The correct answer is pharmacokinetics.
The study of pharmacokinetics explains how the body processes medications. Pharmacodynamics studies the physiological effects of medications. The transfer of a chemical from a region of higher concentration to one of lower concentration is known as diffusion. The movement of a chemical against a concentration or gradient is known as active transport.
The study of how the body reacts to drugs provided over the course of exposure is known as pharmacokinetics (PK) (medications for the sake of this article). This is closely related to pharmacodynamics, which closely investigates the drug's impact on the body, but it differs from it in important ways.
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