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Pharmacodynamics refers to the study of the biochemical and physiological effects of drugs on the body, including how drugs interact with their target receptors to produce a response, the mechanisms of drug action, and the relationship between drug concentration and effect. It involves understanding how drugs influence the body's systems and processes, such as the nervous, cardiovascular, and immune systems, to achieve therapeutic outcomes or produce side effects. Pharmacodynamics also explores factors that can affect a drug's efficacy, including drug-drug interactions, genetic variations, and individual differences in drug response.