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 opened 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 branded pens that come with a pre-printed expiration date from the manufacturer, compounded GLP-1 vials get their expiration date from your compounding pharmacy. That date is printed directly on the vial label when your medication is prepared.
Here’s what that date means: your pharmacy has determined, based on stability testing and pharmaceutical standards (specifically USP 797[1] for sterile compounded preparations), how long the medication will remain safe and effective when stored properly. Most compounded GLP-1 vials are assigned an expiration window of 90 to 180 days from the date of compounding.
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 expiration date. The moment the expiration 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 opened.
Unopened Vials
An unopened vial should be stored in the refrigerator at all times (36-46°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 open a vial and begin drawing doses, the rules change. Most compounding pharmacies recommend using an opened vial within 28 to 30 days. This recommendation mirrors the guidance for multi-dose vials in clinical settings. After 28 days of opening, the medication should not be used, even if the original expiration date has not passed.
This is important: if you opened a vial on March 1st and the label says it expires on June 1st, you still need to discard it after April 1st (30 days from opening). The opened-vial timeline takes precedence.
Write the opening date on your vial when you first use it so you know when the 30-day window closes. Many patients put a small piece of tape with the date on the vial itself.
Always check the label on your specific vial. Some pharmacies may have different guidelines based on their formulation or local regulations. If your vial says something different, 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:
- 2-4 hours at room temperature (up to 77°F): Usually safe, depending on the specific formulation and manufacturer guidance. Most compounding pharmacies will note this on the vial label or in the instructions they provide. When in doubt, call your pharmacy.
- More than 4 hours at room temperature: The safety and efficacy may be compromised. Do not use it. Contact your pharmacy or ask your provider what to do. They may recommend discarding it or may have specific guidance for your formulation.
- Freezing: Never freeze compounded GLP-1 medications. Freezing damages the protein structure and renders 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.
Visual or sensory 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.
- Unusual odor: Open the vial and smell it. Compounded semaglutide and tirzepatide should have no odor or a very faint odor. If there is a strong or unusual smell, the medication may have been contaminated. Do not inject it.
- Crystal formation: If you see crystals forming inside the vial, the medication is degraded.
When in doubt, contact your pharmacy. They can look at the vial, ask you questions about how it was stored, 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 expiration date passes.
Proper Disposal
The FDA has clear guidance on how to dispose of injectable medications[2]:
If your pharmacy offers a drug take-back program: This is the preferred option. Most local pharmacies (your neighborhood pharmacy or the pharmacy where you fill other prescriptions) will accept unused or expired medications for safe disposal at no cost. Simply bring the vial in its original container and ask for the take-back program.
If no take-back program is available:
- Do not flush the medication down the toilet or drain (unless the label explicitly says it’s safe to do so).
- Mix the medication with an undesirable substance in a sealed container. Coffee grounds or cat litter work well. The goal is to make the medication unpalatable or unrecognizable if the trash is ever accessed.
- Place the sealed container with the mixed medication in your household trash.
- You can also remove the medication from the vial before disposing of it (e.g., by emptying it into the coffee grounds mixture) and place the empty vial in your recycling bin.
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
At Transformation Health, most GLP-1 prescriptions are set up for monthly delivery. This means you should receive a new vial roughly every 30 days, aligned with your injection schedule.
If you are concerned that a vial will expire before you use it (for example, if you are planning a vacation or a dose adjustment), communicate with your care team. Your provider can work with the pharmacy to adjust the timing of your next delivery or to coordinate refills around your travel plans.
Similarly, if you are increasing your dose and will need more medication per month than before, your provider and pharmacy will update your prescription to ensure 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 it expires. Your care team can help you coordinate this.
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 30-day opening window or the original expiration date, do not force yourself to use it.
Contact your provider 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 end of its unopened expiration date.
There is no penalty for requesting a refresh if your medication is about to expire. Your care team wants you to have fresh, safe medication.
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 expiration date and the opening date before you leave. If you will be gone for more than two weeks, you may want to request 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°F (2-8°C)
- Room temperature (threshold): Up to 77°F. Most formulations tolerate brief room-temperature exposure (up to a few hours), but always verify with your pharmacy.
- Above 86°F (30°C) or prolonged heat: Risk of degradation. Contact your pharmacy.
- Below 32°F (0°C): Risk of freezing and permanent damage. Do not freeze.
A standard home refrigerator maintains 35-40°F, which is perfect. 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 mass-manufactured with the same stability testing and quality assurance as FDA-approved branded products. Each batch is prepared by a pharmacy, and the expiration date reflects the pharmacy’s assessment of when that specific batch will remain stable under proper storage conditions.
Respecting the expiration date is part of ensuring the medication works as intended and remains safe to use. It is one of the clearest, most direct ways you control the safety and effectiveness of your treatment.
The Bottom Line
- Unopened vials: Refrigerate and use by the expiration date on the label.
- Opened vials: Use within 28-30 days of opening, even if the original expiration date is further away.
- Temperature matters: Keep the vial refrigerated. Brief room-temperature exposure (under 4 hours) is usually safe, but prolonged heat damages the medication.
- Visual inspection: Clear, colorless liquid is normal. Cloudiness, particles, color change, or unusual odor means do not use it.
- Expired medication: Do not inject it. Dispose of it safely using a pharmacy take-back program or the coffee-grounds method.
- When in doubt: Call your pharmacy or provider. They can assess whether your medication is safe to use.
Your Transformation Health program includes direct access to your pharmacy and care team. If you have any questions about your vial’s expiration, storage, or condition, reach out. That is what they are there for.
Citations
[1] United States Pharmacopeia (USP). “USP 797: Pharmaceutical Compounding Sterile Preparations.” USP Standards. 2022. https://www.usp.org/
[2] FDA. “Disposal of Prescription Medications.” FDA Consumer Safety Information. https://www.fda.gov/drugs/disposal-unused-medicines
Important: Compounded medications are not FDA-approved products. They are prepared by US-based, state-licensed compounding pharmacies and have not been independently evaluated by the FDA for safety, efficacy, or quality. All prescriptions require evaluation by an independent, licensed healthcare provider. Not all patients will qualify. Results vary by individual.