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This medication is used to treat people with a certain inherited condition (cystic fibrosis) who have an ongoing lung infection with a certain bacteria (Pseudomonas aeruginosa). People with cystic fibrosis produce thick, sticky mucus that can plug up the tubes, ducts and passageways in the lungs. This can result in serious breathing problems and infections in the lungs. Aztreonam belongs to a class of drugs known as beta-lactams. Aztreonam inhalation solution works by stopping the growth of a certain bacteria (Pseudomonas aeruginosa) that commonly infects the lungs of people with cystic fibrosis. This effect decreases lung infections and damage, decreases the use of other antibiotics, and helps to improve breathing. This antibiotic treats only bacterial infections. It will not work for viral infections (such as the common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections.