Which compound is considered a Schedule III medication when combined with codeine?

The correct answer is Empirin #3, which is a combination of aspirin and codeine. According to the Controlled Substances Act, compounds that contain codeine can fall into different schedules depending on the amount of codeine present and the presence of other active ingredients. Specifically, when codeine is combined with other non-narcotic substances like aspirin, as seen in Empirin #3, the mixture is classified as a Schedule III medication if the quantity of codeine does not exceed a certain threshold.

This classification reflects the potential for abuse of these medications, as they can still produce narcotic effects but are considered less potent than those in higher schedules. Other options listed, such as Percocet and Vicoprofen, contain oxycodone and hydrocodone, respectively, which are classified differently. Dalmane, on the other hand, is a benzodiazepine and does not contain any opioids and thus doesn't relate to the question about codeine.