my insurance kept denying it because it was an "injectable medicine" even though I was prescribed it by inhalation. I sent in appeal after appeal after appeal, even going so far as to send them research studies about the benefits of inhaled colistin in pwcf. I had my doctor write letter after letter, and still it was not covered. My new bacteria is resistant anyway, so I'm on inhaled amikacin now... but I never got it approved. UGH. Insurance companies make me so mad sometimes with the hoops that they want me to jump through.