Which of the following is an example of a Schedule II controlled substance?

Oxycodone is classified as a Schedule II controlled substance due to its potential for abuse and the risk of severe psychological or physical dependence. Schedule II substances are recognized for having accepted medical uses, but they also carry a higher level of regulation because of their potential to be misused. Oxycodone is commonly prescribed for managing moderate to severe pain and is known for its potency and effectiveness, which contributes to its tight control under federal and state regulations.

In contrast, other options listed, such as ibuprofen and aspirin, are considered non-controlled substances, used primarily for pain relief and inflammation without the same level of abuse potential. Diphenhydramine, an antihistamine, is also not classified as a controlled substance and is commonly used in over-the-counter medications. Recognizing the classification of controlled substances, particularly those that fall under Schedule II, is crucial for understanding drug regulation and the implications of prescribing and dispensing certain medications.