Published dose range
Published guidance for cats: VET-DIRECTED (prescription only).
Source: Merck Veterinary Manual →Same rules as dogs: infection-specific product and course from your vet. Guessing with leftover human antibiotics delays real treatment.
Skip it or ask a vet first if
penicillin allergy
If you think you overdosed
Call the Pet Poison Helpline: 855-764-7661 or ASPCA Poison Control: 888-426-4435. Both are staffed 24/7 by veterinary toxicologists.