This is something for the vet, not for you to experiment with. if the cat is so sick they need antibiotics they need to see a vet. Don't ever inject anything unless you got training by a vet to do so.
It is an IM injection so it goes into the muscle. Have you taken your cat into your Veterinarian to have it checked out first? Do not administer antibiotics without your Vet checking out your cat first. Penicillin is not normally the antibiotic of first choice for a cat.
Cats tolerate penicillin, but the dosage varies from that humans take. Please take this animal to the vet -- even if you do get the right dosage of penicillin, and even if the cat isn't allergic, I presume from your question you're not able to suture the wound. Please get a vet invovled in this.
it is allergic to it you dip wad
The vet
Usually until it is all gone
Fish pen penicillin can be given to a cat being treated for an infection. However, like with all drugs, it should only be given under the advice of a veterinarian.
This varies depending upon the formulation of the penicillin (injectable, topical, oral), the location and type of infection and the overall health status of the cat. If you believe your cat has a condition that needs treatment with penicillin, you should take your cat to your veterinarian.
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My goose is not feeling well and I lost her mate last week. How do I give her pennicilin. It is almost impossible to see her skin. She is a Sebastopol.
You should really know what "bug" is causing the problem as penicillin doesn't not kill a virus. This might be a virus. Best to see and ask the vet.
NO! You must take her to an emergency vet clinic immediately.