SPL Set ID: a894e40b-77e4-439b-b0f8-9a5cc7a1dd90

Levofloxacin is a synthetic broad-spectrum antibacterial agent for oral administration. Chemically, levofloxacin, a chiral fluorinated carboxyquinolone, is the pure (-)(S)-enantiomer of the racemic drug substance ofloxacin. The chemical name is (-)-(S)-9-fluoro2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid hemihydrate. Figure 1: The Chemical Structure of Levofloxacin The empirical formula is C 18 H 20 FN 3 O 4 • ½ H 2 O and the molecular weight is 370.38. Levofloxacin is a light yellowish-white to yellow-white crystal or crystalline powder. The molecule exists as a zwitterion at the pH conditions in the small intestine. The data demonstrate that from pH 0.6 to 5.8, the solubility of levofloxacin is essentially constant (approximately 100 mg/mL). Levofloxacin is considered soluble to freely soluble in this pH range, as defined by USP nomenclature. Above pH 5.8, the solubility increases rapidly to its maximum at pH 6.7 (272 mg/mL) and is considered freely soluble in this range. Above pH 6.7, the solubility decreases and reaches a minimum value (about 50 mg/mL) at a pH of approximately 6.9. Levofloxacin has the potential to form stable coordination compounds with many metal ions. This in vitro chelation potential has the following formation order: Al +3 >Cu +2 >Zn +2 >Mg +2 >Ca +2 . Excipients and Description of Dosage Forms Levofloxacin Oral Solution, USP Levofloxacin Oral Solution, USP 25 mg/mL, is a multi-use self-preserving aqueous solution of levofloxacin, USP with pH ranging from 5.0 to 6.0. The appearance of Levofloxacin Oral Solution, USP may range from clear yellow to clear greenish-yellow. This does not adversely affect product potency. Levofloxacin Oral Solution, USP contains the following inactive ingredients: artificial bubble gum flavor, artificial grape flavor, ascorbic acid, benzyl alcohol, glycerin, hydrochloric acid, propylene glycol, purified water, saccharin sodium, and sucrose. Sodium hydroxide may be used to adjust pH. Structure