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 does drug efficacy describe?

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

The answer and the reasoning

B. Maximum response produced

Efficacy describes the greatest response a drug can produce when sufficient dose is given, independent of how much drug is needed to reach that response.

Option by option

  • A. Dose required for effect

    Dose required to achieve an effect describes potency.

  • B. Maximum response produced (correct)

    Correct: efficacy is the maximum effect a drug can achieve.

  • C. Fraction absorbed

    Fraction absorbed relates to bioavailability.

  • D. Protein binding

    Protein binding affects distribution, not maximal response definition.

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 B, Maximum response produced. Efficacy describes the greatest response a drug can produce when sufficient dose is given, independent of how much drug is needed to reach that response.

Why is "Dose required for effect" not the answer?

Dose required to achieve an effect describes potency.

Why is "Fraction absorbed" not the answer?

Fraction absorbed relates to bioavailability.

Why is "Protein binding" not the answer?

Protein binding affects distribution, not maximal response definition.

What concept does this question test?

It tests Pharmacodynamics in Pharmacology. The correct option holds because: Correct: efficacy is the maximum effect a drug can achieve.

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.