Which of the following is NOT classified as a Schedule V drug?

A Schedule V drug is defined by the lower potential for abuse relative to drugs classified in Schedules I-IV, and they often have accepted medical uses. The correct answer indicates that codeine, while being a controlled substance, does not fall within the Schedule V category. Instead, it is classified as a Schedule II or III drug, depending on its formulation and concentration when combined with other ingredients.

Xanax (alprazolam) and Valium (diazepam) are classified as Schedule IV drugs, indicating that they have a lower potential for abuse than Schedule II or III drugs but are still monitored. Tramadol is also classified as a Schedule IV drug, reflecting similar concerns about misuse.

Thus, the distinction lies in the classification of codeine, making it the correct identification of a substance that is not classified as Schedule V. This highlights the specific legal framework surrounding controlled substances and their classifications.