Why Temperature Control Matters for GLP-1 Medications

GLP-1 and related injectable medications are formulated to remain stable within specific temperature limits. When stored correctly, the medication can maintain its expected quality and effectiveness through the manufacturer’s approved storage period. Exposure to excessive heat, direct sunlight, or freezing temperatures may compromise the medicine’s stability—even when the pen or solution appears normal. Maintaining the correct temperature is therefore an important part of protecting every dose at home and while traveling.

Most unopened GLP-1 medications should be refrigerated between 2°C and 8°C (36°F and 46°F). Many products may also be kept at controlled room temperature for a limited period, but the maximum temperature and permitted number of days vary by medication and device type. A medication should never be placed directly against ice, frozen gel packs, freezer walls, or refrigerator cooling elements. When traveling, use a temperature-controlled case that protects the medicine from both overheating and accidental freezing, and always follow the prescribing information included with your specific product.

Find temperature and storage requirements for your medication.

Ozempic® Temperature Requirements

Before first use, Ozempic pens should be stored in a refrigerator between 2°C and 8°C (36°F and 46°F). Keep the medication in its original carton until needed, and do not place it in the freezer or directly beside the refrigerator’s cooling element. Ozempic must not be frozen, and Novo Nordisk instructs patients not to use it if it has been frozen. Excessive heat and sunlight should also be avoided. Exposure outside the approved range may compromise the medicine’s stability, meaning its expected quality and effectiveness can no longer be assured.

After an Ozempic multi-dose pen has been used for the first time, it may be stored for up to 56 days either in the refrigerator at 2°C to 8°C (36°F to 46°F) or at controlled room temperature between 15°C and 30°C (59°F and 86°F). Keep the cap on, remove the needle after every injection, and store the pen without a needle attached. The pen should be discarded after 56 days, even when medication remains. Novo Nordisk also offers single-dose prefilled syringes in the United States; these should remain refrigerated when possible but may be stored between 8°C and 30°C (46°F and 86°F)for up to 28 days before use.

Manufacturer source: Novo Nordisk,Ozempic

Mounjaro® Temperature Requirements

Unopened Mounjaro single-dose pens and single-dose vials should be refrigerated between 2°C and 8°C (36°F and 46°F). When refrigeration is unavailable, an individual single-dose pen or vial may be stored at temperatures no higher than 30°C (86°F) for a total of up to 21 days. Mounjaro should remain in its original carton to protect it from light. It must not be frozen or used after freezing, and it should be protected from excessive heat. Because heat and freezing can affect the stability of injectable proteins, medication that has exceeded the manufacturer’s limits should not be assumed to remain safe or fully effective.

Single-dose Mounjaro devices are used once and discarded, so there is no in-use storage period after they are opened. For Mounjaro multi-dose vials and four-dose KwikPens, unopened devices may remain refrigerated until the labeled expiration date or may be kept at room temperature up to 30°C (86°F) for 30 days. After the vial or KwikPen is first used, it may be stored either refrigerated at 2°C to 8°C or at room temperature up to 30°C. It must be discarded 30 days after first use, after a total of 30 days at room temperature, or after four weekly doses—whichever applies—even when medication remains.

Manufacturer source: Eli Lilly and Company,Mounjaro

Wegovy® Temperature Requirements

Unopened Wegovy single-dose injection pens and prefilled syringes should normally be refrigerated between 2°C and 8°C (36°F and 46°F). Before the cap is removed, a device may be kept between 8°C and 30°C (46°F and 86°F) for up to 28 days when refrigeration is unavailable. Keep it in the original carton to protect it from light. Wegovy must not be frozen or stored directly beside a refrigerator cooling element, and the manufacturer directs patients to discard a device that has frozen, exceeded 30°C or 86°F, been exposed to light, or remained outside refrigeration beyond the approved period.

In the United States, standard Wegovy injection pens and syringes are single-dose devices: once opened and administered, they should be discarded rather than stored for another injection. Wegovy FlexTouch multi-dose pens, where supplied, have different instructions. Before first use, they should be refrigerated at 2°C to 8°C. After first use, a FlexTouch pen may be kept for up to 56 days either refrigerated or between 15°C and 30°C (59°F and 86°F). Keep the cap on, remove the needle after every injection, and protect the pen from excessive heat and light.

Manufacturer source: Novo Nordisk,Wegovy

Zepbound® Temperature Requirements

Unopened Zepbound single-dose pens and single-dose vials should be refrigerated between 2°C and 8°C (36°F and 46°F). If refrigeration is temporarily unavailable, each device may be stored at temperatures no higher than 30°C (86°F)for a total of up to 21 days. Zepbound should remain in its original carton to protect it from light and should be kept away from excessive heat. It must never be frozen, and Lilly advises that frozen Zepbound should not be used. Medication exposed to temperatures beyond these limits should be discarded because its stability and expected performance may no longer be assured.

Single-dose Zepbound pens and vials should be discarded after use and are not intended to be stored after opening. For multi-dose vials and four-dose Zepbound KwikPens, unopened devices may remain refrigerated until the labeled expiration date or may be kept at room temperature up to 30°C (86°F) for 30 days. After first use, they may be stored either in the refrigerator at 2°C to 8°C or at room temperature up to 30°C. The device should be discarded 30 days after first use, after a total of 30 days at room temperature, or after four weekly doses, even if medicine remains.

Manufacturer source: Eli Lilly and Company,Zepbound

Insulin Pen Temperature Requirements

Storage requirements for insulin pens vary by insulin formulation and brand, so there is no single room-temperature time limit that applies to every pen. As a general rule, most unopened insulin pens should be refrigerated between 2°C and 8°C (36°F and 46°F) and may be used until the printed expiration date when continuously stored under the manufacturer’s approved conditions. Insulin should never be frozen or placed directly against ice or frozen cooling packs. Excessive heat and prolonged light exposure should also be avoided. Freezing can permanently damage insulin, while excessive heat may reduce its potency and lead to less predictable glucose control—even when the liquid does not show an obvious change.

After first use, many insulin pens are stored at room temperature rather than returned to the refrigerator, but the permitted period differs substantially by product. For example, Novo Nordisk instructs users to keep an in-use NovoLog FlexPen below 30°C (86°F) and discard it after 28 days, even if insulin remains. By comparison, an in-use Tresiba FlexTouch pen may be kept refrigerated or at room temperature up to 30°C for as long as 56 days. Always store an insulin pen with its cap on and without a needle attached, and check the instructions for the exact brand and formulation before travel. If a pen has frozen, overheated, changed appearance, or been outside its approved range for an unknown period, contact the manufacturer or a pharmacist before using it.

Manufacturer sources: American Diabetes Association, Novolog

Important Safety Note

Temperature limits and permitted storage periods may vary by country, medication strength, packaging format, and device type. “Opened” generally means the first use of a multi-dose pen or vial; a single-dose pen is used once and then discarded. Never rely solely on the appearance of a medication to determine whether a temperature excursion has damaged it. Consult the current package insert, pharmacist, prescribing clinician, or manufacturer whenever the duration or severity of an excursion is uncertain.