We have a 12 year old female domestic shorthair cat. She has been taking phenobarbital for seizures for 5 years. Starting a few weeks ago, she has been acting "drunk" - staggering, trouble walking on stairs. It appears to be some sort of leg weakness. We recently increased her dose from 15 mg. daily to 18 mg. because her seizures started happening. The vet thinks it's just a reaction to the increased dosage and that she will get used to it. Has anybody had a similar experience with a cat on phenobarbital? Thank you for any help!!