Sedative-hypnotics: flumazenil: practice question

A Pharmacology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Pharmacology · Sedative-hypnotics: flumazenil

Sample item

A 40-year-old woman on long-term clonazepam is brought unconscious after ingesting an unknown quantity of clonazepam and amitriptyline. Respiration is shallow and the ECG shows a wide QRS. A colleague suggests flumazenil. Why is it generally avoided here?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. It can precipitate seizures in a benzodiazepine-dependent patient with a pro-convulsant co-ingestant

Flumazenil is a competitive antagonist at the benzodiazepine site. In chronic users it precipitates withdrawal, and when tricyclic antidepressants or other pro-convulsant drugs are co-ingested it unmasks seizures, which are hard to control. It also has a short duration, so resedation can follow. Airway support is the safer approach.

Option by option

  • A. It potentiates tricyclic-induced sodium channel blockade into asystole

    Flumazenil has no action on sodium channels; the wide QRS is from the tricyclic itself.

  • B. It can precipitate seizures in a benzodiazepine-dependent patient with a pro-convulsant co-ingestant (correct)

    Reversal of benzodiazepine effect can unmask seizures from dependence and the tricyclic.

  • C. It permanently destroys benzodiazepine receptors

    Competitive antagonism is reversible and does not destroy receptors.

  • D. It causes severe hypotension by alpha blockade

    Flumazenil has no alpha-blocking effect and does not cause hypotension.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Pharmacology question

What is the answer to this Pharmacology question?

The best answer is B, It can precipitate seizures in a benzodiazepine-dependent patient with a pro-convulsant co-ingestant. Flumazenil is a competitive antagonist at the benzodiazepine site.

Why is "It potentiates tricyclic-induced sodium channel blockade into asystole" not the answer?

Flumazenil has no action on sodium channels; the wide QRS is from the tricyclic itself.

Why is "It permanently destroys benzodiazepine receptors" not the answer?

Competitive antagonism is reversible and does not destroy receptors.

Why is "It causes severe hypotension by alpha blockade" not the answer?

Flumazenil has no alpha-blocking effect and does not cause hypotension.

What concept does this question test?

It tests Sedative-hypnotics: flumazenil in Pharmacology. In chronic users it precipitates withdrawal, and when tricyclic antidepressants or other pro-convulsant drugs are co-ingested it unmasks seizures, which are hard to control. It also has a short duration, so resedation can follow. Airway support is the safer approach.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Sedative-hypnotics: flumazenil?

Learn drugs as classes, then the exception in each class that an examiner would pick. Then use the flashcards and the other Pharmacology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.