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Bethkis and Breastfeeding

Although the active ingredient in Bethkis does pass through breast milk when given as an injection in rats, it is unknown if Bethkis (which is inhaled) would also pass through. Due to the unknown risks, the manufacturer of the drug recommends that women not breastfeed during treatment. If you are thinking about using this medication while nursing, talk to your healthcare provider.


Can Breastfeeding Women Use Bethkis?

Bethkis® (tobramycin inhalation solution) is a prescription medication used to treat certain infections in people with cystic fibrosis. It is inhaled by mouth into the lungs.
At this time, it is unknown whether Bethkis passes through breast milk. Therefore, if you are breastfeeding or plan to start, talk with your healthcare provider before using this medication.

More Information About Bethkis and Breastfeeding

Bethkis has not been studied in breastfeeding women. It contains the antibiotic tobramycin, which is known to pass through breast milk in small amounts when given as an injection.
As mentioned, Bethkis is not an injectable medicine -- it is inhaled into the mouth. It is unknown whether enough inhaled Bethkis reaches the bloodstream for the drug to pass through breast milk. It is likely, however, that if it does pass through breast milk, it would only be in very small amounts.
However, Bethkis is associated with serious side effects, including kidney problems and hearing loss. If the drug does pass through breast milk, there is the potential that a nursing infant could be at risk for these side effects. Because of these possible risks, the manufacturer recommends women not breastfeed while using Bethkis.
If your healthcare provider recommends Bethkis while breastfeeding, watch for any possible side effects in your infant. Report any possible problems to your child's healthcare provider, such as:
  • Difficulty feeding
  • Unexplained or excessive crying
  • Problems with hearing
  • Breathing problems, such as coughing or wheezing
  • Oral thrush (a yeast infection in the mouth)
  • Diarrhea
  • Diaper rash
  • Bloody stool
  • Anything else that just doesn't seem right.
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Bethkis Medication Information

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