Which schedule includes drugs like heroin, ecstasy, and LSD?

Schedule I drugs are classified as substances that have a high potential for abuse and no accepted medical use in the United States. This category includes drugs like heroin, ecstasy (MDMA), and LSD (lysergic acid diethylamide). These substances are deemed to be particularly dangerous, and their use is strictly prohibited except for specific research settings under tightly regulated conditions.

The classification reflects not only the abuse potential but also the lack of accepted safety for use, even under medical supervision. In contrast, the other schedules include substances that either have recognized medical uses or lower potential for abuse, which is why they do not include heroin, ecstasy, or LSD.