What could long term Recreational Benadryl abuse do to you?

Question

I'm talking between 8 to 16 pills in one day, for several weeks. I'm not referring to myself, by the way. I have a friend who has been doing this for several months now, and he says he's fine- just stutters and gets tongue-tied occasionally when he talks. I told him it has to be messing his brain and heart up, or will eventually. Can I get a qualified medical opinion, though?

Answer 1

His body will grow accustomed to them and he will need them to not be hyper.