Under federal law, codeine is a Schedule II, Schedule III, or Schedule V controlled substance, depending on its concentration and whether it’s combined with a nonnarcotic active ingredient. Pure codeine is Schedule II. Codeine mixed with acetaminophen or aspirin in tablet form is typically Schedule III. Low-dose codeine cough syrups fall into Schedule V. Codeine does not appear in Schedule IV at all.1eCFR. 21 CFR 1308.12 – Schedule II
When Codeine Is Schedule II
Federal law lists codeine by name in Schedule II of the Controlled Substances Act, the category reserved for drugs with high abuse potential that can cause severe physical or psychological dependence.1eCFR. 21 CFR 1308.12 – Schedule II This tier covers pure codeine powder, bulk codeine used in pharmaceutical manufacturing, and any finished product where the codeine concentration exceeds the thresholds that would qualify it for a lower schedule. Any codeine formulation that lacks a nonnarcotic active ingredient in a recognized therapeutic amount also defaults to Schedule II, regardless of the intended use.
Schedule II placement carries the tightest prescribing rules. Federal law flatly prohibits refilling a Schedule II prescription.2Office of the Law Revision Counsel. 21 USC 829 – Prescriptions A practitioner may issue multiple separate prescriptions at once covering up to a 90-day supply, but each one must include the earliest date on which a pharmacy may fill it, and the prescriber must determine that doing so does not create an undue risk of diversion.3eCFR. 21 CFR 1306.12 – Refilling Prescriptions; Issuance of Multiple Prescriptions
When Codeine Is Schedule III
When codeine is blended with a nonnarcotic active ingredient in recognized therapeutic amounts and kept below specific concentration limits, the resulting product drops to Schedule III.4eCFR. 21 CFR 1308.13 – Schedule III The most common examples are tablets combining codeine with acetaminophen (such as Tylenol with Codeine #3) or with aspirin. The nonnarcotic ingredient must actually contribute therapeutic value; the regulation requires a “recognized therapeutic amount,” not filler.
To qualify as Schedule III, the product must contain no more than 1.8 grams of codeine per 100 milliliters, or no more than 90 milligrams per individual dosage unit.4eCFR. 21 CFR 1308.13 – Schedule III Exceeding either limit pushes the product back up to Schedule II.
Prescribing is noticeably more flexible at this tier. A Schedule III codeine prescription can be refilled up to five times, and those refills must all be dispensed within six months of the original issue date.5eCFR. 21 CFR 1306.22 – Refilling of Prescriptions After six months or five refills, whichever comes first, the patient needs a new prescription.
When Codeine Is Schedule V
Schedule V is the least restrictive federal tier, and for codeine it covers primarily liquid cough suppressants containing very small amounts of the narcotic. To qualify, a product must contain no more than 200 milligrams of codeine per 100 milliliters or per 100 grams, and it must include one or more nonnarcotic active medicinal ingredients in sufficient proportion to give the product therapeutic value beyond what the narcotic alone provides.6eCFR. 21 CFR 1308.15 – Schedule V The classic example is a codeine cough syrup that also contains guaifenesin or a decongestant.
Federal law permits a pharmacist to dispense certain Schedule V products without a prescription when strict conditions are met, including an age minimum of 18, ID verification, quantity caps per 48 hours, and a bound logbook.7eCFR. 21 CFR 1306.26 – Dispensing Without Prescription In practice, most states override this by requiring a prescription for all codeine products regardless of federal schedule. Check your state’s rules before assuming a codeine cough syrup can be purchased over the counter.
Why Codeine Skips Schedule IV
Readers sometimes expect a neat progression from Schedule II through III, IV, and V. Codeine doesn’t follow that path. No codeine formulation appears in Schedule IV under federal law. The regulations list codeine products only in Schedules II, III, and V, jumping over the fourth tier entirely. Schedule IV generally covers drugs like benzodiazepines and sleep medications that have a lower abuse profile than Schedule III substances. The way Congress structured the Controlled Substances Act, codeine combination products either qualify for Schedule III under its specific concentration limits or drop to Schedule V for very low-dose preparations. There is no codeine category that fits Schedule IV criteria.
How the Concentration Numbers Decide the Schedule
The line between the three tiers comes down to exact milligram measurements. These thresholds aren’t guidelines. Exceeding them by any amount bumps a product into the next higher schedule.
- Schedule III ceiling: no more than 1.8 grams of codeine per 100 milliliters, or no more than 90 milligrams per individual dosage unit, with at least one nonnarcotic active ingredient at a recognized therapeutic dose.4eCFR. 21 CFR 1308.13 – Schedule III
- Schedule V ceiling: no more than 200 milligrams of codeine per 100 milliliters or per 100 grams, with at least one nonnarcotic medicinal ingredient in sufficient proportion to provide independent therapeutic value.6eCFR. 21 CFR 1308.15 – Schedule V
- Schedule II default: any codeine product that exceeds the Schedule III limits, or any codeine formulation missing the required nonnarcotic active ingredient, falls into Schedule II.1eCFR. 21 CFR 1308.12 – Schedule II
Notice the gap. A Schedule III product can hold up to 1,800 milligrams per 100 milliliters, while Schedule V caps out at 200 milligrams per 100 milliliters. That nine-to-one ratio is why Schedule III codeine tablets are used for moderate pain and Schedule V liquids are reserved for cough suppression. The nonnarcotic ingredient requirement is as critical as the concentration cap. A product containing exactly 100 milligrams of codeine per 100 milliliters but lacking any other active medicinal ingredient is still Schedule II.
What the Schedule Changes in Practice
The schedule determines refill rules, ordering paperwork, storage, and criminal penalties. The refill differences are covered above. Federal trafficking penalties scale sharply with the tier:
- Schedule II codeine: a first offense carries up to 20 years in federal prison, rising to a 20-year minimum with a possible life sentence if death or serious injury results. Individual fines reach up to $1 million.8Drug Enforcement Administration. Federal Trafficking Penalties
- Schedule III codeine: a first offense carries up to 10 years in prison, rising to 15 years if death or serious bodily injury results. Individual fines go up to $500,000.9Office of the Law Revision Counsel. 21 USC 841 – Prohibited Acts A
- Schedule V codeine: a first offense carries up to one year in prison and a fine of up to $100,000 for an individual.9Office of the Law Revision Counsel. 21 USC 841 – Prohibited Acts A
The same base chemical, codeine, carries a maximum first-offense sentence anywhere from one year to 20 years depending solely on concentration and formulation.
State Law Can Override the Federal Schedule
Federal scheduling sets the floor, not the ceiling. Most states have adopted their own controlled substance schedules, and many place codeine under tighter restrictions than federal law requires. The most common divergence involves Schedule V cough syrups: while federal law allows pharmacists to dispense certain Schedule V codeine products without a prescription, the majority of states now require a prescription for every codeine formulation regardless of concentration. Some states have reclassified codeine cough syrups to Schedule III or higher under their own schedules. A product that is legally Schedule V federally may be Schedule III in your state, carrying all the prescribing and record-keeping requirements that come with the higher tier. Check your state’s controlled substance schedule rather than relying on the federal classification alone.