Pharmacokinetics (PK)
Pharmacokinetics (PK) is the study of how the body absorbs, distributes, metabolizes, and eliminates a drug over time. It describes what the body does to a medication and informs dosing decisions, drug interactions, and safe therapeutic ranges.
What is Pharmacokinetics (PK)?
Pharmacokinetics (PK) is the study of how the body handles a drug over time. It describes four processes: absorption into the body, distribution to tissues, metabolism into other compounds, and elimination from the system.
A useful way to frame it is that pharmacokinetics captures what the body does to a medication. It explains how drug concentrations rise and fall after a dose is given.
Why does Pharmacokinetics (PK) matter?
Understanding how a drug is absorbed, distributed, metabolized, and cleared informs decisions about dose size, dosing interval, and the safe therapeutic range. It explains why some drugs must be taken more frequently than others.
Pharmacokinetic knowledge also underpins the analysis of drug interactions and the adjustment of doses for patients whose metabolism or organ function differs. It is foundational to prescribing medications safely and effectively.
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