quinolone antibiotic quinolone antibiotic quinolone antibiotics constitute a large group of broad-spectrum bacteriocidals that share a bicyclic core structure related to the substance 4-quinolone. they are used in human and veterinary medicine to treat bacterial infections, as well as in animal husbandry, specifically poultry production. quinolonedrug classthe second generation fluoroquinolone, ciprofloxacin. the two ringed nitrogen containing system with a ketone is called a quinolone.class identifiersusebacterial infectionatc codej01mclinical datadrugs.comdrug classes