Which of the following drugs may be included in schedule III?

Hydrocodone with aspirin is classified as a Schedule III drug under the Controlled Substances Act. Schedule III drugs are those that have a moderate potential for abuse, lower than that of Schedule I and II substances, and that have accepted medical uses in the United States. Hydrocodone, when mixed with other non-narcotic medications, falls under this category, as it is used for pain relief while also having a lower abuse potential compared to its pure form.

In contrast, Xanax is classified as a Schedule IV drug due to its lower potential for abuse relative to Schedule III drugs. Heroin and LSD are both classified as Schedule I drugs, which means they are considered to have a high potential for abuse and have no accepted medical use in treatment in the United States. This is essential to understand in the context of pharmacology and drug scheduling, as it dictates how these substances are regulated and controlled within the healthcare system.