Seven published papers were identified on the use of aripiprazole, olanzapine and quetiapine. Internal validity of the trials was fairly good, external validity only moderate. Different outcome measures of efficacy and safety were assessed. When the individual trials were looked at, quetiapine and to a lesser extent olanzapine demonstrated significant improvement in MADRS (Montgomery–Åsberg Depression Rating Scale) total scores. This was not demonstrated for aripiprazole. Efficacy was hampered by adverse events, such as weight gain, akathisia and somnolence/sedation. Both clinical heterogeneity of the included trials and statistical heterogeneity of the meta-analytic data were considerable. The number of quetiapine trials was disproportionate to the number of trials of aripiprazole and olanzapine. Further research is needed to assess differential efficacy of the different SGAs and their use in clinical practice.
Second generation antipsychotics in the treatment of bipolar depression: a systematic review and meta-analysis
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