Is Sudafed safe while breastfeeding?

What does the evidence say about Sudafed while breastfeeding?

1. A single 60 mg oral dose of pseudoephedrine produced a mean 24 percent decrease in milk production over the following 24 hours in nursing parents. 1
2. Repeated use seems to interfere with lactation, and parents of newborns whose lactation is not yet well established, or who are already struggling to make enough milk, should not receive pseudoephedrine. 1
3. Only a small amount passes into milk at recommended doses, but pseudoephedrine might lower how much milk your body makes, so a noticeable drop is worth reporting to your provider or a lactation specialist. 2
4. Irritability was reported in 20 percent of exposed infants in one study, and a fully breastfed baby receives about 4.3 percent of the weight-adjusted maternal dose. 1
5. Loratadine at its lowest dose is recommended as a preferred antihistamine during breastfeeding, though it may still weigh on lactation when it is combined with a sympathomimetic such as pseudoephedrine. 3

How Sudafed changes by nursing stage

• Early weeks. This is the riskiest window, because supply is still being established and a single dose can set it back. The lactation record specifically flags parents whose lactation is not yet established.
• Established nursing. A settled supply has more buffer, but the 24-hour dip is still real. One dose, taken with a plan to nurse or pump often afterward, is a different situation from four days of it.
• Weaning. If you are already reducing feeds, a supply dip matters less. If you are not ready to wean, this is the drug most likely to make that decision for you.