What is the side effect of taking "degraded" Effexor (or any other meds for the matter)? When he didn't realized that he was taking 10-11 months old prescription of Effexor XR 75mg (3 a day, all taken at once) this was his typical prescription for a year by now. He took this old Effexor for 3 weeks, and ran out for 2 days. Then he did something drastic. I wanted to know if there some adverse side effect that would affect his psychology (he has mental Illness- Schizophrenia: negative Type. The kind where you would have delusions).