autism
"My son has high functioning autism, obsessive compulsive disorder, aggression disorder, and sensory issues.  He was diagnosed at age 3.  He started Risperidone soon after his diagnosis. It worked wonders for 6 months or so.  His behaviors and meltdowns were better but it did not help with the OCD.  After 3 months we had to increase the dose and his symptoms started to get worse gradually.  Then at 6 months he started to tell us he had ants crawling on him and his heart was beeping.  He went through heart tests and they were fine.  The doctor said that the medicine was causing him to see things and maybe have anxiety to have rapid heart rate.  He was taken off and put on Prozac which didn't help and now he's on Zoloft and Abilify which aren't doing anything."