Morphometric-stereological and functional epididymal alterations and a decrease in fertility in rats treated with finasteride and after a 30-day post-treatment recovery period

Finasteride treatment significantly reduces sperm transit time in the epididymis, sperm motility, and fertility parameters. A 30-day post-treatment recovery period was not enough to restore all parameters.


Patrick Vianna Garcia, M.Sc., Mainara Ferreira Barbieri, B.Sc., Juliana Elaine Perobelli, M.Sc., Sílvio Roberto Consonni, M.Sc., Suzana de Fátima Paccola Mesquita, Ph.D., Wilma de Grava Kempinas, Ph.D., Luis Antonio Violin Pereira, M.D., Ph.D.

Vol 97, Issue 6 , Pages 1444-1451



To evaluate morphometric-stereological changes in the epididymal caput, sperm quality, and fertility parameters in rats treated with finasteride and after a 30-day post-treatment recovery period.


Experimental study in a research laboratory.


Reproductive biology research laboratory.


Male and female Sprague Dawley rats.


Treatment with finasteride (5 mg/kg/day) for 56 days followed by 30 days without treatment.

Main Outcome Measure(s):

Serum hormone analyses, morphometric-stereological and ultrastructural evaluation of the epididymal caput, sperm transit time, natural mating, in utero insemination, sperm membrane integrity, and fertility parameters.


Serum dihydrotestosterone levels in the finasteride group decreased by ∼40% compared with that of control rats. Ultrastructural analysis revealed significant reductions in several morphometric-stereological parameters of the epididymal caput. All parameters recovered significantly in the post-treatment period. There was no alteration in daily sperm production in the finasteride group. However, significant reductions in sperm transit time, motility, sperm membrane integrity, and fertility parameters were observed in rats treated with finasteride.


Treatment with finasteride caused morphometric-stereological and functional changes in the epididymis and in sperm function that led to a reduction in fertility parameters. A 30-day post-treatment recovery period was insufficient to restore normal sperm motility, sperm transit time, and some fertility parameters.

Read the full text at:

Please sign in or register for FREE

Your Fertility and Sterility Dialog login information is not the same as your ASRM or EES credentials. Users must create a separate account to comment or interact on the Dialog.