Which of the following best defines "pharmacokinetics"?

Pharmacokinetics is best defined as the processing of drugs within the body. This term encompasses the absorption, distribution, metabolism, and excretion of drugs, often summarized by the acronym ADME. Understanding pharmacokinetics is crucial for determining the appropriate dosage and timing of medication to achieve optimal therapeutic effects while minimizing side effects.

In contrast to the other options: the effect of drugs on the body refers to pharmacodynamics, focusing on how drugs produce their effects. The interaction between different drugs pertains to drug-drug interactions, influencing therapeutic outcomes and potential toxicity. Finally, the administration of medication involves the routes and methods used to deliver drug therapy, rather than how the body processes it. These distinctions highlight the specific focus of pharmacokinetics on the body's handling of drugs, making the understanding of this concept essential for effective medication management.