Tell your doctor about all your other medicines, especially:
a cold or allergy medicine;
cimetidine;
fluoxetine (Prozac);
ketoconazole; or
an antibiotic--azithromycin (Z-Pak) or erythromycin.
This list is not complete. Other drugs may affect desloratadine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Desloratadine drug interactions (more detail)
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