Did your Vet not give you instructions on how to use it? All I can find on this medication is that's it's to be given with food. I take that to mean that opening the capsule and mixing it with food would be just fine, but I would think your Vet would be the best person to ask, since I do know there ARE some meds that are not even supposed to be cut in half to be given (like Denamarin) Since this is in a capsule, though, I would think it's fine, if you can get your cat to eat it
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I would try to find the stinkiest food you can find to mix it in, unless your cat isn't a picky eater.
My vet just prescribed this medication for our kitty for urethra spasms. How is your kitty doing on this med? Any bad side effects or anything I should watch for? Hope your kitty is doing well.