I guess I maybe have more input because I've done the taking care of meds for our family for a while.
I keep a stock of dayquil, nyquil, Mucinex, Zertec as well.
My allergy doctor has me use Zertec instead of Benedryl and the doctor office at work usually says to use Mucinex when I go in with cold/flu symptoms.
Rx stuff:
Our son has multiple diagnosis and has been on a lot of medications so while you can't stock like OTC I do however track the rx meds each family member has taken in a spreadsheet. Each new doctor always asks medical history and will often ask if we have tried x or y medicine. So I simply record the meds, rx# and date prescribed and a brief reason so we can quickly answer the doctor answers.

Also the durable stuff.
We have thermometer, blood pressure cuff, one of those finger blood oxygen readers.
It would also be worth while doing a CPR class and have some of those CPR shields.