A drug that blocks the effect of a neurotransmitter is called a(n):

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An antagonist is a drug that blocks the effect of a neurotransmitter by binding to the receptor site without activating it, preventing the neurotransmitter from binding to and activating the receptor. A ligand is a molecule that binds to a receptor site, which can be either an agonist or an antagonist. A receptor binding agent refers to any compound that binds to a receptor site, regardless of whether it activates or blocks it. An agonist is a drug that mimics or enhances the effect of a neurotransmitter by binding to and activating the receptor site.

A Drug That Blocks the Effect of a Neurotransmitter Is