Recently Blind 4-year Old Cat

Question
4 weeks ago, my 4 year old cat, Fred, was sniffling and sneezing.  Took him to the vet.  Was diagnosed with a virus.  He got an antibiotic shot and also a shot for a tapeworm (discovered at the vets office).  I tried to follow-up with antibiotic syringe ... but was unsuccessful (Fred has sharp claws and is a wirey little dude).  Anyway, Fred seemed fine.  A week later, I came home to find him very weak, sniffly, eyes closed, having a hard time breathing.  Took him back to the vet who said he probably relapsed from the virus that he had.  Thought he heard some sounds in his lungs.  Fred stayed with the vet for 4 nights .. where they pumped him with antibiotics (for pneumonia).  When we were able to take Fred home, we put him in the car where he proceeded to have a violent seizure (I have never witnessed one of these before).  We immediately took Fred back in to the vet.  The Vet didn't seem to think that he had a seizure but wanted to keep him one more night ... and to take an Xray of his lungs to make sure he didn't have a tumor (he was wondering what was causing the pneumonia).  Xray was clean ... so Fred came home the next day.  When we got him home his behavior was very strange!  He was ravenous and paced constantly.  He bit my hand and attacked my toes.  I called the vet.  The vet said they gave him a cortisone shot and that he'd probably be 'weird' for 3 - 5 days.  Later that night, Fred had a second seizure.  Emergency people told us to watch him to make sure he didn't have another.  He was OK the rest of the night .. although he paced and ate like a pig!  The next morning (a Saturday) we took him to another vet (his original vet couldn't see him until the following Monday).  This vet ordered his records and questioned the quantity of medication and the combinations.  She also ran bloodwork and found no abnormalities.  She did note, however, that one of his pupils seemed larger than the other.  She suggested we stop any and ALL medications ... thinking that the seizures might be caused by the meds.  She mentioned he may have a brain tumor (only an MRI would confirm ... at cost of approx $1K).  We decided to get his system cleared of all meds ... and hoped he'd get better.  As the days have gone by (3 weeks now), we've realized that he's become blind (his pupils are fully dialated at all times).  He seems to maybe see shadows because he's not walking into anything but he's cautious and extremely anxious and seems to stare at legs as we walk by.  He doesn't seem like the same cat ... he's quick to lash out (sharp claws) and I'm certain he would not hesitate to bite if touched.  I'm wondering if he is behaving like this because of his sudden blindness .. or if perhaps, he has some sort of brain issue.  Right now I don't like living with him because we are all afraid when he's up and about the house.  We cannot walk past him without fear of getting swiped or lunged at.  Some days he seems a little less fearful .. but not to the point where I feel comfortable touching him.  I'm wondering whether or not he'll possibly "settle in" and quit being so anxious ... or if we should just go ahead and have him put to sleep.  He seems to be eating and drinking and using his litter box.  We do have a second cat with whom he seems to want to follow (she hisses at him and won't allow him to get too close).  I'm wondering if this behavior is normal for a newly blinded cat ... or if we should not expect him to return to be a normal docile cat.

Answer
Hi Vickie!  It is very possible that the siezuring was caused by the medications, as cats' systems are very sensitve.  Also, if the antibiotic Fred was given was an antibiotic called Baytril, this medication is known to cause blindness in felines.  The behavior Fred has taken to is definately a normal behavior for a newly blind cat.  He will learn to depend on his other senses, so be patient, as it may take some time.  Be sure to talk to him alot as blind cats depend on their hearing very much.  
I would also recommend a different veterinarian.  At any time, when an animal siezures, it means that there is something wrong, that there is a reaction to something going on, or that the cat's temperature has elevated to an unnatural level.  
Just a quick question:  Did you by chance put any Hartz, Biospot, Zodiac, Advantage, Advantix, ect...(any other anti flea medication except Frontline) on your cat?  These are symptoms that seem to be occuring with these over the counter flea medications.  Just to let you know, as I have been seeing so many reactions and fatalities from these products.
I would definitely give him a chance before putting him to sleep.  He is a very young cat and he has been through a very traumatic time.  I have five cats, one who is a sickly kittie.  Everytime he is at the veterinarian, he comes home and behaves how Fred is behaving.  Add blindness and siezuring to that and I would think that Fred is actually reacting pretty well!  Give him a chance, he will get used to his new life and will learn to depend on his other senses to enjoy his life to the fullest.
I hope this has helped and please keep me posted!
Hilary