Controlled substances log: veterinary compliance guide

Controlled-substances compliance is one of the few areas of clinic management where an honest mistake can result in regulatory action. Keeping a clear, reconciled log is not complicated — but it does require consistent habits and a process that everyone on the team understands and follows.

What belongs in the log

Every transaction involving a controlled substance needs an entry — not just dispensing events. That means receipts from your supplier, internal transfers between storage locations, any waste or destruction, and any quantity adjustment you discover during a count. The goal is an unbroken chain from the moment a substance enters the clinic to the moment it leaves.

Each entry should capture: the date and time, the substance name and concentration, the quantity in a consistent unit (millilitres, tablets, or milligrams — pick one and stick with it), the patient and client if applicable, the clinician who administered or authorised it, and the running balance after the transaction.

A log that records administration but omits supplier receipts, or that records waste informally in the margin, will not hold up during an audit. Build the habit of logging all categories from the start.

Reconciliation: how often and how

The most common advice is to count and reconcile at each shift change — or at minimum daily. Infrequent counts let discrepancies accumulate, making them far harder to trace back to their source.

Reconciliation means physically counting what is on the shelf and comparing it to the running balance in your log. Any difference is a discrepancy and needs a written explanation — even if the explanation is as mundane as “bottle dropped during morning prep, 2 ml waste, disposed per protocol.” Unexplained discrepancies, even small ones, are what draw scrutiny during an inspection.

Designate two people for each count when possible, so that one person counts and the other verifies. A single-person count with no witness is harder to defend if a question arises later.

Common record-keeping pitfalls

Several habits tend to create compliance problems over time:

Rounding entries. It can feel easier to log “0.5 ml” than “0.48 ml,” but rounded entries make reconciliation imprecise and create cumulative drift. Log actual quantities.

Delayed entries. Logging at the end of a busy day rather than at the time of administration increases the risk of inaccurate doses and misremembered details. Train staff to log at the point of care.

Informal waste documentation. Waste needs to be witnessed, recorded, and handled according to your jurisdiction’s requirements. A verbal acknowledgement between two staff members is not a record.

Unsecured storage between procedures. Drugs should return to locked storage between uses, not sit on a counter while the team finishes with one patient and moves to the next.

Missing supplier receipts. If you cannot reconcile purchases to use to balance, you have gaps. Keep every delivery receipt and record the opening balance immediately on receipt.

Audit readiness

Regulatory inspections in most jurisdictions focus on whether your records are complete, whether the running balance matches the physical count, and whether discrepancies have been explained and reported appropriately. The bar is not perfection — it is demonstrable diligence.

Keep at least two years of records readily accessible, though your jurisdiction may require a longer retention period. Confirm the exact requirement with your local regulatory body, as controlled-substance rules vary significantly by country, state, or province and change over time.

When an inspector visits, you should be able to walk them through: where substances are stored, who has access, how the log is maintained, how discrepancies are handled, and where your destruction records are kept. If you cannot answer those questions in five minutes, your process needs work.

Activet includes a built-in controlled-substances log that tracks balances automatically alongside patient and clinical records — so administration entries link directly to the encounter rather than requiring a separate manual step.

Connecting compliance to broader inventory practice

A well-maintained controlled-substances log sits inside your broader inventory discipline. If you are also managing general pharmaceutical stock with first-expired/first-out (FEFO) rotation, there is a natural overlap in how you receive, count, and reconcile. For the wider inventory picture, see our guide to veterinary inventory management and FEFO.

End-of-day reconciliation — across all payment types and invoice lines — is also a natural time to review whether all administered substances were correctly charged and logged. The day-end reconciliation guide covers that process in more detail.

For practices thinking about their overall compliance posture alongside financial controls, the Activet features overview shows how both areas are handled in a single system.