QUESTION: Hi Dr Jones. I went to give blood today and being on propecia realized that I was unable to. I have always given blood quite regularly so it came as a bit of a shock. Is it true that as long as I am on propecia I will be unable to give blood?
Answer: Hello. Yes unfortunately patients on propecia are not eligible as blood donors. The reason is that there is a risk that the blood will be given to a pregnant female, which in turn could cause harm to the foetus. You could consider going off propecia for 2 weeks before giving blood, it shouldn’t have much of an effect on your hair and you can resume treatment after words.