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This is Dr. KV. I'm here to help with your dilemma with the kitties.
How old are your 2 kittens?
Ok, thank you. Are either of them acting sick?
That dose would be a very large dose for either kitty. It could cause severe stomach upset such as vomiting and diarrhea. How long ago do you think they may have eaten it?
Yes, this is a tough situation! Especially since there are 2 kittens and we don't know who ate it, or if either of them actually ate it. However, if one of them did get it, it could be a serious problem. I suggest taking them both in to your local ER vet to induce vomiting. Unfortunately, both kittens would need to go, but it would be the only way to ensure neither of them would be affected by the overdose.
I truly hope you find the pill!
Please feel free to reach out if you need further assistance.