Cayston and Breastfeeding
The American Academy of Pediatrics considers Cayston (aztreonam for inhalation solution) compatible with breastfeeding. Although the active ingredient in the drug may pass through breast milk, it is expected that only a small amount would reach a nursing infant. Also, very little of this drug would be absorbed into a child's bloodstream once it reaches the digestive system.
Cayston® (aztreonam for inhalation solution) is a prescription medication used to treat people with cystic fibrosis who have an infection with the bacteria known as Pseudomonas aeruginosa. It belongs to a group of medicines known as monobactam antibiotics. Cayston is inhaled into the lungs using a nebulizer.
Cayston passes through breast milk. Therefore, if you are breastfeeding or plan to start, talk with your healthcare provider before using this medication.
Cayston contains the antibiotic aztreonam, which has been shown to pass through breast milk in small amounts when it was given to lactating women as an injection.
It is important to note that Cayston is an inhaled antibiotic, and very little of the drug is expected to reach the bloodstream after normal use. Therefore, the amount of drug found in breast milk would be even smaller than the amount found after an aztreonam injection.
In addition, Cayston is not well absorbed from the gastrointestinal tract into the body. This means that even if a nursing infant swallows breast milk containing Cayston, very little of the drug would likely be absorbed into the infant's bloodstream.
Based on the information available, Cayston is unlikely to cause problems in a nursing infant. In fact, the American Academy of Pediatrics considers the medication compatible with breastfeeding.