I find that if I miss certain of my meds, it can be a disaster, but with others I can stand it until it's time for the next dose. What messes me up may not be what messes you up. YMWV.

And I also keep a secondary "reserve" stash on hand in case I can't get to the pharmacy in time. I build it up by renewing prescriptions early. Makes it harder to skip because I ran out.

If I'm REALLY at an extreme, I'll try to scrounge up the biggest dose of what I'm missing from the odds and ends I have left over, but that utterly sucks. It's a pitiful state to be in.