It is best not to take loratadine during breastfeeding, and if you must take it, it is best to stop breastfeeding temporarily for the following reasons: 1. Loratadine is an anti-allergy drug, mainly used for systemic allergic diseases caused by various reasons, in the application of the drug, the primary principle is not to use it during breastfeeding, and not to use it systemically if you can use it locally. If it is only a mild local itch caused by allergy, or a local rash or papule, it is recommended to use topical drugs such as topical glyburide, and avoid systemic medication. 2. loratadine belongs to the class of anti-blocking amines, which can enter the baby’s body through breast milk after taking, because the baby’s blood-brain barrier is not well developed, so it may cause the baby’s headache and other uncomfortable reactions, so it is recommended to use the drug carefully. If you only take it occasionally, it is advisable to stop breastfeeding temporarily to be relatively safe.