Drug-Body Interactions. Pharmacodynamics = The actions of drug on the body Pharmocokinetics= The actions of the body on the drug. Pharmacodynamic Principles. A. Types of Drug-Receptor interactions Agonists = Bind to, and activate the receptor.
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A. Types of Drug-Receptor interactions
e.g.: Opening of an ion channel or activation of enzyme activity.
e.g.: Atropine, an acetylcholine receptor blocker
B. Duration of Drug Action
C. Receptors and Inert binding sites