Neomycin + Polymyxin B + Gramicidinis a drug made up of Neomycin, Polymyxin B and Gramicidin.It is an eye anti-Infective and antiseptic. Neomycin is an aminoglycoside antibiotic that inhibits bacterial protein synthesis. Polymyxin B is a lipopeptide antibacterial that is effective against gram-negative bacteria. Gramicidin is a polypeptide antibacterial that is effective against gram-positive bacteria.