Which of these substances is considered a CNS depressant?

Xanax is classified as a central nervous system (CNS) depressant due to its active ingredient, alprazolam, which is a benzodiazepine. This class of medications acts by enhancing the effects of a neurotransmitter called gamma-aminobutyric acid (GABA). By increasing GABA activity in the brain, Xanax effectively produces a calming effect, alleviating anxiety and inducing sedation.

In contrast, substances like LSD and mushrooms are hallucinogens that affect perception and consciousness rather than directly depressing CNS activity. Cocaine is a powerful stimulant that accelerates the central nervous system, increasing alertness and energy levels rather than inducing a depressant effect. These distinctions clarify why Xanax is the substance recognized as a CNS depressant in this context.