We almost gave up hope, so glad we kept trying!
Nelly has focal seizures. She was thrown into our garden when she was a few months old. She had one after we had her for about a month. It lasted a couple of minutes and she recovered quickly. After that she had one every 3 months or so, so she wasn't put onto medication. Then about 4 months ago she went into a trance like state. We tried Keppra at first, that didn't really work at all, although we gave it a couple of months. Our vet, who specialises in neurology, gave her a rescue dose of diazepam which worked for a day or two. She also prescribed phenobarbital. For 2 weeks she came out of it but then slowly went back into it. We took her back for blood tests to get her levels checked. The blood was sent to Germany and the results came back 2 weeks later. Her levels were fine, she should have responded as they were supposedly at a therapeutic level. So our vet gave us some Keppra to add to the phenobarbital. Unfortunately Nelly had a really bad reaction and she totally freaked out on it, so we had to stop it. I usually give Nelly her meds but I had to go away for a couple of days, so my partner gave it to her instead. She suddenly improved! She had secretly added an extra quarter of a tablet at bedtime. Within 2 days she was completely back to her normal self! She has now been fine for a month! She also has MCT oil for her liver function. We told our vet and she said that science said that we shouldn't up the dose but that in real life it had worked, so she very much approved! She also said that owners know their dogs better than the experts, so always question your vet if you don't agree with them.