I was prescibed prednisone for serious sinus issues; 60 mgs. for 5 days and gradually tapering off over 14 days total. About 1/2 way through I began feeling deeply dipressed and had quick weight gain. Since I had quit smoking only 8 weeks previous to this, I had already gained some weight but felt I had my eating back under control. I had also been using Zyban to help me through the quitting smoking but had stopped just a day or 2 before starting this prednisone regimen. At the thime, I thought my depression was a result of the weight gain which I blamed on the non-smoking/metabolism shift(?). Never the less, I was a mess; crying all the time, not wanting to be around anyone, exhausted. I had such an argument with my daughter and husband, I ran out and bought cigarettes and smoked! Stupid, I know but I was definately out of control. As the days went by and the depression got worse I decided to check the side effects for prednisone. Could this REALLY be a result of the prednisone? I've been off it now for 10 days and I still don't feel much better yet. I don't seem to be still gaining weight but I am still depressed. Does anyone know how long it takes for this to be totally out of your system? Any info would be greatly appreciated