How Long Is Compounded Semaglutide Good For? Beyond-Use Dates and Storage

Almost nobody asks this question casually. It comes up when a vial has been sitting on a counter for an afternoon, when a refill is late, or when someone opens the fridge and notices a date they do not recognise. The answer starts with the fact that compounded medications are not dated the way mass-manufactured ones are.

Quick Answer

As of September 26, 2026, compounded semaglutide carries a beyond-use date, not a manufacturer expiration date. The pharmacy that prepared it sets that date for that preparation, based on the formulation, the container, and how it is stored, and prints it on the label. It is typically much shorter than the date on a mass-manufactured product. Follow the label, with one federal caution that sits above it: for a vial containing multiple doses of a sterile compounded medication, FDA recommends: "Discard the vial within 28 days after the first use, even if medication remains in the vial," and it adds that this holds even if the compounder's instructions say the medication can be used for longer; the FDA also says not to use any injectable GLP-1 medication that arrives warm or without enough refrigeration. Compounded medications are not FDA-approved as final products.

Beyond-Use Date, Not an Expiration Date

The two terms get used interchangeably in conversation, and they are not the same thing.

An expiration date belongs to a mass-manufactured product. The manufacturer runs a stability programme on that exact formulation in that exact container, watching it over time under controlled conditions, and the date on the box is the conclusion of that work.

A beyond-use date belongs to a preparation compounded for an individual patient. There is no manufacturer stability programme behind a preparation made for one person, so the pharmacy assigns the date under United States Pharmacopeia standards, working from the formulation, the container it is dispensed in, and the storage conditions it is expected to see. The result is deliberately conservative, and for compounded injectables it is far shorter than the years you see on a mass-manufactured product.

That conservatism is a feature. It is the pharmacy declining to guarantee something it has not tested, which is exactly what you would want from anyone preparing a medication for you.

Compounded medications are not FDA-approved as final products and have not been evaluated by the FDA for safety, effectiveness, or quality. The framework they are prepared under is Section 503A, which covers preparation against a prescription for a specific patient.

Where the Date Lives

On the pharmacy label, on the vial or its carton. That label is worth reading properly once, because it carries three things worth knowing before you need them:

• the beyond-use date,
• the storage instructions for that preparation,
• the name and phone number of the pharmacy that prepared it.

If you have never taken a close look at a prescription label, our guide to what each line on the label means walks through it. If the label is missing, damaged, or has separated from the container, that is a reason to call the pharmacy rather than to estimate.

Storage Is What Keeps the Date Meaningful

A beyond-use date assumes the medication was kept the way the label says. Storage and dating are one subject, not two.

Refrigeration. Semaglutide products are generally stored refrigerated, commonly in the range of 36 to 46 degrees Fahrenheit, until they are in use. Your label states the range that applies to your preparation.

Room temperature. Some products allow a limited period at room temperature once in use. That allowance varies by product, and for a compounded preparation it is whatever the pharmacy has set for that preparation. The label, not a general article, is the authority for that allowance, and a longer label period does not set aside FDA's separate recommendation for a multidose vial after first use, quoted in the quick answer above.

Freezing. Product labeling for semaglutide products directs patients not to freeze them and not to use a product that has been frozen. A vial pushed to the back of a fridge, against the cooling plate, is the usual way this happens by accident.

Light and handling. Keep the medication in its original carton when you are not using it, and out of direct sunlight and hot cars. Traveling has its own rules, which we cover in traveling with semaglutide or tirzepatide.

When Something Has Gone Wrong

The instinct is to look at the vial and judge. That instinct is the problem: a preparation stored outside its conditions can look completely normal, and a harmless bubble can look alarming. Appearance is not a test.

What to do instead, in every one of these cases, is the same. Note what happened, then call the pharmacy named on your label and ask. They set the conditions for that preparation and they are the only party holding the information the answer depends on.

None of these is a reason to feel foolish. Refrigerators fail, bags get left in cars, and labels come off. The pharmacies that prepare these medications field these calls routinely.

Why the Dates Differ So Much From a Brand-Name Product

Patients often notice that a compounded preparation carries a much nearer date and read it as a sign of lower quality. It is a sign of a different framework.

A mass-manufactured product is one formulation, made in enormous quantities, in one container, tested for years. Everything about that setup supports a long dated shelf life. A compounded preparation is made for one patient against one prescription, and the dating standards for that work are built to be cautious in the absence of a product-specific stability programme.

Compounded medications are not generic versions of, equivalent to, or interchangeable with any FDA-approved medication, and they are not dated by the same process either.

What To Ask Your Pharmacy

If you want to be ready before anything goes wrong, these four questions cover most of it:

1. What is the beyond-use date on this preparation, what does it assume about storage, and how does it fit with FDA's separate limit after the vial is first used?
2. What temperature range should I keep it in, and is there a room-temperature allowance once I start using it?
3. How long can it be out of the fridge before I need to call you?
4. What should I do if a shipment arrives warm?

The pharmacy that prepared your medication is named on the label. That is who to ask, and asking early is easier than asking with a vial in your hand and a dose due.

Anything about your treatment itself, including whether to continue, pause, or replace a dose, is a decision for the physician who prescribed it.

What the primary sources say

• U.S. Food and Drug Administration, FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss (accessed September 29, 2026): "Discard the vial within 28 days after the first use, even if medication remains in the vial. Do not continue using medication from the vial after 28 days, even if instructions from the compounder say the medication can be used for longer than 28 days."
• Code of Federal Regulations via Legal Information Institute, Cornell Law School, 21 CFR § 211.137 Expiration dating (accessed September 26, 2026): "To assure that a drug product meets applicable standards of identity, strength, quality, and purity at the time of use, it shall bear an expiration date determined by appropriate stability testing"
• California State Board of Pharmacy regulation via Legal Information Institute, Cornell Law School, Cal. Code Regs. Tit. 16, § 1735.2 (accessed September 26, 2026): "Every compounded drug preparation shall be given a beyond use date representing the date or date and time beyond which the compounded drug preparation should not be used, stored, transported or administered, and determined based on the professional judgment of the pharmacist performing or supervising the compounding."
• DailyMed, U.S. National Library of Medicine, WEGOVY (semaglutide) prescribing information, storage (accessed September 26, 2026): "Do not freeze WEGOVY and do not use WEGOVY if it has been frozen."
• U.S. Food and Drug Administration, Compounding and the FDA: Questions and Answers (accessed September 26, 2026): "Compounded drugs are not FDA-approved. This means that FDA does not verify the safety, effectiveness or quality of compounded drugs before they are marketed."

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