Polymyxin wani nau'in maganin rigakafi ne wanda ke cikin nau'in maganin rigakafi na polymyxin. Ana amfani da shi don magance cututtukan ƙwayoyin cuta, musamman waɗanda kwayoyin cutar gram-negative ke haifarwa. Kalmar "polymyxin" ta samo asali ne daga kalmomin Helenanci "poly" wanda ke nufin "da yawa" da "myxa" wanda ke nufin "manufa."
