
The makers of Clarinex, Shering-Plough, claim that taking this medication in the morning will relieve symptoms all the way into the next morning when one awakes. This is a benefit, since many 24-hour solutions seem to wear off while one is sleeping.

Clarinex is available in three different forms. A once-daily 5 mg tablet approved for adults and children age 12 years and older. Also available is a tablet that dissolves orally on the tongue, without the need for water. These tablets are also taken once daily and come in two sizes. A 2.5 mg tablet approved for patients 6 years and older, and a 5 mg tablet approved for patients 12 years and older.

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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