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Related Experiment Videos

Why do fatal overdose rates vary between antidepressants?

R D Farmer1, R M Pinder

  • 1Charing Cross and Westminster Medical School, University of London, United Kingdom.

Acta Psychiatrica Scandinavica. Supplementum
|January 1, 1989
PubMed
Summary

Different antidepressant drugs show varying death rates from overdose. Tricyclic antidepressants like amitriptyline pose higher risks, especially in suicide patients, necessitating careful prescription consideration.

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Area of Science:

  • Pharmacology
  • Public Health
  • Toxicology

Background:

  • Antidepressant medications are widely prescribed for mental health conditions.
  • Understanding the comparative toxicity and overdose risks of different antidepressants is crucial for patient safety.
  • Previous research has indicated variations in antidepressant-related mortality.

Purpose of the Study:

  • To calculate and compare age-specific death rates for poisoning involving various antidepressant drugs.
  • To identify specific antidepressants with higher mortality risks.
  • To inform clinical prescribing practices regarding antidepressant overdose risks.

Main Methods:

  • Analysis of mortality statistics and prescription data in England and Wales (1979-1985).
  • Calculation of age-specific death rates for poisoning by different antidepressant classes.

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  • Comparison of mortality rates across different drugs and age groups (under 65 vs. over 65).

    • Main Results:

    • Significant variations in mortality rates were observed among different antidepressant drugs.
    • Amitriptyline and dothiepin exhibited the highest mortality rates, while mianserin and clomipramine had the lowest.
    • Over-65s showed lower mortality rates, potentially due to under-detection of poisoning.
    • Fatal overdoses of amitriptyline and dothiepin frequently involved multiple substances.

    Conclusions:

    • Mortality rate variations are primarily attributed to inherent drug toxicity (especially cardiovascular effects), with compliance playing a minor role.
    • The risk of death from antidepressant overdose should be a key consideration during prescription.
    • Tricyclic antidepressants (e.g., amitriptyline, dothiepin) should be avoided in patients at risk of suicide.