The first aid box contains plasters, lint and crepe bandages, plus those natty synthetic rubber ones that stick to themselves and not to the cats' fur.
Disinfectant, mild enough for all age groups and domestic pets as well as humans. Safety pins, cotton wool, an empty plastic syringe without a needle, for giving cats fluid medicines.
Antihistime (for me) aspirin and some non-prescription tablets that stops runny tummies pronto.
All kept out of force of old habit from when there were small children on a high shelf, behind a door that can be, and is, locked if we have child visitors.