You should not take Clarinex if you are allergic to desloratadine or to loratadine (Claritin).
Before taking Clarinex, tell your doctor if you are allergic to any drugs, or if you have liver or kidney disease.
Do not give this medication to a child younger than 2 years old without the advice of a doctor.
Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.