Problem: Which of the following is the best definition/description of the duration of action? Question options: Time it takes for 50% of a drug to be eliminated from the body Concentrations within this are both safe and effective A high dose of drug given so that the concentration of the drug reaching the therapeutic range faster The amount of time between the onset and termination of a drug's therapeutic effects The initial processing of a drug by the liver, before it reaches systemic circulation The percent of a drug that reaches its desired site of action compared to the dose of the drug given When the drug concentration is relatively stable, typically maintained within the therapeutic range via regular dosing A measure that indicates whether the drug is primarily in the tissues or the blood