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Medicines cemiplimabQuestion & answer

cemiplimab · Medicine question

What is the shelf life of an unopened vial of Libtayo (cemiplimab)?

iatroX medicinesPublished 8 November 2026

The answer

Answer

An unopened vial of Libtayo (cemiplimab) has a shelf life of 4 years.

Sources for this answer

LIBTAYO 350 mg concentrate for solution for infusion.Regeneron UK Limited · emc · SmPC §6.3 Shelf life · Version 25Document updated 5 November 2026

Sources checked 8 November 2026

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cemiplimab

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How much L-proline and polysorbate 80 does each 7 ml vial of Libtayo (cemiplimab) contain?How should unopened vials of Libtayo (cemiplimab) be stored?How is cemiplimab (Libtayo) administered, and how long does each infusion take?How many vials are in a carton of Libtayo (cemiplimab), and what volume does each contain?How should diluted Libtayo (cemiplimab) be mixed during preparation?What does Libtayo (cemiplimab) concentrate for solution for infusion look like?

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