... drug caused large weight gain until doing research. I was taking 150mgs for mood swings. Have weaned down gradually and took my last one last night. Is it hard to get the weight off? Also, I have leg swelling which I did not know was a side effect either. Will that go away after stopping it. I wish I had never taken this drug. I was always so tired and could spend hours in bed and had no idea why. Any help would be greatly appreciated. PH