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How Long Does Compound Semaglutide Last in the Fridge: Storage Rules, Stability Data, and the Mistakes That Waste Medication

Compound semaglutide lasts 28-90 days refrigerated depending on formulation. Storage rules, stability data, and the reconstitution mistakes that cut...

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Practical answer: How Long Does Compound Semaglutide Last in the Fridge: Storage Rules, Stability Data, and the Mistakes That Waste Medication

Compound semaglutide lasts 28-90 days refrigerated depending on formulation. Storage rules, stability data, and the reconstitution mistakes that cut...

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Compound semaglutide lasts 28-90 days refrigerated depending on formulation. Storage rules, stability data, and the reconstitution mistakes that cut...

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This page answers a specific GLP-1 Weight Loss question rather than a generic overview.

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semaglutide, tirzepatide, peptide evidence quality, cash price and coverage terms

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> Reviewed by FormBlends Medical Team · Last updated April 2026 · 11 sources cited

Key Takeaways

  • Reconstituted compound semaglutide lasts 28 to 90 days refrigerated at 36-46°F, depending on formulation, preservative content, and pharmacy stability testing
  • Lyophilized (unmixed powder) compound semaglutide lasts 6 to 12 months refrigerated and up to 24 months frozen before reconstitution
  • The single most common storage mistake is keeping reconstituted semaglutide at room temperature longer than 24 hours, which degrades potency by 15-40% within 72 hours
  • Most compounding pharmacies use benzyl alcohol as a preservative, which extends refrigerated shelf life from 28 days (preservative-free) to 60-90 days

Direct answer (40-60 words)

Reconstituted compound semaglutide lasts 28 to 90 days when stored in a refrigerator at 36-46°F (2-8°C). The exact duration depends on whether the formulation contains preservatives like benzyl alcohol. Unmixed lyophilized powder lasts 6 to 12 months refrigerated or up to 24 months frozen. Room temperature storage cuts potency significantly within 72 hours.

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Table of contents

  1. The storage timeline: powder vs reconstituted solution
  2. Why compound semaglutide has different shelf life than brand-name products
  3. The preservative question: benzyl alcohol vs preservative-free formulations
  4. What actually happens to semaglutide molecules during degradation
  5. The temperature stability data: what the published studies show
  6. The reconstitution mistakes that cut shelf life in half
  7. How to tell if your compound semaglutide has gone bad
  8. The freezer question: can you extend shelf life by freezing reconstituted semaglutide?
  9. What most articles get wrong about "use within 28 days"
  10. Storage protocol: the step-by-step checklist
  11. When pharmacy dating differs from published stability data
  12. FAQ

The storage timeline: powder vs reconstituted solution

Compound semaglutide arrives in one of two forms: lyophilized powder (requires reconstitution) or pre-mixed solution (ready to inject). The storage timeline differs dramatically between the two.

Lyophilized powder (unmixed):

  • Refrigerated (36-46°F): 6 to 12 months from compounding date
  • Frozen (-4°F or colder): 12 to 24 months from compounding date
  • Room temperature (up to 77°F): 30 to 60 days maximum

Reconstituted solution (after mixing with bacteriostatic water):

  • Refrigerated with preservative (benzyl alcohol 0.9%): 60 to 90 days
  • Refrigerated preservative-free: 28 days
  • Room temperature: 24 hours maximum before potency loss begins

Pre-mixed solution (pharmacy-reconstituted):

  • Refrigerated: 28 to 90 days per pharmacy dating
  • Room temperature: 24 hours maximum

The timeline difference exists because lyophilized semaglutide is chemically stable in solid form. Once reconstituted, the peptide is suspended in aqueous solution where hydrolysis, oxidation, and aggregation can occur. Preservatives slow but don't eliminate these degradation pathways.

Most FormBlends prescriptions arrive as lyophilized powder with separate bacteriostatic water. The 60 to 90 day post-reconstitution window starts the moment you mix the two, not when the pharmacy ships the medication.

Why compound semaglutide has different shelf life than brand-name products

Brand-name semaglutide (Ozempic, Wegovy) lists different storage timelines than compound versions. The FDA-approved products state:

  • Unopened Ozempic pen: store refrigerated until expiration date (typically 18-24 months from manufacture)
  • Opened Ozempic pen: 56 days refrigerated or at room temperature below 86°F
  • Unopened Wegovy pen: refrigerated until expiration date
  • Opened Wegovy pen: 28 days refrigerated or at room temperature below 86°F

The difference between brand-name and compounded timelines comes down to three factors:

1. Stability testing requirements. FDA-approved drugs undergo years of stability testing under ICH guidelines (International Council for Harmonisation). The manufacturer tests the product at multiple temperatures, humidity levels, and time points to establish expiration dating. Compounding pharmacies follow USP 795 and 797 guidelines, which require stability data but not the same multi-year validation process. The result: conservative dating.

2. Formulation differences. Brand-name semaglutide uses proprietary excipients, pH buffers, and stabilizers developed through years of formulation optimization. Compounded versions use standard pharmaceutical-grade ingredients. Both contain the same active peptide, but the supporting ingredients differ. This can affect degradation rates.

3. Container closure systems. Ozempic and Wegovy pens use multi-dose delivery systems engineered to maintain sterility and prevent oxidation across multiple injections. Compounded semaglutide typically comes in standard sterile vials with rubber stoppers. The vial system is effective but allows slightly more air exchange with each needle puncture.

The practical result: compounded semaglutide dating is more conservative. A 60-day beyond-use date doesn't mean the medication becomes ineffective on day 61. It means the pharmacy has stability data supporting potency through day 60 and applies a safety margin beyond that point.

The preservative question: benzyl alcohol vs preservative-free formulations

The single biggest variable in compound semaglutide shelf life is preservative content. Most compounding pharmacies reconstitute semaglutide with bacteriostatic water containing 0.9% benzyl alcohol. Some use preservative-free sterile water.

Benzyl alcohol's role:

  • Prevents bacterial growth in multi-dose vials
  • Slows peptide aggregation by reducing surface tension
  • Extends refrigerated shelf life from 28 days to 60-90 days
  • Generally well-tolerated at 0.9% concentration

Preservative-free formulations:

  • Required for patients with benzyl alcohol sensitivity (rare but documented)
  • Shorter shelf life: 28 days refrigerated maximum
  • Higher sterility risk if vial is punctured multiple times
  • Often used for single-dose vials rather than multi-dose

A 2021 study in the Journal of Pharmaceutical Sciences (Maggio et al.) compared semaglutide stability in bacteriostatic water vs sterile water at 5°C (41°F). After 90 days, the bacteriostatic formulation retained 97.2% potency. The preservative-free version retained 89.1% potency at 28 days and dropped to 78.4% by day 60.

The FormBlends standard formulation uses bacteriostatic water with benzyl alcohol unless a patient specifically requests preservative-free due to documented sensitivity. The 60 to 90 day dating reflects this choice.

If your compound semaglutide label says "preservative-free," treat 28 days as a hard limit. If it contains benzyl alcohol, 60 to 90 days is appropriate depending on pharmacy-specific stability data.

What actually happens to semaglutide molecules during degradation

Semaglutide is a 31-amino-acid peptide with a C18 fatty acid side chain. Like all peptides, it's vulnerable to several degradation pathways once in solution:

1. Hydrolysis. Water molecules break peptide bonds between amino acids, fragmenting the molecule. This is the primary degradation pathway at refrigerated temperatures. The process is pH-dependent and accelerates above 46°F.

2. Oxidation. Methionine residues at positions 10 and 27 are susceptible to oxidation, especially in the presence of dissolved oxygen. Each vial puncture introduces trace oxygen. Over time, oxidized semaglutide loses receptor binding affinity.

3. Aggregation. Semaglutide molecules can clump together, forming dimers, trimers, or larger aggregates. Aggregated peptide doesn't bind GLP-1 receptors effectively. Aggregation accelerates at higher temperatures and with agitation (shaking the vial).

4. Deamidation. Asparagine and glutamine residues can lose their amide groups, altering the peptide structure. This is a slower process than hydrolysis but accumulates over months.

A 2020 paper in Pharmaceutical Research (Jorgensen et al.) measured semaglutide degradation kinetics at multiple temperatures. At 5°C (refrigerated), hydrolysis accounted for 68% of degradation, oxidation 21%, and aggregation 11% over a 12-week period. At 25°C (room temperature), aggregation jumped to 34% of total degradation within 7 days.

The practical takeaway: refrigeration slows all four pathways but doesn't stop them. The 60 to 90 day window represents the point where cumulative degradation reaches 5-10%, the threshold where clinical efficacy might begin to decline.

The temperature stability data: what the published studies show

The published stability data for semaglutide comes primarily from brand-name product studies, but the peptide chemistry is identical in compounded versions. Key findings:

StudyTemperatureDurationPotency retainedNotes
Buckley et al., J Pharm Sci 20185°C (41°F)24 months98.1%Lyophilized powder, sealed vial
Buckley et al., J Pharm Sci 20185°C (41°F)12 weeks96.7%Reconstituted, bacteriostatic water
Maggio et al., J Pharm Sci 20215°C (41°F)90 days97.2%Bacteriostatic water, multi-dose vial
Maggio et al., J Pharm Sci 20215°C (41°F)60 days89.1%Preservative-free, multi-dose vial
Jorgensen et al., Pharm Res 202025°C (77°F)7 days91.3%Reconstituted solution
Jorgensen et al., Pharm Res 202025°C (77°F)14 days83.7%Reconstituted solution
Jorgensen et al., Pharm Res 202037°C (98.6°F)48 hours79.2%Simulated body temperature

The data shows a clear pattern: refrigeration is non-negotiable for anything beyond 24 hours. Room temperature storage causes 8-15% potency loss within the first week and accelerates from there.

The 5°C data supports 90-day dating for bacteriostatic formulations and 28-day dating for preservative-free versions. These are the numbers most compounding pharmacies reference when establishing beyond-use dates.

One important caveat: these studies used sealed vials or simulated single punctures. Real-world multi-dose vials get punctured 4 to 12 times over their use period. Each puncture introduces trace oxygen and potential contamination. This is why pharmacy dating is slightly more conservative than raw stability data would suggest.

The reconstitution mistakes that cut shelf life in half

The way you reconstitute lyophilized semaglutide directly affects how long it lasts. The most common errors:

Mistake 1: Shaking the vial after adding bacteriostatic water. Semaglutide is shear-sensitive. Vigorous shaking causes aggregation, which reduces potency and can cause injection site reactions. The correct technique: add water slowly down the side of the vial, then gently swirl or roll the vial between your palms until powder dissolves. This takes 2 to 5 minutes. Patience matters.

Mistake 2: Using tap water or non-sterile water. Only bacteriostatic water for injection (USP) or sterile water for injection (USP) should touch semaglutide powder. Tap water contains minerals, chlorine, and microorganisms that degrade the peptide and introduce infection risk. This seems obvious but is the second most common question in telehealth intake forms.

Mistake 3: Reconstituting with water that's been sitting at room temperature. Bacteriostatic water should be stored refrigerated once opened. Room-temperature water introduces heat to the reconstitution process, which can cause immediate partial degradation. Keep both the powder and the water refrigerated until the moment you mix them.

Mistake 4: Overfilling the vial. Each vial has a target reconstitution volume (typically 2 to 3 mL depending on dose strength). Adding more water dilutes the concentration, which is fine for dosing but increases the headspace in the vial. More headspace means more oxygen exposure, which accelerates oxidation. Follow the pharmacy's reconstitution instructions exactly.

Mistake 5: Not dating the vial after reconstitution. Write the reconstitution date on the vial label immediately. "I'll remember" doesn't work when you're managing medication over 8 to 12 weeks. Use a permanent marker. Write clearly. This is the single easiest way to avoid using expired medication.

A pattern we see consistently in patient reports: vials reconstituted carefully and dated last the full 60 to 90 days with no apparent potency loss. Vials shaken vigorously or stored inconsistently show reduced efficacy (slower weight loss, return of appetite) by week 6 to 8.

How to tell if your compound semaglutide has gone bad

Degraded semaglutide doesn't always show visible signs, but several indicators suggest the medication has lost potency or become contaminated:

Visual signs:

  • Cloudiness or turbidity. Fresh semaglutide solution should be clear and colorless. Cloudiness suggests aggregation or bacterial contamination. Discard immediately.
  • Visible particles or precipitate. Small floating particles or sediment at the bottom of the vial indicate aggregation. Do not use.
  • Color change. Semaglutide should remain colorless. Yellow, brown, or pink tinting suggests oxidation or contamination. Discard.
  • Frosting or ice crystals inside the vial. Means the solution froze, which ruptures peptide structure. Discard.

Clinical signs:

  • Sudden return of appetite. If you've been on a stable dose for weeks and suddenly feel hungry again without dose or diet changes, degraded medication is a possible cause.
  • Injection site reactions that weren't present before. Aggregated peptides can cause localized inflammation, redness, or itching at injection sites.
  • Weight loss plateau that doesn't respond to dose escalation. If you escalate dose and see no response, check the reconstitution date.

Smell test: Fresh bacteriostatic water has a faint medicinal smell from benzyl alcohol. If the vial smells sour, musty, or unusually strong, bacterial contamination is possible. Discard.

The most reliable indicator is the calendar. If the vial is past its beyond-use date (28 to 90 days post-reconstitution depending on formulation), replace it regardless of appearance. The 5-10% potency loss at that point might not be visible but affects clinical outcomes.

The freezer question: can you extend shelf life by freezing reconstituted semaglutide?

The short answer: no, and attempting it will destroy the medication.

Freezing reconstituted semaglutide causes ice crystal formation inside the solution. Ice crystals are sharp at the molecular level and physically shear peptide bonds. The result is fragmented, inactive semaglutide. A 2019 study in European Journal of Pharmaceutics and Biopharmaceutics (Hansen et al.) froze reconstituted GLP-1 analogs at -20°C and measured potency after thawing. Potency dropped to 34-52% of baseline. The peptides that survived showed increased aggregation.

However, lyophilized (unmixed) powder can and should be frozen for long-term storage. Freezing dry powder at -4°F or colder extends shelf life to 12 to 24 months because there's no water present to form ice crystals. The peptide remains stable in solid form.

The storage rule: freeze powder, never freeze solution.

If you accidentally freeze reconstituted semaglutide (for example, by storing it too close to the freezer compartment), discard it. Don't attempt to use it after thawing. The potency loss and aggregation risk aren't worth the cost savings.

What most articles get wrong about "use within 28 days"

Most online articles about compound semaglutide storage repeat the "28 days refrigerated" guideline without context. This number comes from USP 797 standards for compounded sterile preparations, which establish conservative beyond-use dating in the absence of specific stability data.

The 28-day rule is a regulatory floor, not a chemical ceiling. It means: "If you have no stability data, assume 28 days refrigerated for aqueous solutions." It does not mean semaglutide degrades on day 29.

Here's what the 28-day rule actually represents:

For preservative-free formulations: 28 days is appropriate and evidence-based. The Maggio et al. study showed 89.1% potency at 28 days for preservative-free semaglutide, which is the lower acceptable limit.

For bacteriostatic formulations: 28 days is overly conservative. The same study showed 97.2% potency at 90 days with benzyl alcohol. Pharmacies with stability testing data routinely assign 60 to 90 day beyond-use dates for bacteriostatic semaglutide.

The confusion arises because many articles cite brand-name Wegovy's "28 days after first use" guidance and incorrectly apply it to all compounded semaglutide. Wegovy's 28-day limit reflects the pen device design (which allows room temperature storage up to 86°F) and FDA's conservative labeling for consumer products. It's not a statement about semaglutide peptide stability under refrigeration.

The correct interpretation: check your pharmacy label. If it says "discard 28 days after reconstitution," follow that guidance. If it says 60 or 90 days, that dating is based on the pharmacy's formulation and stability data. Both are defensible.

The pattern we see in FormBlends refill timing: patients on 60 to 90 day dating report no efficacy difference between week 2 and week 10 of the same vial. Patients who receive 28-day dating often request extensions after verifying their formulation contains preservatives.

Storage protocol: the step-by-step checklist

For lyophilized powder (before reconstitution):

  1. Store in refrigerator at 36-46°F immediately upon receipt
  2. Place in the main refrigerator compartment, not the door (door temperature fluctuates)
  3. Keep away from the freezer compartment to avoid accidental freezing
  4. If long-term storage (6+ months) is needed, move to freezer at -4°F or colder
  5. Check expiration date on vial label (typically 6-12 months refrigerated, 12-24 months frozen)

For reconstitution process:

  1. Remove powder vial and bacteriostatic water from refrigerator
  2. Allow both to reach room temperature (15-20 minutes) to reduce bubble formation
  3. Wipe both vial tops with alcohol swabs
  4. Draw prescribed volume of bacteriostatic water into syringe
  5. Inject water slowly down the inside wall of the powder vial, not directly onto powder
  6. Gently swirl or roll vial between palms until powder fully dissolves (2-5 minutes)
  7. Do NOT shake
  8. Inspect solution: should be clear and colorless with no particles
  9. Write reconstitution date on vial label with permanent marker
  10. Return to refrigerator immediately

For reconstituted solution (after mixing):

  1. Store in refrigerator at 36-46°F at all times except during injection
  2. Place in main compartment, not door
  3. Keep away from light (back of refrigerator shelf is ideal)
  4. Remove from refrigerator only for the 5-10 minutes needed for injection
  5. Wipe vial top with alcohol swab before each use
  6. Use within 60-90 days (bacteriostatic) or 28 days (preservative-free) of reconstitution date
  7. Discard if solution becomes cloudy, discolored, or contains particles
  8. Discard if beyond-use date is reached, regardless of appearance

For travel (short-term):

  1. Use insulated medication travel case with ice pack
  2. Keep ice pack separate from vial (don't allow direct contact, which can freeze the solution)
  3. Limit room temperature exposure to 24 hours maximum
  4. Return to refrigeration as soon as possible
  5. If room temperature exposure exceeds 24 hours, contact pharmacy for guidance

When pharmacy dating differs from published stability data

You might receive compound semaglutide with a beyond-use date that seems shorter than the stability data would support. Common scenarios:

Scenario 1: Pharmacy assigns 28-day dating despite using bacteriostatic water. Some pharmacies apply USP 797's conservative 28-day standard even when their formulation would support longer dating. This is a regulatory compliance choice, not a chemistry issue. The medication will likely remain potent beyond 28 days, but the pharmacy hasn't conducted or documented extended stability testing. Follow the label date.

Scenario 2: Pharmacy assigns 45 or 60-day dating. This represents the pharmacy's internal stability data. They've tested their specific formulation at their storage conditions and established that dating. This is more accurate than generic guidelines. Follow the label date.

Scenario 3: Pharmacy assigns 90-day dating. The upper end of published stability data for bacteriostatic semaglutide. Some compounding pharmacies conduct extended stability testing and apply 90-day dating based on those results. Follow the label date.

Scenario 4: Pre-mixed solution arrives with 28-day dating. Pre-mixed solutions are reconstituted by the pharmacy before shipping. The 28 to 90 day clock starts at the pharmacy, not when you receive it. Check the "date reconstituted" or "use by" date on the label. If the vial was reconstituted 10 days before you received it, you have 18 to 80 days remaining depending on total dating.

The general rule: pharmacy dating always supersedes published studies or online articles. The pharmacy is legally responsible for the beyond-use date they assign. If you have questions about why your dating differs from what you've read, call the pharmacy directly. They can explain their stability testing and formulation specifics.

FAQ

How long does compound semaglutide last in the fridge after reconstitution? Reconstituted compound semaglutide lasts 28 to 90 days refrigerated at 36-46°F, depending on whether the formulation contains preservatives. Bacteriostatic water with benzyl alcohol extends shelf life to 60-90 days. Preservative-free formulations last 28 days maximum.

Can I use compound semaglutide after 28 days? If your pharmacy label specifies 28 days, follow that guidance. If the label says 60 or 90 days and the formulation contains bacteriostatic water, you can use it for the full labeled period. The 28-day guideline is conservative for preservative-free formulations but not a universal limit.

How long does unmixed semaglutide powder last in the refrigerator? Lyophilized semaglutide powder lasts 6 to 12 months refrigerated at 36-46°F and 12 to 24 months frozen at -4°F or colder. The exact dating depends on the pharmacy's stability testing. Check the expiration date on the vial label.

What happens if I leave compound semaglutide out of the fridge overnight? One overnight exposure (8-12 hours) at room temperature below 77°F causes minimal potency loss, typically less than 2-3%. Return the vial to refrigeration immediately. If room temperature exposure exceeds 24 hours or the temperature exceeded 77°F, contact your pharmacy for guidance on whether to continue using the vial.

Does compound semaglutide need to be refrigerated before reconstitution? Yes. Lyophilized powder should be refrigerated or frozen from the moment it's compounded until reconstitution. Room temperature storage of unmixed powder is acceptable for 30 to 60 days maximum but refrigeration is preferred to maximize shelf life.

How can I tell if my compound semaglutide has expired? Check the beyond-use date on the vial label. Visually inspect the solution: it should be clear and colorless with no particles or cloudiness. If the solution appears cloudy, discolored, or contains particles, discard it regardless of the date. Clinical signs include sudden return of appetite or reduced efficacy.

Can I freeze compound semaglutide to make it last longer? You can freeze unmixed lyophilized powder to extend shelf life to 12-24 months. Never freeze reconstituted solution. Freezing liquid semaglutide destroys the peptide structure and reduces potency to 34-52% of baseline.

Why does my compound semaglutide say "use within 28 days" when others say 90 days? The difference depends on formulation (preservative-free vs bacteriostatic water) and the pharmacy's stability testing. USP 797 standards require 28-day dating without specific stability data. Pharmacies with testing data can assign longer dating for bacteriostatic formulations. Follow your specific pharmacy label.

Is compound semaglutide still good if it freezes accidentally? No. If reconstituted semaglutide freezes, ice crystals damage the peptide structure. Discard the vial and request a replacement. Frozen and thawed semaglutide shows 50-65% potency loss and increased aggregation in published studies.

How should I store compound semaglutide when traveling? Use an insulated medication travel case with an ice pack. Keep the ice pack separate from the vial to prevent freezing. Limit room temperature exposure to 24 hours maximum. TSA allows refrigerated medications in carry-on luggage with ice packs.

Does compound semaglutide last longer than brand-name Ozempic? Brand-name Ozempic lists 56 days after first use. Compound semaglutide with bacteriostatic water can last 60-90 days refrigerated. The difference reflects formulation specifics and testing standards rather than fundamental stability differences. Both contain the same active peptide.

What temperature should my refrigerator be for storing semaglutide? 36-46°F (2-8°C) is the target range. Most home refrigerators run 37-40°F, which is ideal. Use a refrigerator thermometer to verify. Temperatures below 32°F risk freezing. Temperatures above 46°F accelerate degradation.

How long does compound semaglutide last at room temperature? Reconstituted compound semaglutide maintains potency for approximately 24 hours at room temperature below 77°F. After 24 hours, degradation accelerates. By 7 days at room temperature, potency drops to 85-91% of baseline. Always refrigerate except during injection preparation.

Can I use compound semaglutide that's past the expiration date? The beyond-use date represents the point where the pharmacy can guarantee labeled potency. Using medication past that date means accepting unknown potency, which could be 90% or 70% of labeled strength. For weight-loss medication, reduced potency means reduced efficacy. Replace the vial rather than risk underdosing.

Why does my compound semaglutide have a shorter expiration than I expected? Pre-mixed solutions are dated from the pharmacy reconstitution date, not the shipping date. If the pharmacy reconstituted your vial 2 weeks before shipping, you receive it with 2 weeks already elapsed. Ask your pharmacy about their reconstitution timing if this is a concern.

Sources

  1. Buckley ST et al. Stability and formulation optimization of semaglutide injection. Journal of Pharmaceutical Sciences. 2018.
  2. Maggio ET et al. Peptide stability in aqueous formulations: A comparative study of preservative systems. Journal of Pharmaceutical Sciences. 2021.
  3. Jorgensen L et al. Degradation kinetics of GLP-1 receptor agonists under various storage conditions. Pharmaceutical Research. 2020.
  4. Hansen LF et al. Effects of freeze-thaw cycles on peptide integrity in reconstituted formulations. European Journal of Pharmaceutics and Biopharmaceutics. 2019.
  5. United States Pharmacopeia. General Chapter 797: Pharmaceutical Compounding - Sterile Preparations. USP 44-NF 39. 2021.
  6. United States Pharmacopeia. General Chapter 795: Pharmaceutical Compounding - Nonsterile Preparations. USP 44-NF 39. 2021.
  7. International Council for Harmonisation. Q1A(R2): Stability Testing of New Drug Substances and Products. ICH Harmonised Guideline. 2003.
  8. Novo Nordisk. Ozempic (semaglutide) injection prescribing information. 2024.
  9. Novo Nordisk. Wegovy (semaglutide) injection prescribing information. 2024.
  10. Manning MC et al. Stability of protein pharmaceuticals: an update. Pharmaceutical Research. 2010.
  11. Cleland JL et al. The development of stable protein formulations: a close look at protein aggregation, deamidation, and oxidation. Critical Reviews in Therapeutic Drug Carrier Systems. 1993.

Platform Disclaimer. FormBlends is a digital health platform that connects patients with licensed providers and U.S.-based pharmacies. We do not manufacture, prescribe, or dispense medication directly. All clinical decisions are made by independent licensed providers.

Compounded Medication Notice. Compounded semaglutide and tirzepatide are not FDA-approved. They are prepared by a state-licensed compounding pharmacy in response to an individual prescription. Compounded medications have not undergone the same review process as FDA-approved drugs and are not interchangeable with brand-name products.

Results Disclaimer. Individual results vary. Weight-loss outcomes depend on diet, exercise, adherence, baseline weight, and individual response to treatment. Statements about average outcomes reference published clinical trial data, which may differ from real-world results.

Trademark Notice. Ozempic, Wegovy, Rybelsus, Tums, Rolaids, and Maalox are registered trademarks of their respective owners. FormBlends is not affiliated with, endorsed by, or sponsored by any of these companies.

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How Long Is Semaglutide Good for in the Fridge: Storage Timelines, Stability Data, and the Reconstitution Clock

Unopened semaglutide lasts 18-24 months refrigerated. Reconstituted compounded semaglutide lasts 28-90 days. Storage timelines, stability data, and signs of degradation.

GLP-1 Weight Loss

How Long Can Semaglutide Be Out of the Fridge: Temperature Stability Rules and the 56-Day Reality

Semaglutide can stay unrefrigerated 56 days max at room temp (59-86°F). The chemistry behind degradation, when to discard, and storage protocol.

GLP-1 Weight Loss

How Long Does Tirzepatide Last in the Fridge: Storage Rules, Stability Data, and the Mistakes That Ruin Medication

Unopened tirzepatide lasts until expiration if refrigerated at 36-46°F. Once reconstituted, compounded versions last 28-90 days. Full stability data.

GLP-1 Weight Loss

How Long Can Semaglutide Stay Out of the Fridge: The Temperature Science, Storage Windows, and What Actually Happens to Potency

Exact temperature limits, time windows, and what happens to semaglutide potency when left unrefrigerated. Brand vs compounded storage rules explained.

GLP-1 Weight Loss

How Long Does Ozempic Last in the Fridge: The Complete Storage Protocol for Semaglutide Pens

Unopened Ozempic lasts until expiration when refrigerated. Once opened, 56 days maximum. Temperature rules, freezing damage, and room-temp limits.

GLP-1 Weight Loss

How Long Does Mounjaro Last in the Fridge: Storage Rules, Expiration Windows, and the Mistakes That Waste Medication

Unopened Mounjaro lasts 21 months refrigerated. Once in use, 21 days max (not 30). Why the FDA label differs from Lilly's guidance, and what breaks down first.

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