Mechanism of Action and Clinical Implications of Risperidone

Primary Receptor Mechanisms and Clinical Effects

• The American Academy of Sleep Medicine notes that risperidone's combined 5-HT2 and D2 antagonism contributes to efficacy in treating PTSD-related nightmares 1
• The American Academy of Child and Adolescent Psychiatry indicates this mechanism underlies effectiveness in treating disruptive behavior disorders in children with intellectual disabilities 1

Common Mechanistic Side Effects

• Antagonism at the D2 receptor in the tuberoinfundibular pathway is associated with hyperprolactinemia, particularly in children, according to the American Academy of Child and Adolescent Psychiatry 2
• D2 antagonism in the nigrostriatal pathway is linked to extrapyramidal side effects, with risperidone having the highest risk among atypical agents, as reported by the Journal of the American Academy of Child and Adolescent Psychiatry 3
• H1 antagonism is associated with sedation and weight gain, while α1 antagonism is linked to orthostatic hypotension, as noted by the Journal of the American Academy of Child and Adolescent Psychiatry 3
• The American Academy of Child and Adolescent Psychiatry suggests considering alternatives like aripiprazole when prolactin elevation is a concern 2