2 DEA Schedules and Controlled-Substance Classification
Learn how federal controlled-substance schedules are distinguished, what factors inform classification decisions, and how to verify a medication’s current federal status.
How federal scheduling works
The federal (CSA) groups controlled substances into Schedules I–V. A substance’s schedule affects the controls that apply to it. Classification considers accepted medical use, abuse potential, and the likelihood or degree of dependence when the substance is abused.
Schedule listings are updated. Verify current federal status rather than relying on memory or an older reference.
Criteria for Schedules I–V
The statutory criteria distinguish schedules using findings about medical use, abuse potential, and dependence. They are not a simple ranking of how medically useful or harmful a drug is.
requires high abuse potential, no currently accepted medical use in treatment in the United States, and a lack of accepted safety for use under medical supervision. Heroin and LSD are examples.
requires high abuse potential and currently accepted medical use, or accepted medical use with severe restrictions. Abuse may lead to severe psychological or physical dependence. Examples include oxycodone, fentanyl, and methylphenidate.
requires lower abuse potential than Schedules I and II and currently accepted medical use. Abuse may lead to moderate or low physical dependence, or high psychological dependence. Examples include buprenorphine and certain codeine combination products.
requires low abuse potential relative to and currently accepted medical use. Abuse may lead to limited physical or psychological dependence relative to . Alprazolam and diazepam are examples.
requires low abuse potential relative to and currently accepted medical use. Abuse may lead to limited physical or psychological dependence relative to . Certain low-concentration codeine preparations are examples.
Factors in classification decisions
When considering whether to control a substance or change its schedule, the Attorney General must consider . The findings required for the proposed schedule must also be met.
The are:
The substance’s actual or relative abuse potential.
Its known pharmacological effects.
Current scientific knowledge about it.
Its history and current pattern of abuse.
The scope, duration, and significance of abuse.
The risk to public health.
Its psychological or physical dependence liability.
Whether it is an immediate precursor of a controlled substance.
Verifying a medication’s status
Verify a medication by matching its exact product and formulation to current federal rules, then checking for later scheduling changes. If the result remains unclear, seek an authoritative determination.
Identify the exact product. Record the active ingredient or ingredients, strength, and dosage form. For a combination product, also record the amount of each controlled ingredient per unit or volume. A brand name alone may not identify the applicable control.
Check the current regulation. Search , especially §§1308.11–1308.15, for the substance and applicable schedule. Check whether the entry covers relevant salts, isomers, derivatives, or preparations, and whether a specific exception applies.
Check for later scheduling rules. Consider final rules published in the Federal Register after the CFR edition. The DEA controlled-substances list can help with searching, but it is not comprehensive and may list a parent chemical rather than every potentially controlled form.
Resolve uncertainty authoritatively. If the exact substance or formulation remains unclear, consult DEA’s Diversion Control Division. DEA identifies its Drug and Chemical Evaluation Section as the contact for official determinations.
Do not classify a codeine combination solely from the word “codeine” on its label. The applicable schedule can depend on the preparation’s composition and the statutory limits for the combination, so verify the exact formulation in the current regulation.
Federal scheduling may not be the complete answer for practice: state law may impose additional or stricter requirements. Confirm applicable state rules as well as federal status.