Flumequine

A quinolizine carboxylic acid in the quinolone family of synthetic antibiotics, deployed against gut infections in livestock. Treated animals may carry residues in tissues or milk, so withdrawal periods and maximum residue limits apply before animals or milk enter the food chain. As a first-generation quinolone it inhibits bacterial DNA gyrase, active mainly against Gram-negative enteric pathogens. Veterinary use is declining as newer fluoroquinolones replace it, but where authorised, statutory withdrawal periods for meat and milk plus MRL enforcement guard against residues reaching consumers.