People who eat five servings of fruits and vegetables every day live longer than people who don't. But even if you'd rather have a slice of apple pie than an apple, you can make healthier choices, at least avoiding the foods you know absolutely aren't good for you [source: Paddock]. NEXT.
Fexofenadine is the active metabolite of terfenadine. It is a selective histamine H 1 receptor antagonist that does not cross the blood brain barrier; therefore, it is not associated with sedation or adverse cognitive effects. Unlike older antihistamines, fexofenadine does not have anticholinergic activity.here have been no comparative trials with fexofenadine and the intranasal nonsedating antihistamines (azelastine and levocabastine) in patients with seasonal allergic rhinitis. As with other oral nonsedating antihistamines, fexofenadine has little effect on nasal congestion.
It was developed as a successor of and alternative to terfenadine. Fexofenadine, like other second and third-generation antihistamines, does not readily pass through the blood-brain barrier, and so causes less drowsiness than first-generation histamine-receptor antagonists.echanism of action. Like other H1-blockers, Fexofenadine competes with free histamine for binding at H1-receptors in the GI tract, large blood vessels, and bronchial smooth muscle. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms (eg.