I just started on Paxil. I am a little nervous because I have never been on it before. I am on 20MG right now for severe anxiety and depression. I have been on Zoloft off and on for about 8 years and didn't have many side effects on it but I didn't feel like it really worked for me. Are there any big side effects with Paxil that I need to look out for? I heard that it causes weight gain which I am panicked about since I am already over weight and want to start losing weight. Is there anything I can do to avoid that weight gain? For most people that gain weight on it is it just a small amount? When I was on Zoloft I either lost weight or maintained since it caused me to lose my appetite. Also on Zoloft I totally lose my sex drive is this common for anti-depressents? Any thoughts would be appreciated as I don't know much about Paxil. My Dr. thought Paxil might be affective for me since I suffer from Social anxiety and GAD and that leads to my depression.