Allegra D 24 hour is a prescription only drug indicated for the treatment of seasonal allergy symptoms. It can treat allergy symptoms like itching in eyes, sneezing, watery eyes and congestion of nose. It is effective in treating allergic rhinitis developed among adults. This drug might be indicated to children above 12 years of age. This drug is also helpful to treat the patients who require antihistaminic properties of fexofenadine hydrochloride. Along with, it is effective where pseudoephedrine hydrochloride (to clear congestion) is needed. 

This drug comprises of both antihistamine and decongestant. This drug's Fexofenadine hydrochloride content has the H1-receptor antagonist capacity. It releases histamine without any alpha1-adrenergic-receptor blocking. Along with, it is a sympathomimetic amine. Due to this, it can exert decongestant action on mucosa of nasal cavity. Pseudoephedrine hydrochloride is capable of producing peripheral effects like ephedrine.
Along with, its effects are less intense compared to amphetamines. As a result, the chance of side effects is lower compared to other drugs for allergic rhinitis. Doctors also prescribe Allegra D 24 hour for several off-label purposes. However, none of these purposes enjoys universal acceptance. Hence, consulting with your doctor is a must while using Allegra D 24 hour for any off-label purpose.

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