Please see link below for full information about taking Claritin D during pregnancy and breastfeeding.
Loratadine/pseudoephedrine Breastfeeding Warnings
Loratadine concentration in human milk approximate that found in the serum of the mother. Approximately 0.029% of the administered dose is excreted in human milk. Pseudoephedrine is also excreted into human milk. Three mothers given pseudoephedrine demonstrated milk concentrations consistently higher than plasma concentrations. Maximum milk concentrations were reached at 1 to 1.5 hours after dosing. In one woman, the milk:plasma concentration ratio at 1, 3, and 12 hours was 3.3, 3.9, and 2.6. The authors calculated that 1000 mL of breast milk consumed over 24 hours would provide an infant with 0.25 to 0.33 mg of pseudoephedrine or 0.5% to 0.7% of the dose ingested by the mother. There are no reports of adverse effects in infants who were exposed to pseudoephedrine by breast milk. The American Academy of Pediatrics considers pseudoephedrine to be compatible with breast-feeding. The manufacturer recommends that due to the potential for serious adverse reactions in nursing infants, a decision should be made to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother.
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