Gramicidin suna ne da ke nufin maganin rigakafi na polypeptide wanda ƙwayar ƙasa Bacillus brevis ke samarwa. Ana amfani da ita a matsayin magani mai zafi a cikin magunguna don maganin cututtukan fata, kuma ana amfani da ita azaman sinadari a cikin wasu nau'ikan digon ido don magance ciwon huhu.
