A drug that binds to a receptor site that elicits an opposite effect to that observed when an endogenous neurotransmitter binds is referred to as a(n):

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An inverse agonist is a drug that binds to the same receptor site as an endogenous neurotransmitter but produces the opposite effect. In contrast, a competitive antagonist binds to the same receptor site as the endogenous neurotransmitter but does not produce an effect. A partial antagonist produces a weaker effect than a full antagonist, and an allosteric agonist binds to a different site on the receptor and enhances the effect of the endogenous neurotransmitter.

A Drug That Binds to a Receptor Site That Elicits