I always have a small stockpile of antibiotics, I take them prophylactically sometimes daily, sometimes not, and I have enough to treat an infection should it occur.
I also store thrush tablet treatments, as I am allergic to the pessary/cream, and I get thrush a lot because of the antibiotics, which can in turn cause me to get a UTI. Sometimes it takes several of the "one a day" tablets to treat it, and since I am always getting it, keeping some treatments at home prevent unneeded trips to the medical centre.
With my mental health medication, I have to have a month in advance, simply because if I miss any, I end up in crisis. I need to have enough to tide me over if I miss collecting my meds for any reason.
I also get larger amounts of paracetamol/ibuprofen as I am managing chronic pain and the paracetamol makes my tramadol more effective. I think the OTC packs only have about a days worth of medication in them, so it's a lot more convenient to have the prescription and get a month worth all in one go.
Managing day to day life as a disabled person, it's all about making things a little easier so you can manage to fit it all in. A few less trips to the shop for medication makes a big difference. And the peace of mind when you know if you aren't quite up to going out to the pharmacy, but you have four weeks in hand of meds, so it's not urgent and you can wait until you are well enough is something I don't think I could cope without.