What to ask when the pharmacy has a back order

FDA's drug shortage database listed 69 drugs in current shortage on Nov. 3, 2026, according to GxRadar's shortage tracker, which reads the openFDA shortage feed⁵. Seventy-one percent were injectables, the kind given in hospitals and clinics. By our count, only 12 were tablets, capsules or liquids taken by mouth.

That gap explains a lot of what happens at a retail pharmacy counter. A pharmacist who says a prescription is "on back order" usually means the pharmacy's supplier could not ship it this time. Most such problems never reach FDA's national list. When FDA hears about them, the agency says in its shortage FAQ¹, they "are usually temporary and often involve distribution issues, which resolve when the pharmacy is able to reorder from their distributor."

This guide explains what a back order and a partial fill are, how to look up a drug's national status, and the questions people commonly bring to a pharmacist, prescriber or drug plan. Any decision about a different strength, product or medicine belongs to the prescriber and pharmacist. FDA's own answer on alternatives is that "whether potential alternatives may be appropriate will depend on each patient."

What a back order means at the pharmacy

Retail pharmacies buy most of their stock through wholesale distributors. GxRadar explains the chain in how a pill gets from the factory to the pharmacy and what drug wholesalers do. A back order means the distributor has accepted an order it cannot fill yet. The cause can be local, such as a regional warehouse running low, or it can trace back to a manufacturer.

FDA's view is national. In deciding whether a shortage exists, the agency says¹ it "evaluates the supply and demand (including projected demand) of the drug on a nationwide level." A drug can therefore be hard to find in one town and absent from FDA's list. The reverse also happens. FDA marks a shortage resolved when supply from at least one manufacturer covers total market demand, but the database² notes that "some manufacturers may not have all presentations available." A particular strength or bottle size can stay scarce after the national entry closes.

FDA's list is also broken down further than most people expect. The 69 current entries on Nov. 3 covered 1,189 individual presentations, meaning specific strengths, package sizes and National Drug Codes, in the openFDA records behind GxRadar's tracker.

Partial fills and the balance owed

When a pharmacy has some of a drug but not enough, it may dispense part of the prescription now and owe the rest. For most medicines, state pharmacy law governs how that works, and practice varies.

Federal rules address it directly for Schedule II controlled substances. Under 21 CFR 1306.13⁸, if a pharmacist "is unable to supply the full quantity," the remainder may be filled within 72 hours. If it cannot be, the pharmacist must notify the prescriber, and no more may be supplied without a new prescription. Separately, the Comprehensive Addiction and Recovery Act of 2016⁹ lets a Schedule II prescription be partially filled at the request of the patient or prescriber, where state law allows.

Cost sharing on a short supply is a separate question. Medicare Part D plans must apply a "daily cost-sharing rate" when a network pharmacy dispenses less than a month's supply of a solid oral drug, under 42 CFR 423.153¹⁰. A copay is then multiplied by the days' supply actually dispensed. The rule does not apply to oral antibiotics or to drugs dispensed in their original container. Commercial and Medicaid plans set their own rules, which a plan's member services line can explain.

How to check FDA's shortage list

FDA's Drug Shortages database² is searchable by generic name or active ingredient, with tabs for current and resolved shortages, discontinuations, therapeutic categories and recent updates. The search runs on the generic name, which is printed on a prescription label, rather than on a brand name. Each entry groups presentations by manufacturer, listing every strength and National Drug Code with its availability, any estimated shortage duration, the shortage reason and the date the company last reverified the information. Because the NDC also appears on stock bottles and many pharmacy records, a pharmacist can match the exact product. The FAQ¹ cautions that an "available" status reflects the manufacturer's most current information and "is not an FDA determination that the shortage has been resolved." FDA says its Drug Shortages Staff updates the list daily.

Discontinuations work on a separate clock. Under section 506C of the Federal Food, Drug, and Cosmetic Act, makers of certain important drugs must tell FDA six months before they permanently stop production, or as soon as practicable, the FAQ says. GxRadar looks at the 156 current entries in the "to be discontinued" list. Our companion guide on reading the FDA shortage database walks through each field, and another piece explains why the pharmacists' society ASHP publishes a longer list.

FDA's drug shortages page³ also links to email alerts, downloadable lists and the agency's table of extended use dates⁶, which covers specific lots whose use dates FDA has extended based on manufacturer stability data. Patients and health professionals can report a suspected new shortage through the channels on FDA's reporting page⁴.

Questions people commonly ask

Below are questions people commonly ask, grouped by who can answer them. None of them involves changing how a medicine is taken, which is a conversation for the prescriber.

• For the pharmacist: Is this a back order from the supplier, or is the drug on FDA's shortage list? Is it one strength or package size, or the whole product? When is the next delivery expected, and will the pharmacy call when it arrives?
• For the pharmacist: Can part of the quantity be dispensed now, and how will the remainder be handled and recorded?
• For the pharmacist: Does another store in the chain or another pharmacy nearby have it in stock, and can the prescription be transferred? GxRadar explains prescription transfers, and the pharmacy finder lists licensed pharmacies by ZIP code.
• For the prescriber: Given that the drug is back-ordered, does the prescriber want to review the prescription, and how should the pharmacy reach the office?
• For the drug plan: If the prescriber writes a new prescription, is that product on the formulary, and what does a formulary exception require? How is cost sharing figured on a partial supply?

GxRadar's earlier guide, what to ask when your medicine is in shortage, covers the case where the drug is on FDA's national list.

Which pills and liquids are on the national list now

The oral products on FDA's current list include older generics whose makers have stopped production and controlled substances that carry federal supply limits. The table shows seven of the 12 oral entries on Nov. 3, with the reason FDA recorded.

The stimulant entries have their own supply rules, which GxRadar covers in DEA production quotas and shortages. For the older generics, FDA's 2019 report on root causes⁷ found that manufacturers of older generic drugs "face intense price competition, uncertain revenue streams, and high investment requirements," which limits their incentive to keep making them. Current shortages tend to last. The median entry on FDA's list on Nov. 3 had been there 1,710 days, about four years and eight months, a pattern GxRadar tracks in how long drug shortages last.