Semaglutide Expiration: How Long GLP-1 Vials Last
The Question You’re Asking
You have a vial of compounded GLP-1 medication in your refrigerator. The date on the label says it expires in a few weeks. Or you’re planning a vacation and wondering whether your medication will still be good when you return. Or you started a vial three weeks ago and you’re not sure if it’s safe to use anymore.
These are the kinds of practical questions that come up when you’re managing medication on your own. The good news is that compounded GLP-1 medications have straightforward expiration rules, and they’re designed to be clear and safe to follow.
How Compounded GLP-1 Expiration Works
Unlike brand-name pens, which come with a manufacturer’s expiration date, compounded GLP-1 vials get their date from the compounding pharmacy that prepared them. That date is printed directly on the vial label when your medication is prepared. Technically it is a beyond-use date (BUD), though most people, and many labels, simply call it the expiration date.
Here’s what that date means: under USP General Chapter 797, the national standard for sterile compounded preparations (the revised chapter has been official since November 1, 2023)[1], the pharmacy assigns a beyond-use date based on how the preparation was made, whether it was sterility tested, the stability data available, and how it is meant to be stored. Because those factors differ, one pharmacy’s vial can carry a very different date than another’s. There is no single standard window for every compounded GLP-1 vial, so the date on your vial’s label is the one that applies to it.
The key phrase is “when stored properly.” If the vial is kept in the refrigerator at the right temperature (36-46 degrees Fahrenheit / 2-8 degrees Celsius), it will be good until that date. The moment the date passes, you should not use the medication.
Storage Rules: Unopened vs. Opened
The rules for compounded GLP-1 are straightforward, but they depend on whether the vial has been started.
Unopened Vials
An unopened vial should be stored in the refrigerator at all times (36-46 degrees F). As long as it stays refrigerated and has not been exposed to freezing temperatures or room-temperature excursions, it is good until the date printed on the label. Do not rely on memory or the shipping date. Always check the label.
If you receive a vial and it was left out of refrigeration during shipping (which does happen), contact your pharmacy before using it. They can advise you on whether the medication is still safe.
Opened Vials or Vials in Use
Once you first puncture the vial’s rubber stopper with a needle and begin drawing doses, a second clock starts. Under USP 797, a multiple-dose compounded vial must not be used for longer than 28 days after it is first entered or punctured, or past its beyond-use date, whichever comes first[3]. This mirrors the 28-day rule for multiple-dose vials in clinical settings.
This is important: if you first used a vial on March 1st and the label date is June 1st, you still need to discard it 28 days later, on March 29th. The in-use timeline takes precedence.
Write the date of first use on your vial so you know when the 28-day window closes. Many people put a small piece of tape with the date on the vial itself.
Always check the label on your specific vial. Some pharmacies assign a shorter in-use period based on their formulation or state rules. If your vial label gives a shorter limit, follow what your pharmacy states.
Temperature Excursions: When Your Medication Got Too Warm
Temperature is critical for peptide-based medications like semaglutide and tirzepatide. These medications are proteins, and heat degrades them.
If your vial has been left out of the refrigerator, here’s what matters:
- Brief time at room temperature: How long a vial can sit out depends on the formulation, and compounded preparations do not share a single standard. Follow the room-temperature limit on your pharmacy’s label or written instructions. If there is none, or you are unsure, call your pharmacy before using it.
- Longer or unknown time out of the refrigerator: The safety and efficacy may be compromised. Do not use it until you have checked with your pharmacy or prescriber. They may recommend discarding it or may have specific guidance for your formulation.
- Freezing: Never freeze compounded GLP-1 medications. Freezing can damage the protein structure and make the medication ineffective. If a vial has been frozen, do not use it.
If you are traveling and your medication was exposed to heat or left out of refrigeration unexpectedly, contact your pharmacy immediately. Tell them exactly how long it was out and at what temperature. They can advise you on whether it is safe to use.
Signs Your Vial Has Degraded
Compounded GLP-1 medications should be clear and colorless. If you look at the vial and anything seems off, trust your instinct and do not use it.
Check by looking through the glass. Do not remove the stopper or open the vial to inspect it, because that breaks its sterility. Visual signs of degradation:
- Particles or cloudiness: The liquid should be completely clear. If you see floating particles, cloudiness, or any turbidity, the medication has likely degraded. Do not inject it.
- Color change: The liquid should be colorless or nearly colorless. If it looks yellow, brown, or any other color, do not use it.
- Crystal formation: If you see crystals forming inside the vial, the medication is degraded.
When in doubt, contact your pharmacy. They can ask you how the vial was stored and what you are seeing, and tell you whether it is safe to use. It is always better to ask than to inject medication you are unsure about.
What to Do When Your Medication Expires
Do not inject expired medication. GLP-1 medications lose potency over time, and using expired medication means you may not get the intended effect (appetite reduction and metabolic support). More importantly, you cannot be sure of the medication’s stability or safety after the date passes.
Proper Disposal
The FDA has clear guidance on how to dispose of unused and expired medicines[2]:
If a drug take-back option is available: This is the FDA’s preferred option. Take-back options include drop-off sites, which some pharmacies, hospitals, and law enforcement locations host, and prepaid mail-back envelopes. Bring the vial in its original container.
If no take-back option is available:
- Do not flush the medication down the toilet or drain unless it is on the FDA’s flush list or the label explicitly says to.
- Mix the medication with an unappealing substance, such as used coffee grounds, dirt, or cat litter. The goal is to make the medication unappealing and unrecognizable if the trash is ever accessed.
- Seal the mixture in a plastic bag or container and place it in your household trash.
- Scratch out your personal information on the prescription label. If you are not sure how to handle a vial that still has liquid in it, ask your pharmacy rather than opening it.
Needles and syringes: Put used needles and syringes in a sharps disposal container right after use. Keep the container away from children and pets, and when it is about three-quarters full, get rid of it according to your community’s rules (options can include drop-off sites, household hazardous waste sites, mail-back programs, and special pick-up)[4].
Do not: Leave medication on the counter, hand it to someone else, or store it indefinitely. Expired medication should be disposed of promptly.
If you have questions about disposal for your specific vial, ask your pharmacy. They can walk you through the process.
Expiration and Your Refill Schedule
Many telehealth programs that prescribe compounded GLP-1 medication ship a new vial on a recurring schedule, such as monthly, timed to your injection schedule. The cadence varies by program and pharmacy, so it helps to know how yours works.
If you are concerned that a vial will reach its date before you use it (for example, if you are planning a vacation or a dose adjustment), ask your prescriber or the pharmacy whether the timing of your next shipment can be adjusted, and how many doses each vial holds at your current dose.
Dose changes are a common source of leftover medication. If your dose is going up or down, ask whether the next fill will match the new dose and what to do with a vial you have already started, so you are not sitting with excess medication that will expire.
The goal is simple: you should always have fresh medication on hand that you will use before its label date and within the 28-day in-use window.
What If You Missed a Dose and the Vial Is Getting Old?
If you have been using the same vial for longer than expected (perhaps because you missed some doses or reduced your frequency), and the vial is approaching either the 28-day in-use limit or the date on its label, do not force yourself to use it.
Contact your prescriber or pharmacy. Explain the situation. They can advise you on whether to continue with that vial or to request a new one. This is especially important if the vial is also approaching the date printed on its label.
Ask whether a replacement vial can be sent early and whether there is a cost for it. Policies on early refills differ between programs and pharmacies, and fresh medication is worth the call.
Traveling With Medication and Expiration
If you are traveling and taking GLP-1 medication with you, plan your refills accordingly. Check your current vial’s label date and the date you first used it before you leave. If you will be gone for more than two weeks, you may want to ask your prescriber or pharmacy about an early refill so you have a fresh vial before you depart.
For detailed guidance on traveling with GLP-1 medication, including TSA rules and temperature management during air travel, see our Traveling With GLP-1 Medication guide.
Storage Temperature Reference
Keep these temperatures in mind:
- Correct refrigeration: 36-46 degrees F (2-8 degrees C)
- Room temperature: How long a vial can stay out of the refrigerator depends on the formulation. Follow your pharmacy’s label or written instructions, and call the pharmacy if you are unsure.
- Heat (a hot car, direct sun, or prolonged warmth): Risk of degradation. Contact your pharmacy.
- Below 32 degrees F (0 degrees C): Risk of freezing and permanent damage. Do not freeze.
Home refrigerators are commonly set at or below 40 degrees F; check that yours stays within 36-46 degrees F. If you have an older refrigerator that may fluctuate, consider using a small refrigerator thermometer to check.
For more on storage best practices, see our GLP-1 Medication Storage Guide.
Why Expiration Dates Matter for Compounded Medications
Compounded medications are not FDA-approved, and the FDA does not review them for safety, effectiveness, or quality the way it reviews brand-name products. Each batch is prepared by a pharmacy, and the beyond-use date reflects the pharmacy’s assessment, under USP 797, of how long that specific batch will remain stable under proper storage conditions.
Respecting the date on the label, and the 28-day limit once a vial is in use, is part of making sure the medication works as intended and remains safe to use. It is one of the simplest ways you can protect the safety and effectiveness of your treatment.
The Bottom Line
- Unopened vials: Refrigerate and use by the date on the label (the beyond-use or expiration date).
- Vials in use: Use within 28 days of first puncture, or by the label date if that comes first.
- Temperature matters: Keep the vial refrigerated. Follow your pharmacy’s label for how long it may be out of the refrigerator; prolonged heat damages the medication.
- Visual inspection: Clear, colorless liquid is normal. Cloudiness, particles, color change, or crystals means do not use it.
- Expired medication: Do not inject it. Dispose of it using a take-back option or the household-trash method the FDA describes, and put used needles in a sharps container.
- When in doubt: Call your pharmacy or prescriber. They can assess whether your medication is safe to use.
If you have any questions about your vial’s date, storage, or condition, call the pharmacy listed on your vial label or contact your prescriber. They have the details of your specific formulation.
Citations
[1] United States Pharmacopeia (USP). “General Chapter 797: Pharmaceutical Compounding - Sterile Preparations.” Revision published November 1, 2022; official November 1, 2023. https://www.usp.org/compounding/general-chapter-797
[2] U.S. Food and Drug Administration. “Disposal of Unused Medicines: What You Should Know.” Content current as of October 31, 2024. https://www.fda.gov/drugs/safe-disposal-medicines/disposal-unused-medicines-what-you-should-know
[3] United States Pharmacopeia (USP). “797 FAQs.” Updated December 11, 2023 (questions 193-194, multiple-dose CSPs). https://pages.usp.org/rs/711-SXF-172/images/USP_HQS_797_FAQs_December2023_V6__002.pdf
[4] U.S. Food and Drug Administration. “Best Way to Get Rid of Used Needles and Other Sharps.” Accessed October 16, 2026. https://www.fda.gov/medical-devices/safely-using-sharps-needles-and-syringes-home-work-and-travel/best-way-get-rid-used-needles-and-other-sharps
Important: This content is for general education and is not medical advice. Talk with a licensed provider about your situation. Transformation Health is an independent publisher. It does not provide medical care, prescribe, or sell medication. Compounded medications are not FDA-approved. The FDA does not review them for safety, effectiveness, or quality, and they are not the same as brand-name products; they may differ in formulation, purity, and potency. Storage and beyond-use instructions differ by pharmacy and formulation. Always follow the label and written instructions from the pharmacy that prepared your medication.