Pregnancy and Claritin (Loratadine). Loratadine is a pregnancy category B drug, which means it is should not cause harm to an unborn child. Regardless, you should tell your doctor if you are pregnant or plan to become pregnant before taking this or any other medication. You should also alert your physician if you are breastfeeding or plan to breastfeed. It’s not recommended that breastfeeding mothers take this medication.