Polymyxins

Polymyxin B sulfate and colistin: old antibiotics for emerging multiresistant gram-negative bacteria
Ann Pharmacother. 1999 Sep;33(9):960-7.
The use of intravenous and aerosolized polymyxins for the treatment of infections in critically ill patients: a review of the recent literature
Clin Med Res. 2006 Jun;4(2):138-46.