I have a vet drawer in my house - need to restock today after a failed shot at getting out a bumblefoot.
I have for chickens:
Medicines: Tylan/Duramycin/Terramycin eye/ gentamycin eye/Pcn injectible (in fridge), Denagard, Corid, Sulmet
Wormers: Eprinex,wazine
Other: Electrolyte powder, vet wrap, scalpels, styptic powder, blue kote, neosporin (without pain meds), polyvisol, sevin dust (in barn), vaseline, qtips, syringes + needles, poultry nipples and my 11/32 drill bit to put the nipples in an emergency waterer when needed. Oh, and gloves of course.
Probably more, but can't think of it at the moment. I'm a nurse, so I like having a stocked cabinet ready!
Haven't used 99% of this stuff but good to know it's there.