Effect of Atypical Antipsychotics, Risperidone on Serum Creatine Phosphokinase / 대한정신약물학회지

ABSTRACT

OBJECTIVES: This prospective study was designed to investigate the effect of serotonergic atypical antipsychotics on serum creatine phosphokinase. METHOD: The subjects were 60 inpatients who were medicated risperidone and nemonapride, atypical antipsychotics. The symptoms of NMS such as fever and muscle rigidity and the level of CRK of all subjects were assessed on the 5th, 10th, 20th, and 30th medication day. RESULTS: Sociodemographic variables, such as sex and mean age and number of intramuscular injection were not different between the risperidone and the nemonapride group. Maximum dosage of antipsychotics (chlorpromazine equivalent) was significantly higher in the nemonapride group. Fever and muscle rigidity were not different between two groups (p>0.05). The change of serum creatine phosphokinase was significantly higher in the risperidone group than the nemonapride group (p<0.05). CONCLUSIONS: Serum CRK showed a significant increase in risperidone than nemonapride group. Such a finding is primarily caused by the effect of atypical antipsychotics mediating serotonergic effects. It is not recommanded to stop the medication by misunderstanding the effect as a prodrome symptom of NMS.