A drug binds to a receptor and prevents another drug from producing its effect. Which pharmacodynamic action does this describe?
Correct answer: B. Antagonist action
- A. Agonist action
- B. Antagonist action
- C. Synergistic action
- D. Potentiating action
Explanation
An antagonist binds to a receptor and blocks or reduces the action of another drug or natural substance. An agonist activates the receptor, while synergism means combined effects are greater than expected.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Principles of Pharmacology
Pharmacology examines drug sources, names, dosage forms, mechanisms of action, absorption, distribution, metabolism and excretion. Questions cover pharmacokinetics versus pharmacodynamics, therapeutic effects, adverse reactions, contraindications, drug interactions, tolerance, dependence and the safety responsibilities of the nurse.
Practise Principles of Pharmacology
50 free Principles of Pharmacology MCQs from Nursing Pharmacology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Nursing Pharmacology questions like this
Nursing Pharmacology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Principles of Pharmacology questions
Which name is the standard nonproprietary name used for a drug in medication references?
A nurse discovers that a patient received another patient's medication. What is the nurse's priority action?
A patient asks why a drug given by intravenous injection often acts faster than the same drug taken by mouth. Which response is correct?
A patient takes tetracycline with an aluminium-containing antacid. Which effect should the nurse anticipate?
A patient with severe renal impairment receives a drug that is mainly eliminated through the kidneys. Which prescription-related concern should the nurse raise?
Which dosage form should the patient swallow whole because crushing it may release the drug too quickly?