I have been on effexor for four months now, In that time ive gained 6 kgs, feel bloated and full all the time, and have NO sex drive at all. I spoke to my doctor about this, and she assured me the weight gain has nothing to do with effexor, she made feel like it was all in my head. I decided to take myself off the medicine, i halved my dosage for a week, then stopped it all together, i have gone back on prozac which is what i was taking before effexor..I'm experiencing brain wobbles, fuzzy sounds in my ears,find it hard to sleep, and yesterday uncontrollable crying for no reason, feelings of utter rage, and suicidal thoughts. Im feeling a little brighter today (so far). How long do the side effect last?? And is weight gain a common side effect? My doctor swore black and blue that she had never come across a person who gained weight, and that it was more common to loose it on effexor. I'm a recovering bulimic so weight gain is a very scary thing for me, i wish it wasnt but it is..