Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you. I apologize no expert has answered until now but not many of us are available overnight.
This is a medical emergency. You need to take your cat in to your vet or your closest emergency clinic. There is not a "safe" dose of rimadyl in cats. They are at high risk for kidney failure, stomach ulceration and possibly liver issues. The treatment is intravenous fluids until we feel the kidneys are safe (2-3 days), treatment for any digestive tract issues and possible activated charcoal (too late to induce vomiting). I am not concerned about the thyroxine. This will go through the system quickly. At a minimum have her examined and then her lab work checked to look for liver/kidney problems.
Without treatment or delaying therapy could results in kidney failure, which may not be reversible.
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