DEA: Definition of Controlled Substance Schedules

Explanation of DEA Controlled Substance Schedules The drugs and other substances that are considered controlled substances under the Controlled Substance Act (CSA) are divided into five schedules. A listing of the substances and their schedules is found in the DEA regulations.  A controlled substance is placed in its respective schedule based on whether it has a currently accepted medical use in treatment in the United States and its relative abuse potential and likelihood of causing dependence. Some examples of controlled substances in each schedule are outlined below. Schedule I Controlled Substances Substances in this schedule have a high potential for [...]

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