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Why do amitriptyline and dothiepin appear to be so dangerous in overdose?
S A Montgomery1, D Baldwin, M Green
1St. Mary's Hospital Medical School, London, United Kingdom.
Acta Psychiatrica Scandinavica. Supplementum
|January 1, 1989
Summary
Amitriptyline and dothiepin are the antidepressants most likely to cause death from overdose. Safer alternatives exist, and understanding the risks associated with tricyclic antidepressants (TCAs) is crucial for patient safety.
Area of Science:
- Pharmacology
- Toxicology
- Clinical Psychiatry
Background:
- Antidepressants are widely prescribed for depression.
- Tricyclic antidepressants (TCAs) are a common class, but overdose risks vary.
- Understanding differential toxicity is vital for safe prescribing.
Purpose of the Study:
- To identify which antidepressants are most frequently associated with fatal overdoses in the UK.
- To compare the overdose toxicity of different antidepressant classes, particularly TCAs.
- To explore potential reasons for the higher toxicity of certain antidepressants.
Main Methods:
- Analysis of reported deaths from antidepressant overdoses in the United Kingdom.
- Comparison of fatality data across various antidepressant medications.
- Review of potential contributing factors to overdose mortality.
Main Results:
- Amitriptyline and dothiepin were most strongly linked to fatal overdoses.
- Most widely used TCAs, excluding clomipramine and lofepramine, were found to be dangerous in overdose.
- Mianserin, trazodone, viloxazine, and lofepramine appeared relatively safe in overdose.
Conclusions:
- Amitriptyline and dothiepin exhibit higher toxicity in overdose compared to other antidepressants.
- Factors such as inherent toxicity, potential for inducing suicidal behavior, and prescribing practices may contribute to observed differences.
- Further investigation is needed to elucidate the mechanisms behind the differential toxicity of antidepressants in overdose.