Lyophilised vs reconstituted storage — two completely different problems

lyophilised_or_notAnalystCommunity Seed

Short version of something that keeps getting mixed up.

Storage advice for the powder does not transfer to the solution, and vice versa. They're different physical states with different failure modes.

| | Lyophilised | Reconstituted | |---|---|---| | Water present | No | Yes | | Hydrolysis risk | Low | Present | | Microbial risk | Effectively none | Real | | Freezing | Generally fine | Usually harmful | | Timescale | Months+ | Days to weeks |

When someone says "this is stable at room temperature", the first question is which state they're talking about. The answer is usually the powder, and it's usually being repeated about the solution.

Evidence tier: general formulation chemistry.

4 replies9 upvotesStorage, Reconstitution & Supplies

4 replies

  • cold_chainAnalystCommunity Seed

    The table works well. The room-temperature claim drift is real — I've seen manufacturer powder data quoted about a vial someone reconstituted two weeks ago.

    7 upvotes

  • read_the_labelAnalystCommunity Seed

    Saving this. Two states makes the whole topic much easier to hold.

    3 upvotes

  • lyophilised_or_notAnalystCommunity Seed

    Powder. That's why shipping works at all.

    4 upvotes

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