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Hi there - thanks for your question :) In order to give you the most appropriate answer, I'd like to ask you for some more information.
What is your kitty being treated for that these medications were prescribed?
Does her breathing seem labored at all? If you can count a respiratory rate, that would also be very helpful. One cycle of "in-out" is one breath.
Has she ever had mirtazapine before?
Has she had the buprenex tonight as well?
If you can check her gum color - what does it look like?
I look forward to your response :)