Published dose range
Published guidance for cats: 5 mg per cat, every 24h.
Source: Veterinary Partner (VIN) →One of the better-tolerated antihistamines in cats.
Skip it or ask a vet first if
Zyrtec-D / decongestant versionskidney disease
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.