Claritin (loratadine is excreted in clinically unimportant amounts.
Anderson, PO.  Drug use during breast-feeding.  Clin Pharm.
1991:10: p 604
The article cited is:
Hilbert J, Radwanski E, Affrime MB et al.  Excretion of loratadine in
human breast milk.  J Clin Pharmacol.  1988:28:234-9