Which agent acts as a receptor antagonist at benzodiazepine sites?

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Flumazenil acts as a receptor antagonist at benzodiazepine sites on the GABA-A receptor. Benzodiazepines are positive allosteric modulators that bind to a specific site on the GABA-A chloride channel and enhance GABA’s effect, increasing chloride influx and producing sedation, anxiolysis, and potential respiratory depression. Flumazenil competitively blocks that benzodiazepine binding site, quickly reversing these effects when someone has oversedation or an overdose. The other drugs listed don’t reverse benzodiazepines: naloxone blocks opioid receptors, reversing opioid effects, while morphine and meperidine are opioid agonists themselves. Keep in mind flumazenil’s action is relatively short-lived compared with some benzodiazepines, so repeated dosing may be needed if a longer-acting benzodiazepine is involved, with caution for withdrawal or seizure risk in long-term users.