The medications listed in Worsen During Pregnancy can all be used while you are breast-feeding your baby. However, most of these medications will pass from the bloodstream into the breast milk and cause similar systemic side effects as those seen in the mother.
Therefore, older, sedating anti-histamines such as diphenhydramine and chlorphen-iramine may also result in significant sedation in the nursing infant. Topical medications, such as intranasal steroids and intranasal antihistamines, are not typically well absorbed into the bloodstream and will therefore have minimal effects on the baby.