Ceftazidime-d5 (GR20263-d5) is the deuterium labeled Ceftazidime (HY-B0593). Ceftazidime (GR20263), an antibiotic, has a broad spectrum activity against Gram-positive and Gram-negative aerobic bacteria. Ceftazidime is also active against Enterobacteriaceae (including beta-lactamase-positive strains) and is resistant to hydrolysis by most beta-lactamases[1].