Euthanasia Solution Handling & Records in a Veterinary Practice (2026)

Euthanasia solution is one of the most consequential drugs a veterinary practice keeps — and one of the most scrutinized. It’s a controlled substance, it’s used in emotionally heavy moments where the paperwork is easy to skip, and the doses are large enough that a small logging habit gone wrong shows up as a real discrepancy. Handled well, it’s routine. Handled loosely, it’s exactly the kind of gap an inspection surfaces.

This guide covers how to store, log, witness, reconcile, and dispose of pentobarbital-based euthanasia solution the way the controlled-substance rules require.

First: know your product’s schedule

The rules that apply depend on the drug’s schedule, and euthanasia solutions are a place practices get this wrong.

Pentobarbital-only euthanasia products are commonly Schedule II — the tightest controls.
Some combination euthanasia solutions (for example, those combining pentobarbital with another agent such as phenytoin) are classified as Schedule III.

That distinction changes how the drug has to be ordered and how its records are kept — Schedule II requires the Form 222 / CSOS ordering channel and records kept separate from other schedules. Before anything else, confirm the exact schedule of the specific euthanasia product on your shelf from its labeling, and classify it correctly in your records. A Schedule II euthanasia solution logged and ordered as if it were lower-schedule is a foundational error that everything downstream inherits.

Storage and security

Euthanasia solution belongs under the same physical security as your other controlled substances — arguably more attention, given both its schedule and its abuse potential.

Store it in the securely locked, substantially constructed safe or cabinet, kept locked except during active access.
Keep only the quantity you reasonably need on hand.
Limit access to the minimum number of authorized staff.
Never leave it unattended on a counter, crash cart, or in an exam room during a procedure — the sensitive setting is exactly when it tends to get set down and forgotten.

Logging every use — including the hard parts

The controlled-substance log for euthanasia solution follows the same rules as any other controlled drug, but two things make it error-prone: large and variable doses, and the emotional context that makes staff want to handle the record “later.”

Every use should be recorded immediately, capturing:

Date
Patient (and owner, per your practice’s record standard)
Amount administered
Amount wasted, if the full drawn volume wasn’t used
Running balance after the entry
The person responsible, and the witness to any waste

The single most common euthanasia-log problem is the partial dose: a volume is drawn based on estimated weight, less is used, and the remainder is discarded without being recorded as witnessed waste. On a large-volume drug, that unrecorded difference is what turns a reconciliation from “balanced” to “off.” Record the amount administered and the amount wasted as separate, explicit figures, every time.

Witnessing waste

Waste of euthanasia solution should be witnessed and documented by a second authorized person. The witness isn’t a formality — it’s the control that makes the waste entry credible and keeps a large-volume drug from becoming an easy source of diversion. Build the witness step into the procedure so it happens at the moment of waste, not reconstructed afterward from memory.

Free download: Euthanasia handling touches storage, logging, witnessing, reconciliation, and disposal all at once. Our DEA Self-Audit Checklist checks every one of those categories as a self-scoring worksheet. Get the free Self-Audit Checklist →

Reconciliation

Because euthanasia solution is high-volume and high-sensitivity, it rewards frequent reconciliation. Periodically — many practices do this at set intervals rather than waiting for the biennial inventory — physically count what’s on hand and confirm it matches the running balance in the log.

When the count doesn’t match, treat it as a signal, not a rounding error: recount, check the math, look for an unrecorded partial-dose waste, and review recent access. Catching and resolving a small discrepancy early is how you keep it from compounding into a large, unexplained one.

Disposal of expired euthanasia solution

Expired or unusable euthanasia solution is disposed of like any other controlled substance — and, given its nature, with particular care:

Segregate it from working stock and mark it clearly.
Keep it secured and recorded until it’s gone — expired doesn’t mean unaccounted for.
Dispose lawfully through a reverse distributor, a lawful return, or witnessed on-site destruction that renders it non-retrievable.
Never pour it down a drain, flush it, or place it in the trash.
Document the disposal and keep the records.

Records retention

Keep euthanasia-solution records — logs, inventories, disposal documentation, and, for Schedule II product, the separate Schedule II records and Form 222s — for at least two years, and longer where your state requires. Schedule II euthanasia records must be kept separate from other records.

Frequently asked questions

Is euthanasia solution a controlled substance? Yes. Pentobarbital-based euthanasia solutions are controlled — commonly Schedule II for pentobarbital-only products, and Schedule III for some combination products. Confirm your specific product’s schedule.

How should partial doses of euthanasia solution be recorded? Record the amount administered and the amount wasted as separate figures, with the waste witnessed and documented by a second authorized person. Unrecorded partial-dose waste is the most common source of euthanasia-log discrepancies.

Does euthanasia-solution waste need a witness? Yes — waste should be witnessed and documented by a second authorized person, at the moment of waste.

How do I dispose of expired euthanasia solution? Through a reverse distributor, a lawful return, or witnessed on-site destruction that renders it non-retrievable — never by flushing or trashing it. Document the disposal and keep the records.

How long do I keep euthanasia-solution records? At least two years, with Schedule II records kept separate from other records, and longer where your state requires it.

Make the sensitive drug the well-documented one {#lead-magnet}

Euthanasia solution is where good intentions and bad paperwork collide most often — the moment is hard, the dose is variable, and the record is the easiest thing to defer. A written procedure that puts logging and witnessing at the moment of use is what keeps this drug clean in your records.

Run the free DEA Self-Audit Checklist to see whether your euthanasia handling — storage, logging, witnessing, reconciliation, and disposal — would hold up. And when you want the procedures and logs built for you, the Vet Compliance HQ DEA Controlled Substance Compliance System includes the administration, witnessing, waste, and disposal SOPs and the logs that keep every dose accounted for.

Get the free DEA Self-Audit Checklist →

Vet Compliance HQ provides educational compliance resources for veterinary practices. This article is not legal advice. DEA and state requirements change and vary by state — verify current requirements, and the schedule of your specific euthanasia product, with the DEA and your state veterinary board.