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The antibiotic Cayston is prescribed for the treatment of a certain bacterial infection in people who have cystic fibrosis. By preventing the bacteria from growing and multiplying, this drug can help improve respiratory symptoms, such as wheezing, coughing, and mucus production. It comes as a powder that is inhaled three times daily. A stuffy nose and sore throat are some of the possible side effects.


What Is Cayston?

Cayston® (aztreonam for inhalation solution) is a prescription medication approved to improve respiratory symptoms, such as coughing, wheezing, and mucus production, in people with cystic fibrosis who have an infection with the bacteria Pseudomonas aeruginosa. P. aeruginosa is one of the most common causes of chronic lung infections in people with cystic fibrosis.
Cayston contains the antibiotic aztreonam. It belongs to a class of antibiotics known as monobactams. The medication is used in a nebulizer, which is a device that turns liquid medicine into a fine mist that can be inhaled into the lungs. Aztreonam is also available in an injectable form called Azactam® (aztreonam injection), which is used to treat various infections, including infections of the urinary tract, skin, and lungs.  
(Click Cayston Uses for more information on this topic, including possible off-label uses.)

Who Makes This Medication?

Cayston is made by Gilead Sciences, Inc.

How Does Cayston Work?

As mentioned, Cayston is an antibiotic medicine that works by killing bacteria. It does this by preventing the bacteria from making their cell walls. Because bacteria need their cell walls to survive, this medicine causes the bacteria to die.

Cayston Inhaled Therapy Information

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