Which of the following is classified as a schedule IV drug?

Xanax, which is the correct answer, is classified as a Schedule IV controlled substance under the Controlled Substances Act. Schedule IV drugs are defined as having a lower potential for abuse relative to the substances in Schedules I through III, and they are commonly used for medical purposes. Xanax, which contains the active ingredient alprazolam, is primarily prescribed for anxiety and panic disorders due to its sedative properties.

In contrast, hydrocodone, codeine, and oxycodone are classified as Schedule II drugs, which indicates that they have a higher potential for abuse and dependence, despite also having accepted medical use. Schedule II drugs are subject to stricter regulations regarding prescription and dispensing. Understanding these classifications helps in recognizing the legal aspects surrounding the prescription and monitoring of controlled substances in a dental or medical practice.