* Coadministration with carbamazepine may decrease the plasma concentrations of risperidone and its pharmacologically active metabolite, 9-hydroxyrisperidone.
* Risperidone should be given at higher dosage to control psychotic symptoms. <ref name="drugscom">
* Pharmacologic response and plasma risperidone levels should be monitored more closely whenever carbamazepine is added to or withdrawn from therapy. <ref name="drugscom">{{Drugscominteract|risperidone-with-carbamazepine|risperidone|carbamazepine}}</ref>