Is it safe for a man using Propecia® to have sexual intercourse with his pregnant wife?
Yes, it is safe for a man using Propecia® to have sex with his pregnant wife. The pregnant woman must not ingest the pills, or even handle the actual pills, or any liquid form of finasteride during her pregnancy, because Propecia® is easily absorbed through the skin. Propecia® could potentially harm a male fetus, especially if taken during the third trimester of pregnancy when the sexual organs are developing. No birth defects have been identified from sexual intercourse when the man is taking oral Propecia®. The amount of finasteride (Propecia®) found in the semen of a male who is taking this medication is minute. It is estimated that over a pint of semen would be necessary daily during the third trimester to produce even the smallest chance of a sexual developmental problem. (This amount far exceeds the imagination, much less the probability!
