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Hello, I'm Dr.Jamie. Do you know approximately how many grams of it he ate?
That amount can be dangerous for sure, he may have vomited it back up, but since we really don't know that we must not assume. It can take 18-72 hours for the prison to start working usually but it can also take the treatment (vitamin K) 24 hours to start working. So I wound recommend taking him in right away to be in the safe side.