The DEA Biennial Inventory Checklist

Updated 2026-06-07

What the biennial inventory is

Every DEA registrant that handles controlled substances must take a complete physical inventory of everything on hand at least once every two years. The requirement lives in 21 CFR 1304.11(c): after the initial inventory, "the registrant shall take a new inventory of all stocks of controlled substances on hand at least every two years."

This is different from your day-to-day dispensing log. The log is a running record of what came in and went out. The biennial inventory is a point-in-time snapshot: on one specific date, you count every controlled substance physically in the pharmacy and write it down. The two records should reconcile — and when an inspector compares them, gaps between the log and the count are exactly what they look for.

The inventory must be a complete and accurate record of all controlled substances on hand, maintained in written, typewritten, or printed form at the registered location (21 CFR 1304.11(a)). A pile of sticky notes or a count that lives only in someone’s head does not satisfy the rule.

When to take it

The deadline is simple: within two years of your last inventory. There is no fixed calendar date in the federal rule — the clock runs from whenever you took the previous one. If your last biennial inventory was dated March 15, 2025, the next one is due by March 15, 2027.

One detail trips people up. The inventory may be taken either as of the opening of business or as of the close of business on the inventory date, and the record must say which. An inventory without that notation is incomplete on its face — it’s one of the easiest things for an inspector to spot.

Practical advice: pick a recurring anchor date you will not miss (the first Monday of a slow month works well), put it on the calendar two years out the day you finish each inventory, and set a reminder 30 days ahead. Most missed biennials are not negligence — they are a date nobody wrote down.

What to record for each substance

For controlled substances in finished form, 21 CFR 1304.11(e) requires four data elements for each substance:

• The name of the substance
• Each finished form of the substance (for example, 10-milligram tablet)
• The number of units or volume of each finished form in each commercial container (for example, 100-tablet bottle)
• The number of commercial containers of each such finished form

Exact counts vs. estimates

For opened commercial containers, the counting standard depends on the schedule. Schedule I and II substances require an exact count or measure of the contents. For Schedule III, IV, and V substances, an estimated count or measure is allowed — unless the container holds more than 1,000 tablets or capsules, in which case an exact count is required even for the lower schedules (21 CFR 1304.11(e)).

In practice: count every open CII bottle pill by pill. For an open bottle of a Schedule IV, a good-faith estimate is acceptable — but if you stock 1,000-count bottles, those get exact counts regardless of schedule.

How the records must be kept

The recordkeeping rules are in 21 CFR 1304.04. Every inventory and record must be kept by the registrant and be available for inspection for at least two years from the date of the inventory or record.

Separation matters as much as retention. Inventories and records of Schedule I and II substances must be maintained separately from all other records of the registrant. Schedule III–V records may be kept either separately or in a form where the required information is readily retrievable from your ordinary business records. "Readily retrievable" has a real definition (21 CFR 1300.01): records that can be separated out from all other records in a reasonable time, or that are visually identifiable — asterisked, redlined, or otherwise marked apart from other items.

A common failure mode is a single combined controlled-substance binder where CII pages sit interleaved with CIII–V pages. Keep the Schedule II inventory as its own document.

Florida pharmacies have a state layer on top of this — see the companion guide on controlled-substance log requirements in Florida, where the practical retention clock is four years, not two.

The checklist

Condensed and copy-ready. Run down this list on inventory day:

1. The inventory date is within two years of the prior inventory’s date.
2. The record states whether the count was taken at the opening or the close of business that day.
3. Every controlled substance physically on hand is included — shelf stock, the safe, the quarantine bin, and anything awaiting reverse distribution.
4. Each substance lists: name, finished form, units or volume per commercial container, and number of containers.
5. Open Schedule I/II containers have exact counts.
6. Open Schedule III–V containers have estimates — except containers over 1,000 tablets or capsules, which have exact counts.
7. The record is written, typewritten, or printed — not informal notes.
8. The Schedule II inventory is maintained separately from all other records.
9. Schedule III–V records are separate or readily retrievable.
10. The completed inventory is dated, signed by the person who took it (best practice — the rule requires the date and the opening/close notation), and filed at the registered location for at least two years.

What inspectors flag

The same handful of findings come up again and again. An inventory with no date, or no opening/close-of-business notation. Schedule II records commingled with everything else. A biennial inventory that is older than two years. Counts that don’t reconcile against the dispensing log — which usually means the log has gaps, not that drugs are missing, but the inspector can’t tell the difference and neither can you.

None of these are hard to prevent. All of them are hard to explain after the fact.

Questions pharmacists actually ask

How often is the biennial inventory required?

At least every two years, measured from the date of your previous inventory (21 CFR 1304.11(c)). States can mirror or tighten this — Florida’s s. 893.07(1)(a) also requires the inventory every two years.

Is there a specific DEA form for the biennial inventory?

No. The regulation does not prescribe a form — it prescribes content. Any written, typewritten, or printed record satisfies 21 CFR 1304.11(a) as long as it contains the required data elements for each substance and notes whether it was taken at the opening or close of business.

When can I estimate a count instead of counting exactly?

Only for opened containers of Schedule III, IV, and V substances — and only if the container holds 1,000 tablets or capsules or fewer. Opened Schedule I and II containers always require an exact count or measure (21 CFR 1304.11(e)).

How long do I have to keep the inventory?

At least two years from the inventory date, available for inspection, under 21 CFR 1304.04. Check your state’s rules too — Florida effectively puts pharmacy records on a four-year clock under s. 465.022(12), F.S.