Chlorpheniramine and Breastfeeding
The full risks of using chlorpheniramine while breastfeeding are not currently known. The drug could theoretically affect a woman's milk supply because it can suppress the hormone that is important for breast milk production. However, various sources suggest that the medicine is generally compatible with breastfeeding. If you are breastfeeding, it's best to check with your healthcare provider before taking chlorpheniramine.
At this time, it is not known if chlorpheniramine passes through breast milk in humans. However, various sources suggest that the medication (along with other similar antihistamines) is probably compatible with breastfeeding.
Theoretically, chlorpheniramine could affect a woman's milk supply, since the medication can suppress prolactin (a hormone important for breast milk production). However, this is probably not an issue for women who are well-established with breastfeeding.
If your healthcare provider decides that it is okay for you to take chlorpheniramine while breastfeeding, be sure to watch for any changes or side effects in your child.
You should talk with your healthcare provider about breastfeeding and chlorpheniramine. Each woman's situation is different, and you and your healthcare provider understand your situation best. After considering what you want and expect, as well as your current health situation, the two of you can make a shared decision that is right for you.