One of the most common side effects of psychiatric drugs is violent outbursts and thoughts of suicide … the Columbine High School shooters were, of course, on psychiatric drugs at the time they shot their classmates in 1999. Suicidal tendencies and violent, destructive thoughts are some of the admitted behavioral side effects of mind-altering prescription medications."
Adam Lanza ( see photo ) apparently had Asperger's syndrome. There are no medications that specifically treat Asperger's syndrome. Some medications may improve specific symptoms ~ such as anxiety, depression or hyperactivity ~ that can occur in many children with Asperger's syndrome. Examples include drugs such as fluvoxamine (Luvox) ~ which may be used to treat depression or to help control repetitive behaviors. Possible side effects include restlessness and agitation. http://www.mayoclinic.com/health/aspergers-syndrome/DS00551/DSECTION=treatments-and-drugs
Please note that Luvox is a drug that is 8.4 times more likely to be associated with violence than other drugs.