Aztreonam
Cayston is an inhaled antibiotic medication containing aztreonam lysine, designed specifically for patients with cystic fibrosis. It is used to manage chronic respiratory infections caused by Pseudomonas aeruginosa bacteria in the lungs. Cayston is administered via nebulizer, typically three times daily, to help reduce lung infection symptoms and improve breathing.
Cayston is an inhaled antibiotic used to treat Pseudomonas aeruginosa lung infections in cystic fibrosis patients.
Key facts at a glance
- RxNorm
- 901611
- Generic
- Cayston
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Cayston is indicated for the treatment of respiratory infections caused by Pseudomonas aeruginosa in cystic fibrosis patients aged 6 years and older. It helps manage chronic lung infections and improves respiratory symptoms.
Cayston contains aztreonam lysine, a monobactam antibiotic that works by inhibiting bacterial cell wall synthesis. When inhaled, it delivers the medication directly to the lungs where it targets and kills Pseudomonas aeruginosa bacteria.
Cayston is administered using a specific nebulizer system (Altera) and should not be mixed with other nebulized medications. Common side effects may include cough, throat irritation, and headache. Patients should complete the full prescribed course and inform their doctor of any allergies, particularly to other antibiotics.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy