Plasma concentrations of risperidone and 9-hydroxyrisperidone: effect of comedication with carbamazepine or valproate. - Spina,E.; Avenoso,A.; Facciola,G.; Salemi,M.; Scordo,M.; Giacobello,T.; Madia,A.; Perucca,E. (Ther Drug Monit, 2000)