"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."