Which drug is considered a CNS depressant?

Xanax, which is the correct answer, is classified as a central nervous system (CNS) depressant. CNS depressants primarily work by slowing down brain activity, which can lead to effects such as relaxation, drowsiness, and sedation. Xanax, the brand name for the drug alprazolam, belongs to the benzodiazepine class, which is well-known for its sedative and anxiolytic properties. It is often prescribed to manage anxiety disorders and panic disorders due to its calming effects on the brain.

In contrast, the other substances mentioned do not fall under the category of CNS depressants. MDMA (ecstasy) is primarily known for its empathogenic effects and can increase energy and mood. LSD is a potent hallucinogen that alters perception and can lead to significant changes in consciousness. Cocaine is a powerful stimulant that increases alertness and energy, often leading to enhanced feelings of euphoria rather than sedation. Each of these substances operates on the CNS differently, highlighting why Xanax is the only CNS depressant among the options provided.