Janna, it was the Lithium that sent Lucas from 100 lbs. to 150 and he gained every month until we cut it out. You may want to try Topomax with it, but Lithium is a weight gainer. Our psychiatrist once showed me a chart of the five biggest weight gaining medications. If I recall, it was the first atypical antipsycotic that came out (I forget it's name--not used much anymore), Risperdal, Zyprexa, Depakote and Lithium. A friend of mine takes Lithium and she's enourmous. Lucas is still a big boy. He hasn't lost the weight. He's only gained about five pounds since stopping Lithium three years ago, he's grown about six inches, and he's STILL overweight. The poor kid used to have trouble walking. That was one big reason I wanted another opinion. I didn't feel he had bipolar but may not have been as proactive if he hadn't blown up so big!
