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I am sorry to hear about what happened with Sage. My name is Rebecca. I am a veterinarian and will do my best to help.
It is not as common for cats to eat pills spilled on the floor, as with dogs. Few medications taste or smell good enough to tempt them.
Is it possible to count the spilled pills and make a very rough guess of how many are missing?
If she did eat Synthroid pills, it depends on how many she ate to predict what to expect. This medication can raise her blood pressure, cause vomiting and diarrhea, and make her act hyperactive for a period of time. I would watch her to see if she is eating and acting normally, and if she still seems OK in 4 to 6 hours, she probably did not get any or at least not enough to do any harm.
Pleaes let me know how she is doing and what else I can answer.
If she ingested only one or two pills, she will probably be fine. If she ate enough to cause symptoms, there is no antidote. The treatment would be "symptomatic": treat her symptoms until the worst is over. If her blood pressure got too high, or if she were hyperactive to the point of getting tremors or fever, we would give medication to stablilize her.
Knowing how hard it is to get a cat to take a pill, it is probably not likely she did eat any. Sleeping is a good sign. Let me know how she is doing and if this is helpful, kindly consider rating my answer!
How is Sage doing? If I can help with or answer anything else, please let me know. Kindly consider rating my answer to let the website know I assisted you.