I was on Cymbalta when I started Phen and hated it. I didn't gain any weight on it but it made me soo tired, and being on Phen for the first time ever, I was still taking 2 hour naps every day. My doctor switched me to welbutrin andI love it! It has the lowest risk of weight gain, tiredness, and sexual side effects. I don't know how long you have been on it, but the sexual side effects on cymbalta was awful... well for my husband any way
