Pharmacokinetics research is the science of studying the absorption, distribution, metabolism and excretion of drugs in the body. By measuring the change of drug concentration in the body over time, the bioavailability, half-life, clearance rate and other parameters of the drug are revealed. This information helps optimize drug dosage, develop medication regimens, and predict drug effects and side effects in different individuals. Pharmacokinetic studies play an important role in drug development, personalized treatment, and drug safety assessment.