I recently had to switch from Novolog to Humalog due to insurance preferring Humalog. Since then I have noticed that somewhere in the last 12 hours of the pod expiring, my numbers continue to rise. Most of the time, this happens overnight, but I have had a few pods where their last 12 hours are throughout the day and it still happens. Originally I was fixing this by replacing my pod (which did correct the issue), but more recently I have temp basal’d 20% higher and that keeps it more level.
I have tried keeping the vial in the fridge continuously and that did not seem to help. During this time, if I take a correction bolus, it helps my blood-sugar not rise anymore, but it does not lower me back down. Originally I thought maybe I had just grossly miscalculated food I had eaten, but then I started realizing it keeps happening when I hadn’t eaten within 4 hours+ of the numbers going up. I have a dexcom, so that’s how I can keep a close eye on what’s happening.
I have been doing some research on why I haven’t noticed it before with Novolog and am now experiencing it with Humalog. I came across the fact that Novolog is “rated” up to 98.6 degrees, while Humalog says to be stored at 86 degrees or below. It makes sense to me that if Humalog is only good up to 86 degrees, and my body is obviously near 98.6, that it could spoil the insulin. Could that really happen in only 3 days, though? I have also thought about not lying on the pod at nights, but its sometimes hard to remember that.
Has anyone else experienced this sort of thing with their Omnipod combined with Humalog? Does anyone have any other suggestions that could help the insulin stop losing potency? I really don’t want to spend double the money on Novolog, but I will if I have to.