When a drug blocks reuptake or breakdown of a neurotransmitter by the action of enzymes, the drug is acting as an _____.

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An agonist is a drug that enhances the activity of a neurotransmitter by mimicking its effects or increasing its release. Blocking reuptake or breakdown of a neurotransmitter increases its availability, which can enhance its effects on the postsynaptic neuron, making the drug an agonist. Precursors are substances that the body converts into neurotransmitters, and synergists are drugs that enhance the effects of other drugs. Antagonists, on the other hand, bind to receptors without activating them, thereby blocking the activity of neurotransmitters.

When a Drug Blocks Reuptake or Breakdown of a Neurotransmitter