Abstract
Pharmacology is the science underpinning dosing, mechanisms of action and effectiveness of drugs. Central to pharmacology, are the studies of pharmacokinetics (PK) and pharmacodynamics (PD). On one hand, PK defines the time-course of drug concentrations in the body and incorporates the broad concepts of drug absorption, distribution, metabolism and elimination. On the other hand, PD describes the relationship between drug concentrations and pharmacological effects. In practice, PK is often referred as “what the body does to the drug” whilst PD as “what the drug does to the body”. Thus, PK/PD describes the relationship between drug dose and pharmacological effects with changes in drug concentrations leading to different pharmacological effects.
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