adrenergic antagonist
An agent that binds to but does not activate adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists.
histamine antagonist
Histamine antagonists are the drugs that bind to but do not activate histamine receptors, thereby blocking the actions of histamine or histamine agonists.
antiparkinson drug
A drug used in the treatment of Parkinson's disease.
muscarinic antagonist
A drug that binds to but does not activate muscarinic cholinergic receptors, thereby blocking the actions of endogenous acetylcholine or exogenous agonists.
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