Flumazenil should be used with caution because it can precipitate seizures in which patients?

• A. Acute benzodiazepine overdose
• B. Chronic benzodiazepine users or mixed overdoses
• C. Pure alcohol overdose
• D. Opioid overdose

Answer: (B)

Flumazenil blocks the benzodiazepine site on the GABA-A receptor, reversing benzo-induced sedation. But in people who are dependent on benzodiazepines or when an overdose involves a mix of drugs including benzodiazepines, abruptly reversing their effects can provoke withdrawal seizures. Chronic users have adaptive changes in GABAergic systems, so removing the benzo effect suddenly tips the balance toward excitability and seizure. In mixed overdoses, removing benzodiazepine effects can similarly unleash seizure activity because other depressants or competing toxins may have been moderating brain activity, and now the protective benzodiazepine influence is abruptly lost. By contrast, pure alcohol or pure opioid overdoses don’t involve the benzodiazepine receptor, so flumazenil isn’t indicated and wouldn’t prevent the primary toxicity. Hence, the caution is specifically for chronic benzodiazepine users or mixed overdoses.