title: Assessment of strategies for switching patients from olanzapine to risperidone: a randomized, open-label, rater-blinded study.
abstract: BACKGROUND
  In clinical practice, physicians often need to change the antipsychotic medications they give to patients because of an inadequate response or the presence of unacceptable or unsafe side effects. However, there is a lack of consensus in the field as to the optimal switching strategy for antipsychotics, especially with regards to the speed at which the dose of the previous antipsychotic should be reduced. This paper assesses the short-term results of strategies for the discontinuation of olanzapine when initiating risperidone.
  
  
  METHODS
  In a 6-week, randomized, open-label, rater-blinded study, patients with schizophrenia or schizoaffective disorder, on a stable drug dose for more than 30 days at entry, who were intolerant of or exhibiting a suboptimal symptom response to more than 30 days of olanzapine treatment, were randomly assigned to the following switch strategies (common risperidone initiation scheme; varying olanzapine discontinuation): (i) abrupt strategy, where olanzapine was discontinued at risperidone initiation; (ii) gradual 1 strategy, where olanzapine was given at 50% entry dose for 1 week after risperidone initiation and then discontinued; or (iii) gradual 2 strategy, where olanzapine was given at 100% entry dose for 1 week, then at 50% in the second week, and then discontinued.
  
  
  RESULTS
  The study enrolled 123 patients on stable doses of olanzapine. Their mean age was 40.3 years and mean (+/- standard deviation (SD)) baseline Positive and Negative Syndrome Scale (PANSS) total score of 75.6 +/- 11.5. All-cause treatment discontinuation was lowest (12%) in the group with the slowest olanzapine dose reduction (gradual 2) and occurred at half the discontinuation rate in the other two groups (25% in abrupt and 28% in gradual 1). The relative risk of early discontinuation was 0.77 (confidence interval 0.61-0.99) for the slowest dose reduction compared with the other two strategies. After the medication was changed, improvements at endpoint were seen in PANSS total score (-7.3; p < 0.0001) and in PANSS positive (-3.0; p < 0.0001), negative (-0.9; p = 0.171) and anxiety/depression (-1.4; p = 0.0005) subscale scores. Severity of movement disorders and weight changes were minimal.
  
  
  CONCLUSIONS
  When switching patients from olanzapine to risperidone, a gradual reduction in the dose of olanzapine over 2 weeks was associated with higher rates of retention compared with abrupt or less gradual discontinuation. Switching via any strategy was associated with significant improvements in positive and anxiety symptoms and was generally well tolerated.
  
  
  BACKGROUND
  ClinicalTrials.gov NCT00378183.
authors.affiliation: Western Psychiatric Institute and Clinic, O'Hara Street, Pittsburgh, PA 15213-2593, USA. gangulir@msx.upmc.edu
authors.forename: Rohan
authors.initials: R
authors.lastname: Ganguli
authors.forename: Jaspreet S
authors.initials: JS
authors.lastname: Brar
authors.forename: Ramy
authors.initials: R
authors.lastname: Mahmoud
authors.forename: Sally A
authors.initials: SA
authors.lastname: Berry
authors.forename: Gahan J
authors.initials: GJ
authors.lastname: Pandina
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D001569:Benzodiazepines / Q000008:administration & dosage / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000077152:Olanzapine; D011618:Psychotic Disorders / Q000188:drug therapy*; D018967:Risperidone / Q000008:administration & dosage / Q000627:therapeutic use*; D012559:Schizophrenia / Q000188:drug therapy*; D016037:Single-Blind Method; D028761:Withholding Treatment
chemical_list: D014150:Antipsychotic Agents; D001569:Benzodiazepines; D018967:Risperidone; D000077152:Olanzapine