They always point to diabetics as among the first to go.
Speaking from personal knowledge. If all of a sudden I was on fixed rations, my need for refrigerated insulin would be eliminated in about three days.
I would imagine that my experience is more the norm.
Of course, if you are a Type 1 diabetic...not so much.
My wife is type one. I have ways of keeping her insulin cold during extended power outages.
getting more when that is gone might be a problem.
Insulin treatment originated with extract from a dead sheep’s pancreas. Without refrigeration, spoils within days.