These drugs are central nervous system depressants, including alcohol, benzodiazepines and barbiturates. They bind to GABA receptors and produce sedation. What is the correct drug category?

• A. Depressants/Sedative-hypnotics
• B. Stimulants
• C. Hallucinogens/Dissociatives
• D. Cannabinoids/cannabinols

Answer: (A)

These substances are central nervous system depressants that work by enhancing inhibitory signaling in the brain. Alcohol, benzodiazepines, and barbiturates all interact with GABA receptors, the main inhibitory system in the CNS. By modulating these receptors, they increase chloride ion flow when GABA binds, making neurons more negatively charged and less likely to fire. This strengthens inhibition, producing calming, sedative, and sleep-inducing effects. That’s why they’re classified as depressants or sedative-hypnotics.

Stimulants, in contrast, raise CNS activity and wakefulness. Hallucinogens/dissociatives primarily alter perception and thought, not simply dampen brain activity. Cannabinoids have their own distinct effects mediated largely through cannabinoid receptors.