Risperidone is an atypical antipsychotic medicine widely prescribed for the treatment of schizophrenia, bipolar disorder, and irritability associated with autism spectrum disorder. It works by balancing dopamine and serotonin activity in the brain, which helps reduce hallucinations, delusions, disorganized thinking, and mood instability. In schizophrenia, risperidone improves social functioning and decreases symptoms such as paranoia and withdrawal. For bipolar disorder, it is used both in acute manic episodes and as maintenance therapy to prevent recurrence of mood swings. In autism spectrum disorder, risperidone is effective in managing irritability, aggression, and self‑injurious behavior.