Paliperidone
"My 8 year old son was put on Invega 3 mg and then moved up to 6 mgs a day. About 1 1/2 months ago after gaining too much weight on risperdone. He gets the dosage on time daily but since starting Invega he has had the worse uncontrollable muscle spasms/twitches. He is constantly twitching his arms, neck and head without knowing he is doing it. Also he has started making vocal noises (random humming) without noticing he is doing it.  I was really hoping the Invega would work but I think in our case the side effects are too much to accept so he will be switching again today."