Ceftazidime Products | Cleanchem - Ceftazidime is a third-generation cephalosporin with strong activity against Gram-negative bacteria, including Pseudomonas aeruginosa. It is commonly used to treat hospital-acquired infections like pneumonia, urinary tract infections, and meningitis. It is administered intravenously or intramuscularly. Resistance may develop when used frequently, so it is often reserved for serious infections.