Yes, I do keep a first aid box but these days it is a quite small container, with reserve monthly stock of medicines I need and others for DGC emergencies.
However, when my DC were small, medicines took up a large space. This was because after a visit to the doctor’s , I took the prescription to the pharmacy, where we were given medicine sold in packets from the manufacturer, not split up and counted out like in the UK. So if you had to take one tablet for ten days and the packet had twelve you kept the two odd ones left incase it could be used with another prescription within the date limit.
There was a time, many years ago that pharmacies excepted in-date medicine, to be redistributed 3rd world countries but it was found certain people in the trade were reselling them. At that time, about twenty years ago you paid for the medicine but got refunded through your bank.
These days, we don’t pay for the majority of medicines in France, if the doctor has prescribed them, but you have to show your medical identity card. Sadly there are still leftover half packets.