I was involved in clinical research for new drug many years ago. MSD was one where I have been worked.
The problems ( side effects) appears during the treatment AND after the treatment stopped. It is urgent to perfom a blood test if you are taken propecia . You have to request the size of the FSH, LH and prolactine (hormons). Is is very important.
After that, send this forum the resoults and I will be very plased to explain where is the problem with this drug.
I am a Biochemist.