Levofloxacin hydrate. Molecular model of the drug levofloxacin hydrate (C18.H20.F.N3.O4?1/2H2.O). This antibiotic, sold under the brand name Levaquin, is used to treat a number of bacterial infections including acute bacterial sinusitis, pneumonia, urinary tract infections, chronic prostatitis, and some types of gastroenteritis. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (dark blue), oxygen (red) and fluorine (light blue).