Can anyone tell me if they had side effects on Effexor? My dr just changed my medication from Wellbutrin 300 mgs to Effexor 75mg then on 4th-150mgs. I have read a lot about weight gain & sexual side effects ... I have already gained 50 lbs on Wellbutrin & can't afford anymore weight gain &I definitely don't want a problem reaching an orgasm either. Has anyone who has been on this had those problems? Please share your experience with me! I am hoping this switch won't be bad! Thanks!