What side effects may I notice from receiving Clarinex?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-fast heartbeat or chest pain
-fever or infection

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-dry or irritated mouth or throat
-headache
-irritable
-menstrual changes
-muscle aches
-stomach upset, nausea

This list may not describe all possible side effects for Clarinex. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.