Which substance is classified in Schedule II and is frequently used in the treatment of pain?

Cocaine is classified as a Schedule II substance primarily due to its high potential for abuse, which can lead to severe psychological or physical dependence. Despite this risk, cocaine does have accepted medical uses, particularly in specific formulations for topical anesthesia in certain surgical procedures. Thus, it is recognized as a medication that can effectively manage pain in particular circumstances, making it distinct in its classification compared to other choices provided.

Ibuprofen, while effective as a pain reliever, is classified as an over-the-counter nonsteroidal anti-inflammatory drug (NSAID) and does not fall under any controlled substance schedules. Dexamethasone is a corticosteroid that has anti-inflammatory properties but is not classified as a controlled substance. Clonazepam, on the other hand, is a Schedule IV substance typically used for anxiety and seizure disorders, rather than for direct treatment of pain and is not considered a Schedule II substance.