Allegra-D 12 Hour Information

What's inside Allegra-D 12 Hour

Allegra-D 12 Hour Chemical Information

fexofenadine hydrochloride - The hydrochloride salt form of fexofenadine, a carboxylated metabolic derivative of terfenadine and third generation selective histamine H1-receptor antagonist with antihistaminic and non-sedative effects. Fexofenadine competitively binds peripheral H1-receptors, thereby stabilizing an inactive conformation of the receptor. Consequently histamine binding and activity as a result of mast-cell degranulation followed by the release of multiple inflammatory mediators, such as interleukins, prostaglandin and leukotriene precursors, is blocked, thereby preventing the triggering of pro-inflammatory pathways.

pseudoephedrine hydrochloride - The hydrochloride salt form of pseudoephedrine, a phenethylamine and an diastereomer of ephedrine with sympathomimetic property. Pseudoephedrine hydrochloride displaces norepinephrine from storage vesicles in presynaptic neurones, thereby releasing norepinephrine into the neuronal synapses where it stimulates primarily alpha-adrenergic receptors. It also has weak direct agonist activity at alpha- and beta- adrenergic receptors. Receptor stimulation results in vasoconstriction and decreases nasal and sinus congestion.