Can I Give My Cat Chlor-Trimeton?

Yes, with care
Chlorpheniramine is commonly referenced for cats at published doses. Published guidance for cats: 1-2 mg per cat, every 12h. Frequently used in cats; bitter taste.
Source: Merck Veterinary Manual
Get the exact range for your cat's weight

Skip it or ask a vet first if

glaucomaurinary obstruction

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.