Which statement describes pharmacokinetics?

Which statement describes pharmacokinetics?

• A. Time course of drug concentration in the body
• B. What the body does to the drug
• C. How the drug is absorbed
• D. How the drug is eliminated

Answer: (A)

Pharmacokinetics describes how drug levels in the body change over time as the drug is absorbed, distributed, metabolized, and eliminated. The most clinically useful way to define it is the time course of drug concentration in the body, which explains when a drug reaches therapeutic levels, how high the peak is, how long it lasts, and when it’s cleared. The individual processes—absorption, distribution, metabolism, and excretion—are the mechanisms that shape that concentration–time profile, but the overarching concept is the changing concentration over time. That focus on the concentration-time curve best captures what pharmacokinetics aims to describe in patient care.

Pharmacokinetics describes how drug levels in the body change over time as the drug is absorbed, distributed, metabolized, and eliminated. The most clinically useful way to define it is the time course of drug concentration in the body, which explains when a drug reaches therapeutic levels, how high the peak is, how long it lasts, and when it’s cleared. The individual processes—absorption, distribution, metabolism, and excretion—are the mechanisms that shape that concentration–time profile, but the overarching concept is the changing concentration over time. That focus on the concentration-time curve best captures what pharmacokinetics aims to describe in patient care.