4 Ask Your Vet. Dont give more than 125 mg which is one half of a pink tablet. In case you want to opt for the IM injection method you need to give your cat 05 mg to 1 mg per body pound.
It is also simple to disguise the liquid form of Benadryl in your cats food or drink for the fussiest purring prince or princess. A 3 mg dose for a cat 12 mL. You will still have to force it down his throat. This means a 125-pound cat will take half of a 25 mg Benadryl tablet up to three times a day depending on your veterinarians recommendation.