I don't understand why this is happening. When I took the 20 mg (about 4 weeks), I gained over 10 lbs and on 10 mg the weight is falling off so fast (and appetite loss)! I'm very happy about this, but I was feeling happier on 20 mg and am not much happier on the 10 mg. I'm at an impass here! I want to feel better, but don't want to gain weight doing it!