Antagonist
Definition
A drug that binds to a receptor but does not activate it, instead blocking the receptor and preventing agonists from producing their effect. Competitive antagonists can be overcome by higher concentrations of agonist, while non-competitive antagonists cannot.
Example
Losartan is an angiotensin II receptor antagonist (ARB) that blocks the vasoconstricting effect of angiotensin II, lowering blood pressure.
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