receptor antagonist adrenergic antagonist 2013-08-22T16:22:29Z This is any condition in which the main influencing factor is an adrenergic antagonist, an agent that binds to but does not activate adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists, substances that have an affinity for and stimulate physiologic activity at adrenergic receptors. Adrenergic receptors are a class of G protein-coupled receptors that bind catecholamines, especially norepinephrine and epinephrine. XCO:0000336 adrenergic receptor antagonist experimental_condition_ontology jsmith