“…Hyperactivity and attention disorders in children with PDD have been targeted by psychostimulants (e.g., methylphenidate), atypical antipsychotics (e.g., risperidone, olanzapine), and alpha agonists (e.g., guanfacine, clonidine) (Aman, 2004). Aggressive or self-injurious behavior has been predominantly targeted by both typical and atypical antipsychotic medications (e.g., haloperidol, risperidone) (Chez et al, 2004). For many of these compounds, controlled, large-scale, long-term studies are not available, making it difficult to reach concrete conclusions on their efficacy and tolerability in treating PDD.…”