Is your doctor aware of your anorexia? Effexor seldom has weight gain side effects - in fact it often results in weight loss - which may make you happy but it will not make you HEALTHY to lose anymore weight. I was on Effexor for 7 years and never gained a pound - if you read the product enclosure you will see all the side effect information. Effexor does have a pretty high percentage of sexual dysfuntion (i.e. inability to orgasm) as a side effect, but each person reacts differently to medication. It was very helpful for my depression - out of all the 25 or so combinations and medications I have been on it was the most helpful for my depression. Please make sure you talk with your doctor about your weight concerns. Best of luck and try to eat something.