Toxicokinetics of dothiepin: 2 case reports

Area of Science:

• Toxicology
• Pharmacokinetics
• Emergency Medicine

Background:

• Intentional dothiepin intoxication presents a significant clinical challenge.
• Accurate assessment of overdose severity is critical for patient management.

Observation:

• Two cases of intentional dothiepin intoxication are detailed, both resulting in survival with supportive care.
• Dothiepin and metabolite plasma levels were monitored post-ingestion.
• Case 1 involved a toxicokinetic model analysis, correlating peak levels with QRS duration and symptoms.
• Case 2 presented a combined dothiepin-ethanol intoxication, complicating clinical parameter interpretation.

Findings:

• Initial dothiepin levels were 1900 µg/L (Case 1) and 5500 µg/L (Case 2).
• Plasma dothiepin concentrations alone poorly predict intoxication severity.
• Timing of ingestion is a critical factor in interpreting plasma levels.
• QRS duration interpretation may be unreliable, especially in combined intoxications.

Implications:

• A comprehensive evaluation including clinical parameters, QRS duration, symptoms, and dothiepin concentrations is essential.
• Consideration of co-ingestions is vital for accurate clinical assessment in dothiepin overdose.
• This highlights the complexity of managing tricyclic antidepressant overdoses.