Farmakokinetik is the study of how drugs move through the body. It involves four main processes: absorption, distribution, metabolism, and excretion. Absorption refers to how a drug enters the bloodstream, while distribution describes how it spreads throughout the body. Metabolism involves the chemical changes a drug undergoes, often in the liver, and excretion is the process of removing the drug from the body, usually through urine or feces. Understanding farmakokinetik is crucial for determining the right dosage and frequency of medication. It helps healthcare professionals predict how long a drug will remain effective and how it may interact with other substances. This knowledge ensures safe and effective treatment for patients.