I just started taking this. Picked up the prescription this morning. I read one of the side effects is weight gain. I'm very worried about this. I've worked hard over the last year to lose 40 pounds. I exercise every day (sometimes 2x's a day) and keep myself on a strict diet. My pdoc said she doesn't want me on it long term.

My question: is this a common or potential side effect? Is it true weight gain or water gain/increase hunger like prednisone? If I'm not on it long term and put on weight will the weight come off easily or will I be back to square one?