Pharmacokinetics The study of the factors that influence the movement of drugs throughout the body. This includes the absorption, distribution, localization in tissues, biotransformation, and excretion of drugs. Drug therapy's general characteristics Principles of drug uptake and distribution Pharmacodynamics are the study of how drugs work and how they affect each other. A drug must be absorbed and distributed throughout the body for it to be effective. Different drugs can be absorbed by the intestines at different rates when taken orally, with some being absorbed more quickly than others. Even drugs that are absorbed quickly can be made in ways that slow the rate of absorption and allow them to be effective for up to 12 hours. Although dosage calculation is more important, drugs that are administered either intravenously or intramuscularly avoid problems with absorption.
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