The term "duration of action" refers to which of the following descriptions?

Question

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Duration of action is the time during which drug concentration is sufficient to elicit a therapeutic response.
The time it takes for the drug to elicit a therapeutic response defines a drug's "onset of action." The time it takes a drug to reach its maximum therapeutic response defines a drug's "peak effect." "The length of time it takes to remove a drug from circulation" addresses a drug's elimination and does not define duration of action correctly.

The Term "Duration of Action" Refers to Which of the Following