Final answer:
Agonist drugs mimic neurotransmitters to enhance their effects. Examples include stimulants like caffeine and depressants like alcohol.
Explanation:
Agonist drugs are chemicals that mimic neurotransmitters at receptor sites to enhance their effects. They increase the activity of specific neurotransmitters by various mechanisms such as promoting synthesis or mimicking their actions.
Stimulants like caffeine and cocaine, and depressants such as alcohol and opioids are examples of drug categories that have agonist effects on neurotransmitter systems.
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