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Acute amitriptyline withdrawal and hyponatraemia. A case report
1Accident and Emergency Department, Northern General Hospital, Sheffield, England.
Drug Safety
|January 1, 1993
Summary
Tricyclic antidepressant withdrawal can mimic toxicity. This case highlights the importance of considering withdrawal symptoms, even when clinical signs suggest overdose, for accurate diagnosis and treatment.
Area of Science:
- Pharmacology
- Clinical Toxicology
- Neuroscience
Background:
- Tricyclic antidepressants (TCAs) are widely prescribed for depression.
- TCAs are frequently involved in overdose cases, with amitriptyline toxicity being well-documented.
- Abrupt cessation of TCAs can lead to detrimental withdrawal phenomena, often resembling the original depressive symptoms.
Observation:
- A patient presented with clinical features mimicking amitriptyline toxicity, including neurological signs and a distended bladder.
- Simultaneously, signs of cholinergic hyperactivity suggested acute withdrawal.
- The diagnostic challenge was compounded by the patient's condition.
Findings:
- A biochemically confirmed case of amitriptyline withdrawal was identified.
- Plasma TCA concentrations and further patient history were crucial for confirming the diagnosis.
- Hyponatremia may have played a role in exacerbating the patient's condition.
Implications:
- Clinical presentation of TCA withdrawal can be mistaken for acute toxicity.
- Biochemical analysis of plasma TCA levels is essential for differentiating withdrawal from toxicity.
- Awareness of TCA withdrawal is critical for appropriate patient management and avoiding misdiagnosis.