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Hello, my name is***** and I have over 20 years of experience as a veterinarian. I am sorry to hear that your kitty has intervertebral disc disease. That is something we see more commonly in dogs, but it can happen in cats too.
Tramadol is a pain medication in the opiod family of medications. We don't often use it in cats because its effects are unreliable, it can have the reverse effect on cats making them hyper and agitated rather then controlling their pain. Side effects seen in cats with Tramadol use are stomach upset, dilated pupils and anxiety, depression or confusion, and being unsettled. Some cats vocalize quite a bit when taking Tramadol and may even seem to hallucinate. Long term use can cause constipation.Rarely we can see severe respiratory depression, a very slow heart rate, and coma. I don't recommend using it unless we have exhausted all other options, and then only if the owner is prepared that it may make things worse.
I recommend using a combination of steroids and buprenorphine for cats that are in significant pain. We can add Gabapentin or Amantadine if those drugs aren't enough. I would discuss those options with your veterinarian.