Let me clear up a few misconceptions. For one thing, Asperger’s and autism are not forms of mental illness; they are neurodevelopmental disorders or disabilities. Autism is a lifelong condition that manifests before the age of 3; most mental illnesses do not appear until the teen or young adult years. Medications rarely work to curb the symptoms of autism, but they can be indispensable in treating mental illness like obsessive-compulsive disorder, schizophrenia and bipolar disorder. Quoted from the link.