Finasteride and Fertility: Semen Parameters, Sperm Quality, Evidence Review
Medically reviewed by [Reviewer Name, MD] | Last reviewed: August 2026 | Editorial policy
DHT plays a role in spermatogenesis and the male reproductive tract, which raises the question of whether finasteride’s 5α-reductase inhibition affects male fertility. The published evidence consistently shows modest semen parameter changes in most men that reverse upon drug cessation, though individual case reports of more severe impacts exist.
Key Research
| Study | Population | Findings |
|---|---|---|
| Amory JK, et al. 2003 (J Urology) | 20 healthy men; crossover trial; fin 1 mg for 48 weeks | Mean sperm count unchanged; semen volume and sperm motility showed small statistically insignificant changes; all parameters returned to baseline after discontinuation |
| Liu KE & Bhatt A, et al. systematic review 2014 | Case reports and cohort studies | Subset of infertile men presenting to fertility clinics while on finasteride showed low sperm count or azoospermia; most improved after stopping |
| Kiguradze T, et al. 2017 (PeerJ) | Nested case-control; US insurance database, 11,909 men | Finasteride use associated with persistent sexual dysfunction in younger men in a pharmacoepidemiological signal analysis |
WHO Normal Reference Ranges in Context
The current WHO 2021 lower reference limits for semen parameters provide context for evaluating study findings:
| Parameter | WHO 2021 Lower Reference |
|---|---|
| Sperm concentration | ≥16 million/mL |
| Total sperm count | ≥39 million/ejaculate |
| Progressive motility | ≥30% |
| Normal morphology | ≥4% |
Clinical Guidance Summary
- Most men taking finasteride 1 mg do not experience clinically significant semen parameter changes
- Men planning conception should discuss temporary discontinuation with their prescribing physician; recovery of semen parameters after stopping is typically expected within 3–6 months
- Men experiencing infertility while on finasteride should have semen analysis performed and consider specialist consultation
Sources
- Amory JK, et al. “The effect of 5α-reductase inhibition with dutasteride and finasteride on semen parameters and serum hormones in healthy men.” J Urol. 2007;177(4):1233–1237.
- World Health Organization. WHO laboratory manual for the examination and processing of human semen. 6th ed. 2021.