Author Question: Drug A produces a certain therapeutic effect at a dose of 5 mg/kg. Drug B produces the same ... (Read 116 times)

wrbasek0 · **on:** Jul 24, 2018

Drug A produces a certain therapeutic effect at a dose of 5 mg/kg. Drug B produces the same magnitude of effect at a dose of 0.1 mg/kg. How would the nurse describe the action of Drug A when compared to Drug B?

1. Drug A is more efficacious.
2. Drug A is less efficacious.
3. Drug A is more potent.
4. Drug A is less potent.

Question 2

What phrase best describes pharmacodynamics?

1. The potency of a drug
2. What the body does to a drug
3. How a drug exerts its effects
4. The efficacy of a drug

JaynaD87 · **Reply #1 on:** Jul 24, 2018

Answer to Question 1

Correct Answer: 4

Rationale 1: Efficacy is a concept that refers to the magnitude of the maximal response to a drug.
Rationale 2: Efficacy is a concept that refers to the magnitude of the maximal response to a drug.
Rationale 3: It takes a higher dose of drug A to produce the same effect as drug B; therefore, drug A is less potent than drug B.
Rationale 4: It takes a higher dose of drug A to produce the same effect as drug B; therefore, drug A is less potent than drug B.

Global Rationale: It takes a higher dose of drug A to produce the same effect as drug B; therefore, drug A is less potent than drug B. Efficacy is a concept that refers to the magnitude of the maximal response to a drug.

Answer to Question 2

Correct Answer: 3

Rationale 1: The potency of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.
Rationale 2: What the body does to a drug is incorrect because this is the definition of pharmacokinetics.
Rationale 3: How a drug exerts its effects is pharmacodynamics.
Rationale 4: The efficacy of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.

Global Rationale: How a drug exerts its effects is pharmacodynamics. The potency of a drug is incorrect because how a drug exerts its effects is pharmacodynamics. What the body does to a drug is incorrect because this is the definition of pharmacokinetics. The efficacy of a drug is incorrect because how a drug exerts its effects is pharmacodynamics.