NCIt definition : The sodium salt of ceftazidime, a third-generation cephalosporin antibiotic with bactericidal
activity. Ceftazidime binds to and inactivates penicillin-binding proteins (PBPs),
enzymes located on the inner membrane of the bacterial cell wall, resulting in the
weakening of the bacterial cell wall and cell lysis. Compared to the second and first
generation cephalosporins, ceftazidime is more active against gram-negative bacteria
and less active against gram-positive bacteria. Ceftazidine also crosses the blood-brain
barrier and reaches therapeutic concentrations in the central nervous system (CNS).
PBPs participate in the terminal stages of assembling the bacterial cell wall, and
in reshaping the cell wall during cell division. Inactivation of PBPs interferes with
the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength
and rigidity.;