I usually have too much insulin, probably at least 6 months of supply, of Lantus and even more of Humalog. We even recently gave some away, only to take it back, for fear of illegality and potential harm to the intended recipient, since we didn’t know if they knew enough to use it correctly.
That said, I’ve started to consider what other medication are absolutely necessary, in case there is a shortage. The only one that I consider the loss of as life-threatening would be blood pressure medication. I take a statin, but I can generally get good numbers without it, if necessary, and its loss would not be dangerous. Other items are non-prescription, and only the B-12 , for neuropathy, would I consider important but not likely to be in short supply.
A related article: