1. Amisulpride augmentation of clozapine for treatment-refractory schizophrenia: a double-blind, placebo-controlled trial
- Author
-
Carol Paton, Zachary Fitzgerald, Louise Marston, Patrick Keown, Thomas R. E. Barnes, Rameez Zafar, Khalid Iqbal, Mariwan Husni, Peter M. Haddad, Vineet Singh, Pavel Fridrich, Raj Kumar, Verity C. Leeson, Tim Amos, Hemant Bagalkote, and David Osborn
- Subjects
clozapine augmentation ,medicine.medical_specialty ,STRATEGIES ,medicine.medical_treatment ,Placebo-controlled study ,NEGATIVE SYMPTOMS ,Double blind ,03 medical and health sciences ,0302 clinical medicine ,Refractory ,Internal medicine ,RISPERIDONE ,MANAGEMENT ,medicine ,Amisulpride ,RATING-SCALE ,QUETIAPINE ,Antipsychotic ,Pharmacology, Toxicology and Pharmaceutics (miscellaneous) ,METAANALYSIS ,Clozapine ,Psychiatry ,Science & Technology ,clozapine ,business.industry ,Treatment refractory ,COMBINATIONS ,medicine.disease ,antipsychotic medication ,030227 psychiatry ,amisulpride ,Schizophrenia ,Original Article ,Psychology (miscellaneous) ,business ,Life Sciences & Biomedicine ,treatment-resistant schizophrenia ,030217 neurology & neurosurgery ,medicine.drug - Abstract
Background:A second antipsychotic is commonly added to clozapine to treat refractory schizophrenia, notwithstanding the limited evidence to support such practice.Methods:The efficacy and adverse effects of this pharmacological strategy were examined in a double-blind, placebo-controlled, 12-week randomized trial of clozapine augmentation with amisulpride, involving 68 adults with treatment-resistant schizophrenia and persistent symptoms despite a predefined trial of clozapine.Results:There were no statistically significant differences between the amisulpride and placebo groups on the primary outcome measure (clinical response defined as a 20% reduction in total Positive and Negative Syndrome Scale score) or other mental state measures. However, the trial under recruited and was therefore underpowered to detect differences in the primary outcome, meaning that acceptance of the null hypothesis carries an increased risk of type II error. The findings suggested that amisulpride-treated participants were more likely to fulfil the clinical response criterion, odds ratio 1.17 (95% confidence interval 0.40–3.42) and have a greater reduction in negative symptoms, but these numerical differences were not statistically significant and only evident at 12 weeks. A significantly higher proportion of participants in the amisulpride group had at least one adverse event compared with the control group ( p = 0.014), and these were more likely to be cardiac symptoms.Conclusions:Treatment for more than 6 weeks may be required for an adequate trial of clozapine augmentation with amisulpride. The greater side-effect burden associated with this treatment strategy highlights the need for safety and tolerability monitoring, including vigilance for indicators of cardiac abnormalities, when it is used in either a clinical or research setting.
- Published
- 2018
- Full Text
- View/download PDF