Allegra relieves the itchy, runny nose, sneezing, and itchy, red, watery eyes that come with hay fever. Its effect begins in 1 hour and lasts 12 hours, peaking around the second or third hour. Allegra is one of the new type of antihistamines that rarely cause drowsiness. In addition, to the antihistamine in Allegra, Allegra-D also contains the nasal decongestant pseudoephedrine. Most important fact about this drug: Seldane, an antihistamine related to Allegra...
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