DEA Controlled Substance Compliance for Veterinary Practices: Logs, Audits, and Drug Storage

DEA Drug Schedules Relevant to Veterinary Practice

Veterinary practices routinely work with controlled substances across Schedules II through V. Schedule II drugs used in veterinary medicine include morphine sulfate, hydromorphone, oxymorphone, and fentanyl (injectable). Schedule III includes ketamine (the most commonly used veterinary anesthetic), buprenorphine (Buprenex, Simbadol), and anabolic steroids. Schedule IV includes diazepam, alprazolam, butorphanol (Torbugesic), and phenobarbital (used for seizure control in dogs). Schedule V is less commonly used in veterinary settings. Pentobarbital (used for euthanasia) is a Schedule II drug — every euthanasia must be logged against your perpetual inventory. Most practices purchase pentobarbital through their wholesale distributor using DEA Form 222 or the electronic CSOS system.

DEA Form 222 and CSOS for Schedule II Ordering

To order Schedule II controlled substances, veterinary practices must use DEA Form 222 (a triplicate paper form) or the electronic equivalent through the DEA's Controlled Substance Ordering System (CSOS). CSOS requires a digital certificate purchased through the DEA — most practices with significant Schedule II volume should enroll. Each Form 222 order must specify the exact drug, form, strength, and quantity. The distributor retains one copy, the DEA receives one copy, and the practice retains the third for its records. Retain completed Form 222 records for a minimum of 2 years. Your veterinary pharmaceutical distributor — MWI Veterinary Supply, Henry Schein Animal Health, or Patterson Veterinary — can walk you through their specific ordering process for Schedule II substances.

Daily Dispensing Logs and Perpetual Inventory

For Schedule II substances, DEA regulations require a perpetual inventory — a running log of every purchase, every dose dispensed or administered, and the resulting running balance. The log must include: date, patient name and species, client name, drug name/strength/dosage form, amount dispensed or administered, the balance remaining, and the initials of the dispensing or administering DVM. For Schedule III–V substances, a dispensing log is required by most state veterinary boards even where DEA regulations do not explicitly mandate a perpetual inventory. Many practice management systems (including IDEXX Cornerstone and ezyVet) include controlled substance logging modules that generate these records automatically when a drug is dispensed through the patient record — use them.

Biennial Physical Inventory Requirements

The DEA requires every registered practitioner to conduct a complete physical inventory of all controlled substances on hand every two years (within 2 years of either the previous inventory or initial registration date). The biennial inventory must be conducted on any business day, must record the exact count of every Schedule II substance and an estimated count (or exact count) of Schedule III–V substances, and must be signed by the DVM registrant. Retain the completed inventory document for a minimum of 2 years — indefinitely is better practice. If your actual on-hand quantities do not reconcile with your perpetual inventory, investigate and document the discrepancy before the next audit cycle.

Reporting Theft and Significant Loss

Any theft or significant loss of controlled substances must be reported to the DEA within one business day of discovery using DEA Form 106, filed online at deadiversion.usdoj.gov. Also notify your local police department and state veterinary board. Significant loss includes unexplained inventory discrepancies that cannot be resolved through log review. Do not wait to see if the drugs turn up — delayed reporting is itself a violation. Staff diversion (an employee stealing drugs) is the most common source of unexplained losses in veterinary practices. Consider requiring two-person verification for controlled substance counts at the beginning and end of each shift.

Preparing for a DEA Inspection

DEA Diversion Investigators conduct unannounced inspections of veterinary registrants, often triggered by ordering pattern anomalies, complaints, or routine geographic sweeps. To be inspection-ready at all times: keep your DEA certificate posted in a visible location in the practice, maintain your controlled substance safe locked whenever not in active use, ensure your dispensing logs are current through the most recent business day, reconcile your perpetual inventory monthly, retain all Form 222 copies and purchase invoices for 2+ years, and ensure your biennial inventory is documented and signed. During an inspection, remain professional and cooperative — do not refuse access to records. Have your DVM managing member or practice owner present if possible.

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