Which of the following drugs is categorized as a Schedule IV drug?

Valium, also known by its generic name diazepam, is categorized as a Schedule IV drug under the Controlled Substances Act. Schedule IV substances are characterized by having a lower potential for abuse compared to drugs in higher schedules (such as Schedule III or II), but they can still lead to limited physical or psychological dependence. Valium is primarily used to treat conditions such as anxiety, muscle spasms, and seizures, and it is recognized for its therapeutic effects in a controlled medical setting.

The other substances listed fall under different categories based on their potential for abuse and accepted medical use. For example, Tylenol (acetaminophen) is not a controlled substance and is generally recognized for its safety and efficacy as a pain reliever. Oxycodone is classified as a Schedule II drug due to its higher potential for abuse and addiction. Heroin, on the other hand, is a Schedule I drug, indicating it has a high potential for abuse and is not accepted for medical use in the United States. This classification framework helps in understanding the risks associated with each substance and the regulations that govern their use.