We have generic here for Propecia, and on the instructions they say that on propecia we should use a condom during intercourse. It seems that it is pretty new, and there is nothing on the intructions of Propecia. My first kid is a boy and was born while I was using propecia. It seems normal.
Is there really a risk ? What is the position of Merck on it ? It seems that we have different opinion and it is quite difficult to have an opinion. Why this warning has appeared ?
Is there a proof somewhere that a newborn has trouble while the father was on propecia ? Thank you for your answer.
There must be thousands of boys born whose father’s took Propecia (finasteride) during conception.
We know that in the womb during the first 3 months, if a woman is exposed to sizable doses of finasteride it can alter the sexual development of the fetus. If the man was taking it, however, there is no evidence that the drug will cross to the woman and into the fetus. I know that the formal concerns are published and they are unfortunately more a statement of what the lawyers want the drug companies to say rather than a scientific observable risk.
I haven’t seen the Propecia packaging that mentions using a condom during sex, but I will also refer you to this letter we received from Merck about this very issue a few years back. In part, it states that “no significant mechanism-based or non-mechanism-based teratologic effects have been observed in infants born to women exposed to finasteride via semen during pregnancy.”