Advice for mothers using Loratadine while breastfeeding. Includes possible effects on breastfed infants and lactation. Claritin and Milk Supply? - Breastfeeding Moms Communities; Parenting; Pregnancy; Food & Fun;. I also looked it up on LactMed. The one I took was only Loratadine. Are your allergies bothering you? Here is the information you need about the safety of Claritin and breastfeeding for you and your baby. Relief from allergies is important, and safely while breastfeeding is even more important. Do Claritin and breastfeeding mix? What about other medications? Claritin and Milk Supply? Today my physician prescribed Claritin for my very persistent sinus problems and. Claritin is fine as is Allegra. Dont take the D formulations- they have pseudophedrine, which lowers supply. Zyrtec isn't approved for breastfeeding. The common cold will usually run its course within 7 to 14 days. There are many natural remedies and over the counter products that are compatible with breastfeeding.