The safest options for congestion while breastfeeding are nasal sprays and steroid sprays rather than oral decongestants. A single 60 mg dose of pseudoephedrine (Sudafed) can reduce milk supply by 24%, making it one of the worst choices for nursing parents. Fortunately, several alternatives work well without putting your supply at risk.
Why Oral Decongestants Are a Problem
Pseudoephedrine is the most effective oral decongestant on the market, but it’s also the most problematic during breastfeeding. A study published in the British Journal of Clinical Pharmacology found that a single standard dose reduced 24-hour milk production from 784 ml to 623 ml, a 24% drop. That’s a meaningful decrease, especially if you’re already working to maintain supply.
Phenylephrine, the other oral decongestant commonly sold as a Sudafed alternative, isn’t a great swap. It has very low oral bioavailability, meaning it barely works for congestion in the first place. It may also reduce milk production, and there’s not enough data on its use during breastfeeding to confirm safety. The NIH’s Drugs and Lactation Database recommends choosing a different option, particularly if your baby is a newborn or was born preterm.
Nasal Sprays: The Best First Choice
Oxymetazoline nasal spray (sold as Afrin) is one of the most practical options. It works directly on swollen nasal tissue and absorbs very little into your bloodstream, so almost none reaches your breast milk. The Drugs and Lactation Database specifically recommends it over oral decongestants like pseudoephedrine for breastfeeding parents. The catch with any decongestant nasal spray is the three-day limit. Using it longer can cause rebound congestion that’s worse than the original stuffiness.
Nasal steroid sprays like fluticasone (Flonase) are another strong option, especially if your congestion is allergy-related or lingering. The amount absorbed into your bloodstream from a nasal spray is extremely small, and the amount that would then transfer to breast milk is considered negligible. These sprays take a day or two to reach full effect, so they’re better for ongoing congestion than acute relief.
Saline nasal rinses (neti pots or squeeze bottles) contain no medication at all and can flush mucus and irritants from your nasal passages. They won’t match the power of a decongestant spray, but they’re completely safe and can be used as often as needed. Many people find them most helpful when used right before bed or first thing in the morning.
What to Know About Antihistamines
If your congestion is caused by allergies rather than a cold, antihistamines can help. Second-generation options like loratadine (Claritin) and cetirizine (Zyrtec) are generally preferred because they cause far less drowsiness. Occasional cases of reduced milk supply have been reported with both, but this appears uncommon. In a survey of 51 breastfeeding mothers taking loratadine, only one reported a decrease in milk production.
First-generation antihistamines like diphenhydramine (Benadryl) are more problematic. They pass into breast milk in small amounts and can cause drowsiness not just in you but in your baby. Studies have reported irritability and changes in sleep patterns in breastfed infants exposed to diphenhydramine. These older antihistamines may also reduce milk supply. If you need an antihistamine, loratadine or cetirizine is the better pick.
Avoid Multi-Symptom Formulas
Products like DayQuil, NyQuil, and other combination cold medicines bundle several active ingredients together, and you’ll often end up taking something you don’t need or something that’s risky for breastfeeding. Many contain pseudoephedrine or phenylephrine. Some include codeine, which should be avoided. Extended-release and extra-strength versions keep higher drug levels in your system for longer, increasing the amount that passes into milk.
The smarter approach is to use single-ingredient products targeted at your specific symptom. If you only have congestion, you only need a decongestant, not a formula that also contains a cough suppressant, pain reliever, and antihistamine. This minimizes both your baby’s exposure and the risk of side effects on your supply.
Timing Medication Around Feedings
For any medication you do take, timing matters. Drug levels in breast milk generally follow drug levels in your blood, peaking sometime after you take a dose. The American Academy of Family Physicians recommends nursing your baby right before taking a dose, so the medication has time to clear before the next feeding. For medications taken once daily, the ideal window is right after the bedtime feeding, just before your baby’s longest stretch of sleep.
This strategy won’t eliminate drug transfer entirely, but it meaningfully reduces how much your baby is exposed to during the feeding when milk drug levels would be highest.
A Practical Plan for Congestion Relief
Start with saline rinses and a nasal steroid spray if you have one available. These carry essentially zero risk to your milk supply or your baby. If you need faster or stronger relief, an oxymetazoline spray like Afrin can clear significant congestion within minutes, just keep it to three days or fewer. For allergy-driven congestion, add loratadine or cetirizine.
Other basics help more than people expect. Running a humidifier in your bedroom, elevating your head while sleeping, staying well hydrated, and using steam from a hot shower can all thin mucus and ease that stuffed-up feeling. Stacking these non-drug approaches with a targeted nasal spray is often enough to get through a cold without reaching for anything that could affect your supply.