Which branch is defined as the study of how a drug is processed by the body, including absorption, duration of action, distribution, and excretion?

Which branch is defined as the study of how a drug is processed by the body, including absorption, duration of action, distribution, and excretion?

• A. Pharmacodynamics
• B. Toxicity
• C. Anatomy
• D. Pharmacokinetics

Answer: (D)

Pharmacokinetics is the branch that describes how a drug is processed by the body. It covers absorption, distribution, metabolism, and excretion (ADME), and these steps determine how long the drug stays active and how its concentration changes over time, which relates to the duration of action. In short, pharmacokinetics explains what the body does to the drug as it moves through and out of the body. By contrast, pharmacodynamics focuses on what the drug does to the body—the mechanism of action and the resulting effects. Toxicity concerns adverse effects, while anatomy is the study of body structure.

Pharmacokinetics is the branch that describes how a drug is processed by the body. It covers absorption, distribution, metabolism, and excretion (ADME), and these steps determine how long the drug stays active and how its concentration changes over time, which relates to the duration of action. In short, pharmacokinetics explains what the body does to the drug as it moves through and out of the body. By contrast, pharmacodynamics focuses on what the drug does to the body—the mechanism of action and the resulting effects. Toxicity concerns adverse effects, while anatomy is the study of body structure.