Ceftazidime (pentahydrate) (Standard) is the analytical standard of Ceftazidime (pentahydrate). This product is intended for research and analytical applications. Ceftazidime (GR20263) pentahydrate , an antibiotic, has a broad spectrum activity against Gram-positive and Gram-negative aerobic bacteria. Ceftazidime pentahydrate is also active against Enterobacteriaceae (including beta-lactamase-positive strains) and is resistant to hydrolysis by most beta-lactamases[1].