Clemastine and Breastfeeding
In clinical studies on breastfeeding and clemastine, the medication was shown to pass through breast milk. Some sources warn against using this drug while breastfeeding, while others consider small and occasional doses of clemastine to be compatible with breastfeeding. Before taking clemastine, nursing women should talk to their healthcare providers about any potential risks.
Clemastine fumarate (Tavist® Allergy, Dayhist® Allergy) is an antihistamine medication that passes through breast milk. Therefore, if you are breastfeeding, talk with your healthcare provider before taking clemastine.
Research has shown that clemastine passes through breast milk. The prescribing information for the prescription version of clemastine states that breastfeeding women should never take the medication, since newborns and premature infants are especially sensitive to the medication. However, other sources consider small, occasional doses of clemastine to be compatible with breastfeeding.
Theoretically, it is possible that clemastine 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 clemastine while breastfeeding, be sure to watch for any changes or side effects (such as unusual drowsiness or irritability) in your breastfed child.
You should talk with your healthcare provider about taking clemastine while nursing. 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 about breastfeeding and clemastine that is right for you.