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Varenicline for cognitive impairment in people with schizophrenia: systematic review and meta-analysis

  • Timothy Tanzer
  • Shelukumar Shah
  • Catherine Benson
  • Veronica De Monte
  • Victoria Gore-Jones
  • Susan L. Rossell
  • Frances Dark
  • Steve Kisely
  • Dan Siskind
  • Catarina Drumonde MeloEmail author
Review

Abstract

Background

People with schizophrenia frequently have cognitive dysfunction, which does not respond to pharmacological interventions. Varenicline has been identified as a potential treatment option for nicotinic receptor dysfunction with a potential to treat cognitive impairment in schizophrenia.

Methods

We conducted a systematic review of Pubmed, Embase, Psycinfo, CINAHL and the Cochrane Schizophrenia Trial Registry for randomised controlled trials of varenicline in people with schizophrenia for cognitive dysfunction. We excluded trials among people with dementia. We then undertook a meta-analysis with the primary outcome of difference in change of cognitive measures between varenicline and placebo as well as secondary outcomes of difference in rates of adverse events. We conducted a sensitivity analysis on smoking status and study duration.

Results

We included four papers in the meta-analysis (n = 339). Varenicline was not superior to placebo for overall cognition (SMD = −0.022, 95% CI −0.154–0.110; Z = −0.333; p = 0.739), attention (SMD = −0.047, 95% CI −0.199–0.104; Z = −0.613; p = 0.540), executive function (SMD = −0.060, 95% CI −0.469–0.348; Z =− 0.290; p = 0.772) or processing speed (SMD = 0.038, 95% CI −0.232–0.308; Z = 0.279; p = 0.780). There was no difference in psychotic symptoms, but varenicline was associated with higher rates of nausea. Sensitivity analyses for smoking status and study duration did not alter the results.

Conclusion

Within the present literature, varenicline does not appear to be a useful target compound for improving cognitive impairment in schizophrenia. Based on these results, a trial would need over 2500 participants to be powered to show statistically significant findings.

Keywords

Schizophrenia cognition Varenicline Systematic review Meta-analysis 

Notes

Acknowledgements

DS is supported in part by a National Health and Medical Research Council (NHMRC) Early Career Fellowship (GNT1111136). SLR holds a Senior Research Fellowship from NHMRC (GNT1154651).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Timothy Tanzer
    • 1
  • Shelukumar Shah
    • 2
    • 3
  • Catherine Benson
    • 2
    • 3
  • Veronica De Monte
    • 2
  • Victoria Gore-Jones
    • 2
  • Susan L. Rossell
    • 4
    • 5
  • Frances Dark
    • 2
    • 3
  • Steve Kisely
    • 2
    • 3
  • Dan Siskind
    • 2
    • 3
  • Catarina Drumonde Melo
    • 6
    Email author
  1. 1.Department of PharmacyPrincess Alexandra HospitalBrisbaneAustralia
  2. 2.Metro South Addiction and Mental Health ServiceBrisbaneAustralia
  3. 3.School of MedicineUniversity of QueenslandBrisbaneAustralia
  4. 4.Centre for Mental HealthSwinburne University of TechnologyMelbourneAustralia
  5. 5.PsychiatrySt Vincent’s HospitalMelbourneAustralia
  6. 6.Faculty of Agricultural Sciences and EnvironmentUniversity of AzoresAngra do HeroísmoPortugal

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