Which of the following is NOT among the five drug classes identified?

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In this context, substances of abuse are grouped into five categories by how they affect the brain and behavior: narcotics, depressants, stimulants, hallucinogens, and cannabis. Antibiotics are medicines used to treat bacterial infections and do not belong to this classification framework. That’s why antibiotics is the correct option for not being among the five drug classes identified. The other choices—narcotics, depressants, and stimulants—are standard categories within this framework, with each group covering drugs known for specific kinds of effects on mood, CNS activity, or function.