title: Antipsychotics dosage and antiparkinsonian prescriptions.
abstract: BACKGROUND
  To study the link between the dosage of several antipsychotics and the prescription of antiparkinsonians in an observational study.
  
  
  METHODS
  In the context of a national naturalistic prospective observational study, a database containing all the prescriptions from 100 French psychiatrists during the year 2002 was analysed. The inclusion criteria were a diagnosis of schizophrenia or schizoaffective disorder and age over 18. The mean dosage of antipsychotics with and without antiparkinsonians was compared. Since there were multiple prescriptions for a given subject, generalised mixed linear models were also used to study the link between antiparkinsonian prescription and antipsychotic dosage.
  
  
  RESULTS
  antiparkinsonians were prescribed to 32,9% of the patients. Two groups of antipsychotics were observed relating to differences in dosage when an antiparkinsonian was co prescribed or not : a first group, where the mean dosage was higher with antiparkinsonians (risperidone, amisulpride and haloperidol) and a second group (clozapine, olanzapine), in which antiparkinsonian co prescription was not related to the dosage of antipsychotics.
  
  
  CONCLUSIONS
  As a conclusion, it can be said that it is important to consider the dosage and the type of antipsychotic in the treatment of patients suffering of schizophrenia, because neurological side effects are frequent and can impair quality of life. Moreover the prescription of antiparkinsonians can lead to different side effects such anticholinergic effects.
authors.affiliation: INSERM U669, PSIGIAM (Paris Sud Innovation Group in Adolescent Mental Health Methodology), 97 boulevard de Port-Royal, 75679 Paris cedex 14, France. eacqua7129@aol.com.
authors.forename: Eric
authors.initials: E
authors.lastname: Acquaviva
authors.forename: Isabelle
authors.initials: I
authors.lastname: Gasquet
authors.forename: Bruno
authors.initials: B
authors.lastname: Falissard