Pharmacodynamics: 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 · Pharmacodynamics

Sample item

What is the usual effect of a noncompetitive antagonist on a dose-response curve?

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

The answer and the reasoning

C. Reduces maximal response

A noncompetitive antagonist reduces available functional receptors or signalling, so additional agonist cannot restore the original maximal response.

Option by option

  • A. Shifts curve right with same maximum

    Competitive antagonism preserves Emax with right shift.

  • B. Raises bioavailability

    Bioavailability is unrelated to receptor antagonism.

  • C. Reduces maximal response (correct)

    Correct: Emax falls when blockade cannot be overcome.

  • D. Increases agonist efficacy

    Antagonists do not raise agonist efficacy.

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.

More Pharmacology questions

Questions about this Pharmacology question

What is the answer to this Pharmacology question?

The best answer is C, Reduces maximal response. A noncompetitive antagonist reduces available functional receptors or signalling, so additional agonist cannot restore the original maximal response.

Why is "Shifts curve right with same maximum" not the answer?

Competitive antagonism preserves Emax with right shift.

Why is "Raises bioavailability" not the answer?

Bioavailability is unrelated to receptor antagonism.

Why is "Increases agonist efficacy" not the answer?

Antagonists do not raise agonist efficacy.

What concept does this question test?

It tests Pharmacodynamics in Pharmacology. The correct option holds because: Correct: Emax falls when blockade cannot be overcome.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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 Pharmacodynamics?

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.