Can I Give My Cat Pepcid AC?

Yes, with care
Famotidine is commonly referenced for cats at published doses. The published veterinary reference range for famotidine in cats is 0.5-1 mg per kg of body weight, given every 12-24h. Commonly used short-term for GI upset; persistent vomiting needs a vet.
Source: Merck Veterinary Manual
Get the exact range for your cat's weight

Skip it or ask a vet first if

kidney disease (dose adjustment, vet)

The safe habit

Confirm any medication decision with your veterinarian, who knows your cat's health history and other medications. VetDose shows published reference data, not prescriptions.