I agree with @elbanditoroso (again). Nausea. Some medication can leave me feeling very sick for a couple of hours after I take it.
Other side effects I hate and am not prepared to live with, are fogginess and loss of libido. I took a drug I was prescribed and I couldn’t think straight. I felt vague constantly.
The same drug killed my libido. I have a very healthy sex drive and suddenly the last thing I wanted was sex and if I decided to go ahead and have sex anyway – no orgasm. Couldn’t get there. I went back to the doc and told him what to do with his drug.