Purity ~90%. Levofloxacin is a synthetic chemotherapeutic antibiotic of the fluoroquinolone drug class[1][2] and is used to treat severe or life-threatening bacterial infections or bacterial infections that have failed to respond to other antibiotic classes.[3][4] It is sold under various brand names, such as Levaquin and Tavanic, the most common. In form of ophthalmic solutions it is known as Oftaquix, Quixin and Iquix. Levofloxacin is a chiral fluorinated carboxyquinolone. Investigation of ofloxacin, an older drug that is the racemic mixture, found that the l form [the (-)-(S) enantiomer] is more active. This specific component is levofloxacin.[5][6] Levofloxacin interacts with a number of other drugs, as well as a number of herbal and natural supplements. Such interactions increase the risk of cardiotoxicity and arrhythmias, anticoagulation, the formation of non-absorbable complexes, as well as increasing the risk of toxicity.[7] Levofloxacin is associated with a number of serious a