The Relationship between EPS and Risperidone in Autism Spectrum Disorders by Prescription Sequence Symmetry Analysis

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Chuenchanok Worathongchai
Rattawit Papralit
Chompoonuch Werawattanachai
Tatta Sriboonruang
Sawaeng Watcharathanakij

Abstract

Introduction: At  present,  the  incidence  of  Autism  Spectrum  Disorders  (ASDs)  steadily increases.   Antipsychotic  drug  recommended  for  treatment  of  ASDs  and  available  in  Thailand  is Risperidone.  However, it can cause Extrapyramidal side effects (EPS).  The objective of this study was to measure the  relationship between EPS and  risperidone in ASDs by  a screening tool  called Prescription Sequence Symmetry Analysis (PSSA). Methods: This retrospective research used data from electronic database to identify prescriptions initiated with anticholinergic drugs before  initiation of  risperidone  (Marker  to  Index)  and  prescriptions initiated  with  risperidone  before  initiation  of anticholinergic drugs (Index to Marker) during January 1, 2011 to December 31, 2015.  PSSA was used  to  analyze  the  relationship  between  risperidone  and  EPS  and  presented  as  sequence  ratio. Results: Of 23 prescriptions identified, 20 (86.96%) prescriptions initiated with risperidone before the initiation  of  anticholinergic  drugs  (Index  to  Marker)  and  3  (13.04%)  prescriptions  initiated  with anticholinergic drugs before initiation of risperidone (Marker to Index).  The sequence ratio (SR) was 6.67. Conclusion: Risperidone  was  associated  with  EPS  in  ASDs  patients  from  PSSA  which  is convenient tool to use for drug safety surveillance.

Article Details

Section
Pharmaceutical Practice

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