How long can a Zepbound single-dose pen or single-dose vial stay out of the fridge?

May be stored unrefrigerated at up to 30 °C (86 °F) for a total of up to 21 days. Clock starts at the first day kept unrefrigerated. Source: FDA prescribing information on DailyMed.

How long can a Zepbound KwikPen or multi-dose vial stay out of the fridge?

Discard 30 days after first use, after 30 days at room temperature, or after 4 weekly doses, whichever comes first. Clock starts at the first use. Source: FDA prescribing information on DailyMed.

How is the discard-by date calculated?

Start date plus N calendar days. For example, Oct 19, 2026 plus 28 days is Nov 16, 2026. The tool also shows days left from today.

Can a product be put back in the refrigerator?

Follow the carton and the Instructions for Use for your presentation. Where the label allows a total number of unrefrigerated days, days out of the refrigerator count toward that total even if the product goes back in.

Is tirzepatide FDA approved?

Yes. FDA approved as Mounjaro (type 2 diabetes) and Zepbound (weight management, obstructive sleep apnea). Numbers on this page quote the FDA prescribing information; your prescriber sets your dose.

Tirzepatide Storage & Discard-By Date Calculator

Short answer

Discard-by date = start date + N days, where N comes only from the FDA label for your presentation. Example: the label limits a Zepbound single-dose pen or single-dose vial to 21 days unrefrigerated, so a clock starting Oct 19, 2026 ends Nov 9, 2026. Label facts as of Oct 19, 2026; check your carton insert.

Discard by: Nov 9, 2026
Days left from today: 21 (from Oct 19, 2026)

Label: May be stored unrefrigerated at up to 30 °C (86 °F) for a total of up to 21 days.
DailyMed, label revised Aug 28, 2026

Math, parameters and sources: model card.

Label in-use periods

Tirzepatide: in-use and unrefrigerated periods quoted from the FDA labels
Product	Days	Label wording (paraphrased)
Zepbound single-dose pen or single-dose vial	21	May be stored unrefrigerated at up to 30 °C (86 °F) for a total of up to 21 days. (DailyMed, Aug 28, 2026)
Zepbound KwikPen or multi-dose vial (in use)	30	Discard 30 days after first use, after 30 days at room temperature, or after 4 weekly doses, whichever comes first. (DailyMed, Aug 28, 2026)
Mounjaro single-dose pen or single-dose vial	21	May be stored unrefrigerated at up to 30 °C (86 °F) for a total of up to 21 days. (DailyMed, Aug 27, 2026)
Mounjaro KwikPen or multi-dose vial (in use)	30	Discard 30 days after first use, after 30 days at room temperature, or after 4 weekly doses, whichever comes first. (DailyMed, Aug 27, 2026)

All labels also say not to freeze the product and to protect it from light and heat. When in doubt, the carton insert for your exact presentation is the authority.

Frequently asked questions

How long can a Zepbound single-dose pen or single-dose vial stay out of the fridge?: May be stored unrefrigerated at up to 30 °C (86 °F) for a total of up to 21 days. Clock starts at the first day kept unrefrigerated. Source: FDA prescribing information on DailyMed.
How long can a Zepbound KwikPen or multi-dose vial stay out of the fridge?: Discard 30 days after first use, after 30 days at room temperature, or after 4 weekly doses, whichever comes first. Clock starts at the first use. Source: FDA prescribing information on DailyMed.
How is the discard-by date calculated?: Start date plus N calendar days. For example, Oct 19, 2026 plus 28 days is Nov 16, 2026. The tool also shows days left from today.
Can a product be put back in the refrigerator?: Follow the carton and the Instructions for Use for your presentation. Where the label allows a total number of unrefrigerated days, days out of the refrigerator count toward that total even if the product goes back in.
Is tirzepatide FDA approved?: Yes. FDA approved as Mounjaro (type 2 diabetes) and Zepbound (weight management, obstructive sleep apnea). Numbers on this page quote the FDA prescribing information; your prescriber sets your dose.

Sources

ZEPBOUND (tirzepatide) injection, for subcutaneous use - Full Prescribing Information, Medication Guide and Instructions for Use (DailyMed SPL set ID 487cd7e7-434c-4925-99fa-aa80b1cc776b, version 40). U.S. National Library of Medicine (DailyMed) / Eli Lilly and Company, Aug 28, 2026. Accessed Oct 19, 2026.
MOUNJARO (tirzepatide) injection, for subcutaneous use - Full Prescribing Information, Medication Guide and Instructions for Use (DailyMed SPL set ID d2d7da5d-ad07-4228-955f-cf7e355c8cc0, version 40). U.S. National Library of Medicine (DailyMed) / Eli Lilly and Company, Aug 27, 2026. Accessed Oct 19, 2026.

Printed from GLP Ladder. To recreate this result, open https://glpladder.com/tools/tirzepatide-storage/

Questions for my clinician