This reduces seizures and makes you feel sleepy. How is phenobarbital supplied (dosage forms)? Phenobarbital is available in the following dosage forms that are taken by mouth. 20 mg/5 mL oral ...

The typical dosage of phenobarbital for dogs is 2-4 milligrams per kilogram of your dog’s weight. It is given orally twice a day. Give your dog phenobarbital only under the guidance of your ...