Antidepressant use and salivary cortisol in depressive and anxiety disorders

Apr 5, 2011European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology

Antidepressant use and stress hormone levels in depression and anxiety

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Abstract

Antidepressant subtypes are associated with distinct alterations in cortisol levels among 1526 individuals with anxiety and depression.

TCA users exhibited a flattened cortisol awakening response, indicating significant changes in cortisol production.
SSRI users had higher evening cortisol levels compared to non-users, suggesting different impacts on daily cortisol rhythms.
SSRI users demonstrated decreased cortisol suppression after dexamethasone ingestion, pointing to altered stress response mechanisms.
The findings indicate that varying types of antidepressants may affect the body's stress regulation differently.

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Antidepressants are an effective treatment for depressive and anxiety disorders. Those disorders are frequently accompanied by heightened cortisol levels. Antidepressants may affect hypothalamic-pituitary-adrenal axis functioning, the alteration of which could be partially responsible for treatment efficacy. The association between antidepressants and cortisol was investigated in 1526 subjects of the Netherlands Study of Depression and Anxiety who were grouped into 'serotonin reuptake inhibitor (SSRI) users' (n=309), 'tricyclic antidepressant (TCA) users' (n=49), 'other antidepressant users' (n=100), and 'non-users' (n=1068). All subjects had a current or past diagnosis of anxiety and/or depression. Subjects provided 7 saliva samples from which 3 cortisol indicators were calculated: cortisol awakening response (CAR), evening cortisol, and cortisol suppression after ingestion of 0.5mg dexamethasone. As compared to non-users, TCA users had a flattened CAR (effect size: Cohen's d=0.34); SSRI users had higher evening cortisol levels (d=0.04); and SSRI users showed decreased cortisol suppression after dexamethasone ingestion (d=0.03). These findings suggest that antidepressant subtypes are associated with distinct alterations of the HPA axis. TCA users, who showed a flattened CAR, displayed the strongest alterations of salivary cortisol.

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Antidepressant use and salivary cortisol in depressive and anxiety disorders

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