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Even the mildest of sedatives can take a while to wear off on cats. Their bodies does not metabolize medications the way that dogs or humans do. A mild sedative can last 8-12 hours before the kitty is back to his normal self. I would not panick. This is not something to worry about depending on the weight of the kitty and the dose of the sedative it may take a little longer to wear off, than you would expect. Joan
You are welcome ! Give him another few hours and he should start feeling better. Joan