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DESCRIPTION Ciprofloxacin Ophthalmic Solution is a synthetic, sterile, multiple dose, antimicrobial for topical ophthalmic use. Ciprofloxacin is a fluoroquinolone antibacterial active against a broad spectrum of gram-positive and gram-negative ocular pathogens. It is available as the monohydrochloride monohydrate salt of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline-carboxylic acid. It is a faint to light yellow crystalline powder with a molecular weight of 385.8. Its empirical formula is C 17 H 18 FN 3 O 3 •HCl•H 2 O and its chemical structure is as follows: Ciprofloxacin hydrochloride Ciprofloxacin differs from other quinolones in that it has a fluorine atom at the 6-position, a piperazine moiety at the 7-position, and a cyclopropyl ring at the 1-position. Each mL of Ciprofloxacin Ophthalmic Solution contains: Active: ciprofloxacin HCl 3.5 mg equivalent to 3 mg base. Preservative: benzalkonium chloride 0.006%. Inactives: sodium acetate, acetic acid, mannitol 4.6%, edetate disodium 0.05%, hydrochloric acid and/or sodium hydroxide (to adjust pH) and water for injection. The pH is approximately 4.5 and the osmolality is approximately 300 mOsm. Ciprofloxacin hydrochloride