"i am 140 lb, 29 year old woman. i was prescribed 150 mg of venlafaxine xr. i only took it for 5 days due to the horrendous side effects. i experienced dry mouth, excessive sweating, blurred vision, constipation, and increased heart rate. i wasn&#039;t on it long enough to determine its effectiveness; i wasn&#039;t willing to deal with side effects. my doctor switched me to wellbutrin and i have not experienced any withdrawal symptoms."