# Storage and Stability of Compounded Tirzepatide

Canonical source: https://retacompare.com/research/storage-stability-compounded-tirzepatide-20

Compounded Peptides · 2026-03-06


    Compounded tirzepatide stability varies by formulation but is generally shorter than the ~36 months assigned to branded Mounjaro in its commercial packaging. Typical beyond-use dates for compounded sterile preparations under USP <797> are 14–45 days refrigerated, depending on risk level and whether sterility testing was performed. Some 503B outsourcing facilities can assign longer stability dating supported by product-specific testing. Patients storing compounded tirzepatide should refrigerate it at 2–8°C, protect it from light, and avoid freezing. Storage errors — including accidental freezing during shipping and leaving vials at room temperature — have contributed to potency loss reports throughout 2025 and 2026.


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