ive been lurking for awhile and this my first post. my cat had a tooth pulled yesterday and has on a fentanyl patch & i give her buprenex. since i got her home and still to this min she has been purring nonstop. last night i wasnt able to sleep with her constant purring and headbutting for attention. she has never woken me in my sleep before in all her 16 yrs. so i'm thinking this fentanyl must really be some good stuff. i was also told when i picked her up by the vet tech that her kidney values had increased since her last blood panel. i haven't talked to the vet yet only saw her notes. should i be concerned about that? note also said i should have it rechecked in 6-12 mos. any advice would be appreciated also is fentanyl addictive?