When a medication is on backorder, it means the manufacturer cannot produce or ship enough of that drug to meet current demand. Your pharmacy hasn’t stopped carrying it, and it hasn’t been pulled from the market. The supply chain has simply hit a bottleneck, and pharmacies are waiting for new stock to arrive. As of the most recent data, there are 216 active drug shortages tracked in the United States, so this is far from rare.
A backorder can last anywhere from a few days to many months, and the timeline is often unpredictable. What matters to you is understanding why it’s happening, how long you might wait, and what your real options are for getting the medication you need.
Why Medications End Up on Backorder
Drug shortages generally come down to three problems: a sudden spike in demand, a drop in manufacturing capacity, or a breakdown in coordination between the companies that make, distribute, and deliver medications.
The single biggest driver under normal conditions is manufacturing quality failures. An FDA analysis found that quality problems were responsible for 62 percent of drugs that went into shortage between 2013 and 2017. That could mean a factory failed an inspection, a batch was contaminated, or equipment broke down. When that happens, production stops until the problem is fixed, and existing inventory drains quickly. Manufacturers often can’t ramp up production fast enough to close the gap, especially when the supply chain for raw ingredients is already stretched thin.
Demand surges are the other major factor. A pandemic, a natural disaster, or even a viral social media post about a medication can push orders far above normal levels. During COVID-19, global demand spiked for dozens of drugs while lockdowns simultaneously reduced factory output. That kind of double hit, more people wanting a drug while less of it is being made, creates shortages that can take months to resolve.
Sometimes the supply technically exists but can’t reach the right places. Geopolitical disruptions, shipping delays, or communication breakdowns between wholesalers and pharmacies can leave some regions well-stocked while others have empty shelves. Your pharmacist may be told the drug is “available” at the manufacturer level while their wholesaler has none to send.
How Pharmacies Learn About Backorders
Pharmacies order most of their stock through large wholesalers, not directly from manufacturers. When a wholesaler’s supply runs low, they place limits on how much any single pharmacy can order. This is called allocation. Your pharmacy might be able to get a partial shipment instead of their full order, or they might be cut off entirely until the next batch arrives.
Manufacturers sometimes share an estimated release date for when new stock will be available. But these dates are notoriously unreliable. A study of hospital pharmacy operations found that estimated release dates were pushed back to a later date 71 percent of the time. On average, each delay shifted the expected arrival by about two and a half weeks. The accuracy of these estimates didn’t improve even as manufacturers updated them, meaning a revised date was no more trustworthy than the original one. For pharmacists and patients alike, “expected back in stock next week” often turns into next month.
Two organizations track shortages publicly. The FDA lists drugs when manufacturers report they cannot meet current market demand. The American Society of Health-System Pharmacists maintains its own list, adding drugs when the shortage is verified with manufacturers and affects how pharmacies prepare, dispense, or substitute medications. Both databases are searchable online and updated regularly.
What This Means for Your Prescription
If your pharmacist tells you a medication is on backorder, it doesn’t mean your prescription is canceled or invalid. It means they physically don’t have the drug to fill it right now. Your prescription stays active, and the pharmacy will typically fill it as soon as stock arrives. But waiting isn’t always an option, especially for medications you take daily.
The practical impact depends on the drug. For a one-time antibiotic, a delay of even a few days could be a real problem. For a maintenance medication like a blood pressure pill, you may have enough of a supply at home to wait it out. The trouble comes when backorders stretch on with no reliable end date, and you’re counting your remaining pills.
Fifteen percent of current active drug shortages involve controlled substances, which face additional regulatory hurdles. These medications have production quotas set by the DEA, meaning manufacturers can only produce a certain amount each year. Even when demand rises, production can’t always increase to match.
Steps You Can Take Right Now
Start by contacting your pharmacy a few days before your refill is due, every time. This gives you a buffer to find alternatives if your medication isn’t available. If you wait until the day you run out, your options shrink dramatically.
If your pharmacy doesn’t have the drug in stock, ask them to check other locations in their chain. Pharmacies within the same company can see each other’s inventory, and a location across town may have what you need. Keep in mind that they typically can’t check pharmacies outside their chain, so if that search comes up empty, you’ll want to call independent pharmacies or other chains yourself.
Ask your pharmacist whether a therapeutic alternative exists. Sometimes a different manufacturer makes the same drug, or a closely related medication in the same class could work for you. Your pharmacist can identify candidates, but your prescriber will need to approve or write a new prescription for the substitute.
If you need to switch from a generic to a brand-name version (or vice versa), check your insurance formulary first. The substitute may sit on a different cost-sharing tier, meaning you’d pay more out of pocket. You may need a prior authorization or an override from your insurer to get it covered at a reasonable price. Once you know what’s required, contact your prescriber to make them aware of the shortage and get the paperwork started.
Getting Insurance to Cover an Alternative
When a backorder forces you onto a more expensive medication, you’re not necessarily stuck paying the higher price. If you have Medicare Part D, you can file a tiering exception to get a non-preferred drug at the lower cost-sharing level normally reserved for your usual medication. You can also file a formulary exception to get coverage for a drug that isn’t on your plan’s approved list at all.
Both types of requests require a supporting statement from your prescriber explaining why the alternative is medically necessary. Your doctor can submit this verbally or in writing. The statement needs to explain that the drugs normally covered by your plan won’t work as well for your condition or would cause adverse effects. Private insurers have similar exception processes, though the specific steps vary by plan.
Compounded Versions During Shortages
When a drug appears on the FDA’s official shortage list, special rules kick in for compounding pharmacies. Normally, pharmacies aren’t allowed to make copies of commercially available FDA-approved drugs. But when a drug is listed as being in shortage, that restriction is lifted. A compounding pharmacy can prepare the medication using bulk ingredients, as long as all other legal requirements are met, including having a valid prescription for an individual patient.
Larger compounding facilities called outsourcing facilities can also produce the drug during a shortage, potentially in bigger quantities. This pathway became well-known during the GLP-1 medication shortages, when compounding pharmacies filled gaps left by manufacturers who couldn’t keep up with demand. Not every backordered drug has a compounded alternative available, but it’s worth asking your pharmacist or prescriber whether one exists for yours.
How Long Backorders Typically Last
There’s no standard timeline. Some backorders resolve in a week or two when a new manufacturing batch ships. Others drag on for months or even years when the underlying problem is structural, like a factory shutdown or a raw ingredient that’s difficult to source. The unreliability of manufacturer estimates makes planning difficult. A hospital pharmacy study found that the pattern of delays was essentially random, with no way to predict whether the next update would bring good or bad news.
Your best strategy is to stay proactive rather than waiting for the shortage to resolve on its own. Check in with your pharmacy regularly, keep your prescriber informed, and have a backup plan in place. The earlier you start looking for alternatives, the less likely you are to miss doses.