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Schedule II to V aboard a vessel: what actually changes
Controlled substances aboard vessels

Schedule II to V aboard a vessel: what actually changes

The short version 21 CFR 1301.25 does not distinguish by schedule when permitting controlled substances aboard. The employment and registration test, the requisition route and the two annual reports are
By Discovery Health MD
Medically reviewed by Ann Jarris MD, FACEP
Updated August 2026
7min read
Schedule II to V aboard a vessel what actually changes | Discovery Health MD

The short version

  • 21 CFR 1301.25 does not distinguish by schedule when permitting controlled substances aboard.
  • The employment and registration test, the requisition route and the two annual reports are the same for every schedule.
  • What does change is recordkeeping: Schedule II records must be kept separately from all other records.
  • Schedules III, IV and V may be kept separately or readily retrievable from ordinary business records.
  • That rule reaches a vessel medical officer through 21 CFR 1304.04(g), which applies paragraph (f) to practitioners.

Operators plan vessel medicine chests as if the schedule of a drug changes the compliance regime around it. For the most part it does not. One rule genuinely changes, it is a filing rule, and it is the one most programs have never applied.

This page separates the two. For the schedules themselves, DEA publishes the current listing[4]. For how the chest gets built, see how to stock a ship medicine chest.

The vessel exception is schedule-blind

What the rule actually says21 CFR 1301.25 permits controlled substances to be held in medicine chests, first aid packets or dispensaries aboard vessels in international trade or trade between US ports, acquired and dispensed under the general supervision of a medical officer or the master or first officer[1]. The text does not carve the permission by schedule.

So the structural questions are the same whichever schedule you carry: is there a state-licensed physician employed by the owner or operator and DEA-registered, or are you on the master requisition route. That test is set out in medical officer or master requisition.

The one rule that does change by schedule

Section 1304.04(f) splits recordkeeping by schedule, and the split is sharp[2].

Schedule Typical maritime relevance How records must be kept
Schedule II Morphine, fentanyl and similar high-potency analgesics carried for severe pain at sea Records and inventories must be maintained separately from all other records of the registrant
Schedules III, IV and V Moderate analgesics, sedatives and antitussive preparations Records may be kept separately or in a form where the information is readily retrievable from ordinary business records

Read the Schedule II row carefully. Separately from all other records is not “clearly labelled within the file”. It is a separate record set. A program that keeps one combined controlled substances ledger has not met it.

Why that rule reaches a vessel medical officer

Paragraph (f) lists manufacturers, distributors, importers, exporters and narcotic treatment programs, which is why programs assume it does not apply to them.

The line that closes the gapSection 1304.04(g) states that each registered individual practitioner required to keep records, and each institutional practitioner, shall maintain inventories and records of controlled substances in the manner prescribed in paragraph (f)[2]. A DEA-registered vessel medical officer is a registered practitioner. The Schedule II separation rule applies.

Retention does not move with the schedule either: at least two years, available for inspection and copying[2]. How the whole ledger fits together is set out in recordkeeping aboard a vessel.

Four things that do not change by schedule

The belief The position
The vessel exception only covers lower schedules False. 21 CFR 1301.25 does not distinguish by schedule when it permits controlled substances to be held aboard
Schedule changes whether you need a medical officer False. The employment and registration test in paragraph (b) is the same regardless of schedule
Only Schedule II appears in the annual reports False. Both annual reports account for controlled substances generally, purchased, dispensed or disposed of
Lower schedules can be destroyed aboard False. Part 1317 governs disposal for all schedules, and the non-retrievable standard does not soften by schedule

The disposal row is the costly one. Part 1317 governs disposal for every schedule and the non-retrievable standard does not relax for a Schedule IV sedative[3]. See disposal from a ship chest.

What this means for how you file

  1. Split the ledger at Schedule II. One record set for Schedule II, a second for III to V. This is the single change most vessel programs need to make.
  2. Keep the reporting unified. Both annual reports account for controlled substances across schedules, so the split ledger must roll up cleanly[1]. See the two annual reports.
  3. Do not let the schedule drive the security decision. Access control is judged on the program, not on a drug class.
  4. Check what you actually carry. Chest contents follow your flag state and voyage profile, and the schedule follows from the drug. Compare frameworks in medicine chest requirements by flag state.

Common questions

Does 21 CFR 1301.25 treat schedules differently?

No. 21 CFR 1301.25 permits controlled substances aboard qualifying vessels without carving the permission by schedule[1]. The employment test, the requisition route and both annual reports apply the same way. See 21 CFR 1301.25 explained.

What does change by schedule?

Recordkeeping. Section 1304.04(f) requires inventories and records of Schedule I and II substances to be maintained separately from all other records, while Schedules III, IV and V may be separate or readily retrievable from ordinary business records[2]. See recordkeeping.

Does the Schedule II separation rule apply to a vessel medical officer?

Yes. Section 1304.04(g) applies the paragraph (f) manner of keeping records to each registered individual practitioner and institutional practitioner[2]. A DEA-registered vessel medical officer falls inside that. Ask us to check your ledger.

Can lower-schedule drugs be destroyed aboard?

No. Part 1317 governs disposal for all schedules and the non-retrievable destruction standard does not soften by schedule[3]. Expired stock comes ashore. See disposal from a ship chest.

Which schedule is a given drug in?

DEA publishes the current controlled substance schedules and they are amended over time[4]. Verify against the current listing rather than a supplier catalogue. Our MedChest service checks contents against both the schedule listing and your flag requirements.

Do both annual reports cover every schedule?

Yes. Paragraphs (e) and (h) account for controlled substances purchased, dispensed or disposed of during the year without limiting by schedule[1]. A split ledger still has to roll up into one accounting. See the two annual reports.

How long are the records kept?

At least two years from the date of the record, available for inspection and copying by DEA, under 21 CFR 1304.04(a)[2]. The retention period does not vary by schedule. See Controlled Substances.

Not sure your program would survive an inspection?

We provide the DEA-registered medical officer, the registration structure, the records and both annual reports. A physician reviews your fleet and shows you exactly where the gaps are.
Medically reviewed by

Ann Jarris, MD, MBA, FACEP

CEO & Co-Founder · Board-Certified Emergency Physician
Co-founded Discovery Health MD in Seattle in 2016. Every controlled-substances program the company runs is directed by a physician. Meet the physicians →
  1. 21 CFR 1301.25, registration regarding ocean vessels, aircraft and other entities. eCFR, verified 19 August 2026.
  2. 21 CFR 1304.04, maintenance of records and inventories. Paragraphs (a), (f) and (g) read verbatim from eCFR, 19 August 2026.
  3. 21 CFR part 1317, disposal of controlled substances. eCFR.
  4. DEA Diversion Control Division, Controlled Substance Schedules. Current listing.

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