
Clarinex is a medication which can be taken year-round by those who suffer from allergies. It is also effective at treating those who suffer from hives or rashes. The active ingredient in this medication is desloratadine, which is an antihistamine. This blocks the immune system's production of the natural chemical histamine, which is produced when the body becomes sensitive to something.

Avoid using other medicines that make you sleepy (such as sleeping pills, pain medication, muscle relaxers, and medicine for seizures, depression or anxiety). They can add to sleepiness caused by desloratadine and pseudoephedrine.

Clarinex helps relieve seasonal and indoor allergy symptoms, as well as chronic hives and itching. It works by blocking histamine -- a chemical in the body that causes sneezing, itching, and irritation when you come into contact with something you're allergic to. Clarinex does not, however, help clear nasal passages. Common side effects, while rare, include nausea, sore throat, and dry mouth.

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