Risperidone typically starts to show some effects within 1 to 2 weeks of starting treatment, with certain symptoms like drowsiness or calming of aggression sometimes happening shortly after a dose. However, it can take 2 to 3 months for the full therapeutic effects to be felt. Injectable forms may take longer to fully enter the system, with effects noticeable about 3 weeks after the first injection. If no improvement is seen within a few weeks, dosage adjustments might be needed. Taking risperidone at bedtime is often recommended to help manage drowsiness caused by the medication.
