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.
Pharmacodynamics. Fexofenadine is a second-generation, long lasting H1-receptor antagonist (antihistamine) which has a selective and peripheral H1-antagonist action. Histamine is a chemical that causes many of the signs that are part of allergic reactions, such as the swelling of tissues.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.