Which of the following substances is NOT classified as a CNS depressant?

Benzedrine is classified as a central nervous system (CNS) stimulant, which distinguishes it from the other options listed. CNS depressants, such as Alcohol, Xanax, and Nembutal, work by slowing down brain activity, leading to effects such as relaxation, sedation, and decreased anxiety.

Benzedrine, on the other hand, is an amphetamine. As a stimulant, it increases brain activity, which results in heightened alertness, increased energy, and potential euphoria. This fundamental difference in how the substance interacts with the nervous system is key to understanding why Benzedrine is not categorized alongside CNS depressants.

By recognizing Benzedrine's stimulating properties, one can see that it operates in contrast to the sedative effects associated with the other substances listed. This knowledge is essential for anyone studying the classification of drugs and their respective impacts on the body and mind.