my teenage son developed servere ocd, intrusive thoughts and tics following a throat infection 2 yrs ago, intially he did well but his tics and intrusive thoghts are at times very debilitating and servere particularly when he gets any infection, currently taking rispiradone and sertraline he is finding life and school very hard, his pschiatrist wants to switch to ariprazole should it help, he is worried about wt gain as this as been a problem with rispiradone