Ceftazidime is a broad-spectrum antibiotic belonging to the cephalosporin class. It is primarily used to treat serious infections caused by gram-negative bacteria, including Pseudomonas aeruginosa. This medication works by inhibiting bacterial cell wall synthesis, leading to the death of the bacteria. Ceftazidime is often administered intravenously or intramuscularly in a hospital setting. It is commonly prescribed for conditions such as pneumonia, urinary tract infections, and skin infections. As with any antibiotic, it is important to complete the full course of treatment to prevent antibiotic resistance.