Which statement about a TCA overdose is true?

Which statement about a TCA overdose is true?

• A. It is life-threatening and should not be prescribed to a suicidal patient.
• B. It is never dangerous and can be managed at home.
• C. It has no effect on cardiac conduction.
• D. It only affects mood with no physical side effects.

Answer: (A)

Tricyclic antidepressants have a narrow safety margin, so overdose can be life-threatening because of their effects on the heart and brain. In overdose, the drug blocks cardiac sodium channels, which slows conduction and can lead to dangerous arrhythmias; it also causes anticholinergic effects, seizures, and coma. Because of this high risk, these medications should be avoided in patients with active suicidal ideation or intent, since an overdose could be fatal. In practice, safer alternatives are chosen for someone at risk of self-harm, and if a TCA overdose occurs, hospital admission with cardiac monitoring and specific treatments (for example, intravenous bicarbonate to address the sodium channel blockade) is required rather than home management. The other statements overlook the serious cardiac and systemic toxicity and the real danger of overdose.

Tricyclic antidepressants have a narrow safety margin, so overdose can be life-threatening because of their effects on the heart and brain. In overdose, the drug blocks cardiac sodium channels, which slows conduction and can lead to dangerous arrhythmias; it also causes anticholinergic effects, seizures, and coma. Because of this high risk, these medications should be avoided in patients with active suicidal ideation or intent, since an overdose could be fatal. In practice, safer alternatives are chosen for someone at risk of self-harm, and if a TCA overdose occurs, hospital admission with cardiac monitoring and specific treatments (for example, intravenous bicarbonate to address the sodium channel blockade) is required rather than home management. The other statements overlook the serious cardiac and systemic toxicity and the real danger of overdose.