Lomefloxacin-d5 (hydrochloride) is the deuterium labeled Lomefloxacin hydrochloride. Lomefloxacin (SC47111A) hydrochloride is a broad-spectrum quinolone antibiotic, with antimicrobial activity. Lomefloxacin hydrochloride is used for the research of respiratory tract infections, genitourinary infections, gastrointestinal infections, ENT infections, etc.[1][2].