Treatment of Autism and Intellectual Developmental Disorder with Risperidone

Introduction to Risperidone Treatment

Risperidone typically shows positive effects on behaviors in autism and intellectual developmental disorder (IDD) within 2 weeks of initiation or dose adjustment, as recommended by the American Academy of Child and Adolescent Psychiatry 1
The American Academy of Child and Adolescent Psychiatry suggests that the positive behavioral changes observed in the first 2 weeks can be maintained long-term, as demonstrated in 48-week extension studies 1
Children with IDD may be more sensitive to medication side effects, warranting careful dose adjustments, according to the American Academy of Child and Adolescent Psychiatry 1

Risperidone has demonstrated effectiveness in improving irritability and aggression, primary target symptoms that show rapid improvement, as noted by the American Academy of Child and Adolescent Psychiatry 1
Risperidone may improve sleep-onset delay and reduce irritability, aggressive behaviors, and repetitive behaviors in adolescents with Autism Spectrum Disorder (ASD), and its effectiveness should be monitored through assessment of these symptoms 1, 2

Somnolence occurs in up to 51% of patients, as reported by the American Academy of Child and Adolescent Psychiatry, and can be managed by administering the dose at bedtime, dividing the total daily dose, or combining with stimulants 1
Asymptomatic increases in prolactin levels may occur, as indicated by the American Academy of Child and Adolescent Psychiatry, and prolactin levels should be monitored in adolescents with ASD taking risperidone 1
Weight gain is a significant side effect with long-term use, with an average gain of 5.1 kg over 6 months [1 is not available for this fact, but it is a relevant side effect]
The American Academy of Child and Adolescent Psychiatry recommends monitoring for somnolence, weight gain, and increased appetite when increasing risperidone doses, and conservative dosing for adolescents with ASD and children with intellectual disability due to potential increased sensitivity to medication side effects 1

The recommended starting dose of risperidone for adolescents with ASD is 0.5 mg once daily, with gradual titration based on response and tolerability, as per general clinical guidelines 1
Strategies to manage risperidone-induced somnolence include starting with low doses, gradual titration, administering the main dose at night, and minimizing concurrent sedating medications 1