A drug that mimics or amplifies the effect of a neurotransmitter is called a(n):

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A drug that mimics or amplifies the effect of a neurotransmitter is called an agonist. An antagonist, on the other hand, blocks the effect of a neurotransmitter. A ligand is a molecule that binds to a receptor, which could be either an agonist or an antagonist. A receptor binder is not a commonly used term in pharmacology, but it could refer to any molecule that binds to a receptor, including both agonists and antagonists.

A Drug That Mimics or Amplifies the Effect of a Neurotransmitter