70.* >50% of these children have moderate to profound mental retardation.* There appears to be a correlation between severity of mental retardation, absence of speech & epilepsy- in autism. Treatment of AutismBehaviour TheoryPsychotherapyPharmacotherapy* Development of a regular routine with as few changes as possible.* Structured classroom training, aiming at learning new material & maintenance of acquired learning.* Positive reinforcements to teach self- care skills.* Speech therapy and/or sign language teaching.* Behavioral techniques to encourage interpersonal interactions.* Parental counseling &* supportive psychotherapy can be very useful in allaying parental anxiety and guilt, and helping their active involvement in therapy.* However, overstimulation of child should be avoided during treatment.* Halo peridot decreases dopamine levels in brain, decreases hyperactivity & behavioral symptoms.* Risperidone, for treatment of autism in children aged 5 and above.* Anticonvulsants are used for the treatment of generalized or other seizures">