Nitroglycerin has a fairly short half life and doesn't love being exposed to air. Aspirin like any drug has a shelf life but not an unusually short one. Masks e

Nitroglycerin has a fairly short half life and doesn't love being exposed to air. Aspirin like any drug has a shelf life but not an unusually short one. Masks etc are going to have an expiration but unless the package is damaged are likely fine. Airways being invasive require closer management. Tetracycline is one of the few drugs that I am aware of that most practitioners will not use past expiration because of reports in the literature that old tetracycline caused kidney damage. There are well defined SOPs in healthcare for when a sealed kit is opened. It is taken out of service, restocked, QCd, and returned to service. There was no mention of O2 administration in this article but the oxygen kit also requires routine checks and maintenance.