The study of how a drug interacts with a receptor is termed:

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Pharmacodynamics is the study of the relationship between the drug concentration at the site of action (receptor) and the resulting effect, including the dose response curve, pharmacological potency, and efficacy. Pharmacology is the broader study of drugs and their effects in the body, including pharmacokinetics (drug absorption, distribution, metabolism, and excretion) and toxicology. Molecular physiology is the study of how molecules function in biological systems, but it is not specific to drugs or their interactions with receptors.

The Study of How a Drug Interacts with a Receptor