What a Beyond-Use Date (BUD) Means on Your Compounded Medication
Pick up a compounded prescription and you will see a date on the label that looks like an expiration date but is called something else: a beyond-use date, or BUD. It is usually much closer than the dates on manufactured medicines. This article explains what a beyond-use date is, how it differs from an expiration date, how a pharmacy decides on it, and what to do when the date arrives.
This article is educational and is not medical advice. Follow the directions on your own label and talk with your pharmacist or prescriber about your medication.
The short definition
The United States Pharmacopeia (USP), which writes the quality standards that compounding pharmacies follow, defines a beyond-use date as the date, or the hour and date, after which a compounded preparation must not be used, stored or transported. The clock starts when the preparation is compounded, not when you pick it up or first open it. After that date the medication should not be used, even if some is left.
Compounded medications are made for one patient at a time by a licensed pharmacy. They are not reviewed or approved by the U.S. Food and Drug Administration (FDA), which does not verify the safety, effectiveness or quality of compounded drugs before they are dispensed. The beyond-use date is one of the ways a pharmacy takes responsibility for quality in the absence of that review: a conservative limit on how long the preparation is expected to stay what it was when it left the pharmacy.
Beyond-use date vs. expiration date
Both dates answer the question “until when is this medicine good?”, but they are set in very different ways.
An expiration date belongs to a manufactured drug product. FDA explains that it reflects the time period during which the product is known to remain stable, keeping its strength, quality and purity when stored as the label directs. The manufacturer establishes it through formal stability testing of that product in its package, and for approved drugs FDA reviews the data. Expiration dates are often years out because the product has been tested for that long.
A beyond-use date belongs to a compounded preparation. Because a compounded medication is made in small quantities for a specific person, it has not been through a years-long stability program. Instead, the pharmacist assigns a date using USP’s standards, which set default maximum limits based on the type of preparation, how it was made and how it will be stored. Those defaults are deliberately short, and a longer date is allowed only when reliable stability information exists for that specific formulation.
| Expiration date | Beyond-use date (BUD) | |
|---|---|---|
| Found on | Manufactured drug products | Compounded preparations |
| Set by | The manufacturer, from stability studies; reviewed by FDA for approved drugs | The compounding pharmacist, under USP standards |
| Typical length | Often years | Hours to months, depending on the preparation |
| Counts from | The date of manufacture | The date (and sometimes hour) of compounding |
How a pharmacy decides the date
Two USP chapters govern beyond-use dates: chapter 795 for non-sterile preparations such as capsules, creams, oral liquids and troches, and chapter 797 for sterile preparations such as injections, eye drops and allergy immunotherapy vials. Revised versions of both became official on November 1, 2023.
For non-sterile preparations, the main question is how much water the preparation contains, because water allows microbes to grow and speeds up chemical breakdown. The default limits are:
| Type of non-sterile preparation | Examples | Default maximum BUD |
|---|---|---|
| Water-containing, no preservative | Some oral suspensions, solutions, gels and creams | 14 days, refrigerated |
| Water-containing, with a preservative | Preserved suspensions, solutions, creams, sprays | 35 days, room temperature or refrigerated |
| Oral liquid without water | Oil-based oral liquids | 90 days, room temperature or refrigerated |
| Other preparations without water | Capsules, tablets, powders, troches, suppositories, ointments without water | 180 days, room temperature or refrigerated |
For sterile preparations, USP sorts compounded medications into three categories, based on how controlled the compounding environment is, how the preparation is sterilized, and whether the batch is tested for sterility before release. In broad terms:
- Category 1 preparations are made under the least controlled conditions, for example in a hood outside a cleanroom suite. Their BUD is at most 12 hours at room temperature or 24 hours refrigerated.
- Category 2 preparations are made in a cleanroom with more environmental controls. Depending on how they are made and stored, the default limits range from one day up to 45 days at room temperature, 60 days refrigerated or 90 days frozen; the longest limits apply only to batches that were terminally sterilized and passed sterility testing.
- Category 3 preparations meet additional requirements for personnel, garbing, disinfection, environmental monitoring and stability data, and are sterility tested and, where applicable, endotoxin tested. They may carry BUDs of up to 180 days.
Whatever the category, a beyond-use date can only be as long as the shortest-lived ingredient allows, and a pharmacy may always assign a shorter date than the default. The pharmacist’s job is to pick the most conservative date the standards, the formula and the ingredients support.
Why your BUD may be shorter than you expected
A short beyond-use date does not mean the pharmacy cut corners. It usually means the preparation contains water and no preservative, which caps a non-sterile BUD at 14 days; or it is a sterile preparation that was not terminally sterilized or sterility tested, so the default limit is a matter of days; or no published stability study exists for that exact formula, so the default applies rather than a longer, data-supported date; or one ingredient has a near expiration date, which shortens the whole preparation.
The practical consequence is that compounded prescriptions are often dispensed in smaller quantities and refilled more often than manufactured ones, so that you finish the medication before the date. If you regularly reach the date with medication left over, tell your pharmacist and prescriber; the quantity dispensed can often be adjusted.
Multi-dose vials: the 28-day rule
Some sterile medications, including many injectable compounded preparations and allergy immunotherapy vials, come in a multi-dose vial that is punctured with a needle more than once. For these, a second clock starts at the first puncture. Citing USP chapter 797, the Centers for Disease Control and Prevention advises that an opened multi-dose vial should be dated and discarded within 28 days unless the labeling states another date, and never used past its original expiration or beyond-use date. So two dates matter for a vial: the beyond-use date on the label, and 28 days from the day you first draw from it, whichever comes first. Writing the first-puncture date on the vial removes the guesswork.
Single-dose vials are different: they are meant to be used once, and leftover contents should not be saved.
Storage is part of the date
Every beyond-use date assumes the medication is stored the way the label says. A preparation assigned 35 days “at room temperature or refrigerated” has not been shown to last 35 days in a hot car. FDA makes the same point about manufactured drugs: a medicine not stored according to its labeled conditions may have degraded before its date. Good habits include:
- Check the label for “refrigerate” or “store at room temperature” the day the medication arrives and put it away accordingly. Refrigerated means the main compartment of the refrigerator, not the door and not the freezer, unless the label says to freeze.
- Keep medications away from heat, direct sunlight and humidity; bathrooms and kitchens are usually the worst rooms for this.
- If a shipment arrives warm when it should be cold, or a refrigerated medication was left out for hours, call the pharmacy before using it.
- Look at the medication before each use. A change in color, cloudiness in a solution that should be clear, particles, or an unusual smell are reasons to stop and call, even before the beyond-use date.
When the date arrives
Do not use a compounded medication after its beyond-use date, even if it looks fine. The risks FDA describes for expired medicines apply here too: the preparation may have lost strength, or breakdown products may have formed that you cannot see. Dispose of leftovers safely: many pharmacies and police departments have take-back bins, and FDA publishes instructions for household disposal when no take-back option is available. Needles and syringes go in a sharps container. If you still need the medication, ask your pharmacy about a refill before you run out, since compounded prescriptions are made to order.
How this works at AccuMix
AccuMix Pharmacy is a 503A compounding pharmacy in Elmhurst, Illinois. Every preparation we dispense carries a beyond-use date assigned by our pharmacists under USP chapters 795 and 797, together with storage directions. Our sterile preparations are made in ISO-classified cleanrooms; every sterile batch is tested for sterility and endotoxins, and potency is tested on a regular schedule and whenever the source of an active ingredient changes. If anything on your label is unclear, a pharmacist can walk you through it. You can read more in our article What is a compounding pharmacy? and on our therapy pages, such as allergy immunotherapy.
Frequently asked questions
Is a beyond-use date the same as an expiration date?
No. An expiration date is set by a manufacturer from stability studies of a manufactured product. A beyond-use date is assigned by a compounding pharmacist, using USP standards, to a preparation made for an individual patient. Both tell you the last day the medication should be used.
Can my pharmacy give my medication a longer beyond-use date?
Only within the limits USP sets, and only when there is reliable stability information for that formulation, container and storage condition. A date cannot be extended because a patient would prefer fewer refills; ask instead whether the quantity or refill schedule can change.
Does the beyond-use date start when I open the medication?
No. It counts from the day the preparation was compounded, so it is already running when you receive it. The one extra rule is for multi-dose vials: once punctured, a vial should also be discarded within 28 days unless the labeling states otherwise, if that comes before the beyond-use date.
Sources and review
Last reviewed November 8, 2026. Written by the AccuMix Pharmacy team and reviewed by a licensed pharmacist.
- United States Pharmacopeia, USP Compounding Standards and Beyond-Use Dates (fact sheet on the revised chapters 795 and 797, with the BUD definition and default limit tables).
- United States Pharmacopeia, Revisions to <795> and <797> Compounding Chapters: Official Status (official date November 1, 2023).
- U.S. Food and Drug Administration, Expiration Dates: Questions and Answers (content current as of November 21, 2025).
- U.S. Food and Drug Administration, Compounding and the FDA: Questions and Answers (content current as of September 16, 2025).
- Centers for Disease Control and Prevention, Preventing Unsafe Injection Practices (single-dose and multi-dose vial guidance, reviewed March 26, 2024).
- U.S. Food and Drug Administration, Disposal of Unused Medicines: What You Should Know.
Questions about the date or storage directions on your compounded prescription? Call AccuMix Pharmacy at 866-817-5303, Monday to Friday, 8:30 AM to 5:30 PM Central, or send us a message.
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