Veterinary and human toxicology
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Severe tricyclic antidepressant (TCA) overdose is generally manifested by cardiovascular and/or central nervous system toxicity. Although the majority of patients who are comatose following these overdoses regain consciousness within 24 h, this case had 5-days of coma with associated loss of brainstem reflexes. Severe central nervous system depression can occur as a sole manifestation of TCA overdose without concomitant cardiovascular toxicity.