Medicine use by dates...

[diamond lil]

Honey lasts practically forever.

[Peter]

Honey lasts practically forever.

Yes and you can also pack wounds with sugar.

[diamond lil]

Yep, great stuff sugar

[Mad Scientist]

Slightly mouldy bread has been used as a wound pack for thousands of years because of the penicillium mod that grows on it. I’d use it in a post SHTF but any mould that isn’t grey/green, utterly do not use.
Far better to use standard first aid stuff, become trained in herbal medicine. Ointments/balms /cider vinegar live in the fridge/ cool pantry for years. Tinctures can be made with vodka which keeps for ages. Same with infused honeys. Beeswax and olive oil can be made into balms etc. The primary ingredients all have a really long shelf life but the end products could only last a few weeks.