Can cats be given flucloxacillin as an antibiotic? aparently is very good for dogs and humans.?

This is becouse my cat fractured its back leg from a 3rd floor fall, there was no big brake just pain and not being able to put pressure on leg, i did a splint for the leg and everything (no pain killers as they are toxic for them), so preety much first aid (and no im not taking it to the vet, the vet gave me an estimate of 拢700 for the treatment).

Any other tips in healing hurt kitties?

Cat is not in pain, just limping.

Would you do this to a child? Of course not. Take the cat to the vet. She's probably in so much pain right now. If you won't take the cat to the vet, then immediately take her to the shelter. She needs to find a more responsible owner.

Stop trying to take shortcuts on your cat's health, that's irresponsible.
YTou are not trained to deal with this, and there are few nasty things that can go wrong, costing you your cat's mobility at the very least, well done.
Stop trying to play vet, just go to him and get it done right.