When comparing drugs A and B, which of the following statements is INCORRECT?

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A dose of 1 mg of drug A produces the same effect as 3 mg of drug B, indicating that A is more potent.A 1 mg dose of drug A elicits a response that cannot be achieved even with the highest tolerated dose of drug B, showing that A has greater efficacy.A 1 mg dose of drug A causes an effect that 1 mg of drug B does not, suggesting drug A is more efficacious.The efficacy of a drug does not depend on the dose administered.None of the above.

Explanation

Efficacy refers to the maximum effect a drug can produce and is independent of the dose given, whereas potency relates to the amount of drug needed to produce a given effect. Therefore, the statement that efficacy is not dose dependent is true, making option D the incorrect statement in the context of the question.