Airline travel with a temperature-sensitive injectable — what changed since

Assessing an excursion: if a package sat at room temperature for a time, visual inspection (cloudiness, discoloration, particles) can alert you to problems. Not visible does not mean not damaged, but visible problems are a reason to contact the supplier.

Reconstituted solutions: once reconstituted, solutions are less stable than lyophilised powder. Refrigerate prepared solutions immediately after preparation. Most stability claims assume refrigeration.

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

Coming back to post #38, because the follow-up matters more than the original answer.

Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is standard refrigerator temperature. Check your refrigerator's actual temperature; some are warmer than the label.

On post #43 — agreed on the reasoning, with one qualification.

Freeze-thaw: some peptides tolerate freezing; others do not. Check your compound's labelling. Generally, repeated freeze-thaw is worse than single freeze-thaw.

Worth separating two things that post #52 runs together.

Assessing an excursion: if a package sat at room temperature for a time, visual inspection (cloudiness, discoloration, particles) can alert you to problems. Not visible does not mean not damaged, but visible problems are a reason to contact the supplier.

Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is standard refrigerator temperature. Check your refrigerator's actual temperature; some are warmer than the label.

Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day at room temperature is usually acceptable. Days to weeks at room temperature risks degradation.

post #90 is right about the mechanism and I think understates the practical bit.

Light protection: avoid direct sunlight and UV exposure. Amber vials or opaque containers reduce light exposure. For short-term storage, keeping the vial in its original packaging (often opaque) usually suffices.