My daughter (24 y/o, double delta F508) is currently taking polymyxin b. Yes, she is down to the last of the antibiotics that may help her. Has anyone else taken this drug and what was your experience with it? She is experiencing tingling in her fingertips and some numbness in her tongue and face. IV diphenhydramine is administered before she starts it to help with itchy skin. The ID docs are hoping she can tolerate 7 days minimum but are hoping for 14 days. That is not likely. She is a double lung pre-transplant candidate, waiting on her Cocci titers to get low enough to be listed.