cemiplimab · Medicine question

Can cemiplimab cause immune-mediated pneumonitis?

iatroX medicinesPublished 8 November 2026

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Answer

Yes, immune-mediated pneumonitis, including fatal cases, has been observed with cemiplimab, defined as requiring corticosteroids with no clear alternative cause.

Sources for this answer

LIBTAYO 350 mg concentrate for solution for infusion.Regeneron UK Limited · emc · SmPC §4.4 Special warnings and precautions for use · Version 24Document updated 2 February 2026

Sources checked 8 November 2026

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