Snippet from the abstract:
OBJECTIVE: To determine the degree of improvement in semen parameters after finasteride discontinuation.
DESIGN: A prospective database of men presenting for a fertility evaluation was analyzed for semen and hormone parameters before and after discontinuation of finasteride.
SETTING: A male infertility specialty clinic.
PATIENT(S): Men presenting for fertility evaluation from 2008-2012 on finasteride.
In a study of 4400 men over a 57.4 month time span, sperm counts were performed after finasteride was discontinued. There was an 11.6-fold increase in sperm count on the discontinued use of finasteride (Propecia at the 1mg dose), suggesting that the drug brought down the sperm count in most men.
In men with severe oligospermia (low sperm count), the counts went up when the drug was stopped. No men had decreases in sperm count in the study. This suggests that individuals on finasteride who are interested in having children, should be aware that there is a risk of reduced sperm counts on the drug.