Which of the following is NOT classified as a Schedule I drug?

Buprenorphine is not classified as a Schedule I drug because it has accepted medical uses and is recognized for its ability to treat opioid addiction. Schedule I drugs are defined as substances that have a high potential for abuse, no currently accepted medical use, and a lack of accepted safety for use under medical supervision. In contrast, heroin, LSD, and methaqualone are all classified as Schedule I substances due to their high potential for abuse and lack of accepted medical use.

The classification of buprenorphine in a different schedule highlights its therapeutic potential, particularly in the field of addiction treatment, which is significant in the context of substance abuse and public health. This distinction reflects a crucial understanding of drug schedules and their implications in pharmacy practice and patient care.