Neomycin is a broad-spectrum aminoglycoside antibiotic drug that is derived from the metabolic products of Streptomyces fradiae. Neomycin is a complex comprised of three components, neomycin A, B, and C. Neomycin B, also known as [framycetin], is the most active component of the complex and neomycin C is the isomer of neomycin B, making these two stereoisomers the active components of neomycin.