Which of the following is not a benzodiazepine?

Carisoprodol, commonly known by its brand name Soma, is not a benzodiazepine. Instead, it is classified as a muscle relaxant. Benzodiazepines, such as Lorazepam, Alprazolam, and Clonazepam, all function primarily as anxiolytics, sedatives, or hypnotics and share a similar chemical structure and mechanism of action, primarily enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) in the brain.

Carisoprodol acts in a different manner, primarily by interrupting neuronal communication within the reticular formation and spinal cord, which contributes to its muscle-relaxing properties. This distinction is crucial in pharmacology and toxicology, especially for professionals involved in drug recognition and abuse prevention, as it helps identify the specific risks and uses of various substances.