2420
CONCLUSION: We believe that risperidone is not a substitute for clozapine in treating psychosis in parkinsonian patients and should be used with caution.
 parkinsonian patients: Subject; parkinsonian: Subject.Disorder; risperidone: Treatment; psychosis: Treatment.Disorder; risperidone: Treatment.Drug
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 parkinsonian patients: Subject; parkinsonian: Subject.Disorder; risperidone: Treatment; psychosis: Treatment.Disorder; risperidone: Treatment.Drug