Flumazenil reverses benzodiazepine sedation by competitive antagonism at the benzodiazepine site. In which clinical situation is flumazenil administration MOST likely to precipitate acute harm?

• A Mixed overdose with a tricyclic antidepressant in a chronically benzodiazepine-dependent patient ✓
• B Isolated benzodiazepine overdose in a patient not dependent on these drugs
• C Post-anesthetic reversal after midazolam sedation for endoscopy
• D Overdose with zolpidem alone in a healthy young adult

Explanation

Two settings make flumazenil dangerous. First, in chronic benzodiazepine users it precipitates severe withdrawal with seizures. Second, in mixed tricyclic antidepressant overdose it unmasks proconvulsant tricyclic activity and has been linked to arrhythmias and seizures. Isolated benzodiazepine overdose in a non-dependent patient, routine post-sedation reversal, and pure zolpidem overdose (zolpidem has low affinity for flumazenil-sensitive sites and rarely causes deep coma) are all situations where benefit outweighs risk.

Reference: Katzung Basic and Clinical Pharmacology, 15th ed.

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