Hi priya
Desloratadine, a major active metabolite of loratadine, is a long-acting tricyclic antihistamine with selective peripheral histamine H1 receptor antagonistic activity. Desloratadine is secreted in breast milk.
I would recommend to consult your Doctor to clarify the risk and benefits as these drugs are considered in 'probably safe in usual doses'.
Thanks.
Dr subandhu Gupta