What substances are classified as Schedule I drugs?

Schedule I drugs are characterized by their lack of accepted medical use and their high potential for abuse. This classification indicates that these substances are considered to pose significant risks to public health and safety due to their high likelihood of addiction and abuse, making them subject to the most stringent regulations under drug enforcement laws. The classification serves as a legal framework to prevent their production, distribution, and consumption outside of tightly controlled research settings.

While some other options reference medical uses or lower potentials for abuse, Schedule I drugs are strictly delineated by their absence of recognized medical applications and substantial risks, reinforcing their position at the top of the drug classification system, where they face the most severe legal restrictions.