Most nasal sprays are safe to use while breastfeeding. Because these medications are applied locally inside the nose, very little is absorbed into your bloodstream, and even less reaches your breast milk. The specific type of nasal spray matters, though, since some categories carry more considerations than others.
Saline Sprays Are Completely Safe
Plain saline nasal sprays contain nothing but salt water. They don’t enter your bloodstream at all, so there is zero risk to your baby. If you’re dealing with congestion from a cold, dry air, or postpartum rhinitis (which affects roughly one in five pregnant and postpartum women), saline spray is the simplest first option.
Steroid Nasal Sprays Are the Top Choice for Allergies
Nasal corticosteroids like fluticasone (Flonase) and budesonide (Rhinocort) are considered the safest and most effective treatment for allergic rhinitis during breastfeeding, according to the American Academy of Family Physicians. The reason comes down to how little of the drug actually gets into your system. Budesonide, for example, is only about 9% bioavailable when swallowed, meaning your body absorbs very little even if some drips down your throat. A fully breastfed infant would receive a maximum of 0.3% of the mother’s weight-adjusted dose, and the baby’s own gut would absorb even less of that.
These sprays work by reducing inflammation directly in your nasal passages. You can use them daily throughout allergy season without significant concern about your milk supply or your baby’s exposure.
Decongestant Sprays: Safe Topically, Risky Orally
Oxymetazoline (the active ingredient in Afrin) is preferred over oral decongestants like pseudoephedrine during breastfeeding. When used as directed in the nose, very little is thought to be absorbed into the body or reach breast milk. The NIH’s LactMed database specifically recommends it over oral systemic decongestants.
The important distinction here is topical versus oral. Pseudoephedrine taken by mouth can reduce milk supply, sometimes significantly. A decongestant spray applied inside the nose works locally and largely stays there. That said, decongestant sprays shouldn’t be used for more than three consecutive days regardless of breastfeeding status, because they cause rebound congestion with prolonged use.
Antihistamine Nasal Sprays Need More Caution
Antihistamine sprays like azelastine (Astelin) are a bit more nuanced. Small, occasional doses are not expected to cause adverse effects in breastfed infants. However, larger doses or prolonged use may cause drowsiness in your baby or reduce your milk supply, especially if you’re also taking an oral decongestant or if your milk supply isn’t well established yet (generally the first four to six weeks postpartum).
In one follow-up study of infants exposed to various antihistamines through breast milk, about 10% of mothers reported irritability or colicky symptoms, and 1.6% reported drowsiness. None of these reactions required medical attention, but they’re worth watching for. Another quirk of azelastine: it has a bitter taste that can transfer to breast milk, and some infants refuse the breast because of it.
Cromolyn Sodium Is Also Considered Acceptable
Cromolyn sodium (NasalCrom) is a mast cell stabilizer that prevents allergy symptoms before they start. Although no published studies have measured its levels in breast milk, an expert panel considers it acceptable during breastfeeding. The reasoning is that maternal milk levels are likely very low, and even if the infant ingested some through milk, cromolyn is poorly absorbed from the gastrointestinal tract. It would largely pass through without entering your baby’s system.
Why Nasal Sprays Are Safer Than Pills
The core principle is simple: a medication sprayed into your nose stays mostly in your nose. Oral medications travel through your digestive system, enter your bloodstream at much higher concentrations, and have a greater chance of reaching your breast milk. This is why nasal corticosteroids are recommended over oral steroids, and why topical decongestant sprays are preferred over pseudoephedrine pills, during breastfeeding.
Timing Your Dose to Minimize Exposure
Even with low-risk nasal sprays, you can further reduce your baby’s exposure with simple timing strategies. For once-daily sprays (like most steroid sprays), use them right after breastfeeding and before your baby’s longest sleep stretch. This gives your body the most time to clear the small amount of drug that does get absorbed before your next feeding session.
If you’re using a spray that requires multiple daily doses, the approach flips slightly: nurse your baby immediately before you take the dose. For high-dose or prolonged steroid use (which is uncommon with nasal sprays but possible), waiting four hours after a dose before nursing can further decrease infant exposure. With standard-dose nasal steroid sprays, this level of caution typically isn’t necessary, since the amount reaching your milk is already negligible.
What to Watch for in Your Baby
With saline and steroid nasal sprays, you’re unlikely to notice any changes in your baby. With antihistamine sprays, keep an eye out for unusual drowsiness, increased fussiness, or feeding refusal. These effects are uncommon and mild when they do occur, but they’re a signal to stop the spray and try a different option. If your baby is a newborn or was born premature, their ability to process medications is lower, so extra attention is reasonable with any medicated spray.