Ceftazidime is a third-generation cephalosporin antibiotic used to treat a wide range of serious bacterial infections. It is particularly effective against Gram-negative bacteria, including Pseudomonas aeruginosa. Ceftazidime works by inhibiting bacterial cell wall synthesis, leading to cell death. It is commonly administered via injection or intravenous infusion in hospital settings for conditions such as pneumonia, urinary tract infections, skin infections, and sepsis.