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Do antidepressants increase the risk of mania and bipolar disorder in people with depression? A retrospective electronic case register cohort study
  1. Rashmi Patel1,
  2. Peter Reiss1,
  3. Hitesh Shetty2,
  4. Matthew Broadbent2,
  5. Robert Stewart3,
  6. Philip McGuire1,
  7. Matthew Taylor1
  1. 1Department of Psychosis Studies, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
  2. 2Biomedical Research Centre Nucleus, South London and Maudsley NHS Foundation Trust, London, UK
  3. 3Department of Psychological Medicine, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
  1. Correspondence to Dr Rashmi Patel; bmj{at}rpatel.co.uk

Abstract

Objectives To investigate the association between antidepressant therapy and the later onset of mania/bipolar disorder.

Design Retrospective cohort study using an anonymised electronic health record case register.

Setting South London and Maudsley National Health Service (NHS) Trust (SLaM), a large provider of inpatient and community mental healthcare in the UK.

Participants 21 012 adults presenting to SLaM between 1 April 2006 and 31 March 2013 with unipolar depression.

Exposure Prior antidepressant therapy recorded in electronic health records.

Main outcome measure Time to subsequent diagnosis of mania or bipolar disorder from date of diagnosis of unipolar depression, censored at 31 March 2014.

Methods Multivariable Cox regression analysis with age and gender as covariates.

Results The overall incidence rate of mania/bipolar disorder was 10.9 per 1000 person-years. The peak incidence of mania/bipolar disorder incidence was seen in patients aged between 26 and 35 years (12.3 per 1000 person-years). Prior antidepressant treatment was associated with an increased incidence of mania/bipolar disorder ranging from 13.1 to 19.1 per 1000 person-years. Multivariable analysis indicated a significant association with selective serotonin reuptake inhibitors (HR 1.34, 95% CI 1.18 to 1.52) and venlafaxine (1.35, 1.07 to 1.70).

Conclusions In people with unipolar depression, antidepressant treatment is associated with an increased risk of subsequent mania/bipolar disorder. These findings highlight the importance of considering risk factors for mania when treating people with depression.

  • antidepressant induced mania
  • manic switch
  • CRIS
  • electronic health records
  • SSRI
  • venlafaxine

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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