibitors for prostate cancer prevention. N Engl J Med. 2011;365(2):97-99. doi:10.1056/NEJMp1106786.
27. MHRA Public Assessment Report. The risk of male breast cancer with finasteride. Medicines and Healthcare products Regulatory Agency. December 2009.
28. Kjærulff TM, Ersbøll AK, Green A, et al. Finasteride use and risk of male breast cancer: a case-control study using individual-level registry data from Denmark, Finland, and Sweden. Cancer Epidemiol Biomarkers Prev. 2019;28(6):1034-1040. doi:10.1158/1055-9965.EPI-18-0904.
29. Bird ST, Brophy JM, Hartzema AG, et al. Male breast cancer and 5-alpha reductase inhibitors, finasteride and dutasteride. J Urol. 2013;189(5):1531-1536. doi:10.1016/j.juro.2013.04.132.
30. Swerdloff RS, Ng JCM. Gynecomastia: Etiology, Diagnosis, and Treatment. 2023 Jan 6. In: Feingold KR, Anawalt B, Blackman MR, Boyce A, Chrousos G, Corpas E, de Herder WW, Dhatariya K, Dungan K, Hofland J, Kalra S, Kaltsas G, Kapoor N, Koch C, Kopp P, Korbonits M, Kovacs CS, Kuohung W, Laferrère B, Levy M, McGee EA, McLachlan R, New M, Purnell J, Sahay R, Shah AS, Singer F, Sperling MA, Stratakis CA, Trence DL, Wilson DP, editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000–. PMID: 25905330.
31. Harrell MB, Ho K, Te AE, et al. An evaluation of the federal adverse events reporting system data on adverse effects of 5-alpha reductase inhibitors. World J Urol. 2020;38(9):2021-2031. doi:10.1007/s00345-020-03314-9.
32. Rossi A, Cantisani C, Scarnò M, et al. Finasteride, 1 mg daily administration on male androgenetic alopecia in different age groups: 10-year follow-up. Dermatol Ther. 2011;24(4):455-461. doi:10.1111/j.1529-8019.2011.01441.x.
33. Hagberg KW, Divan HA, Fang SC, et al. Risk of gynecomastia and breast cancer associated with the use of 5-alpha reductase inhibitors for benign prostatic hyperplasia. Clin Epidemiol. 2017;9:83-91. doi:10.2147/CLEP.S124674.
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Copyright (c) 2025 Adrian Kruk, Aleksandra Dorosz, Agnieszka Skoczeń, Michał Kulesza, Weronika Wawrzynów, Magdalena Maria Jakubowska, Natalia Rutecka, Błażej Kaczmarek, Martyna Miłoś, Agata Kuśnierz-Gibała

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