You might ask your vet about the following. Baby's vet recommends Chlorpheniramine for allergies. You can get the generic human form over the counter in a 4 mg tablet. Baby weighs 15 pounds and it's recommended he take 1/2 tablet 2xday as needed. You have to make sure that Chlorpheniramine is the ONLY active ingredient in the brand you pick up because otherwise you risk poisoning your kitty.