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Allegra Brand names, Allegra Analogs

Allegra Brand Names Mixture

  • Allegra-D (Fexofenadine hydrochloride + Pseudoephedrine hydrochloride)

Allegra Chemical_Formula


Allegra RX_link

Allegra fda sheet

Allegra FDA

Allegra msds (material safety sheet)

Allegra Synthesis Reference

S. H. Kawai et al., J. Org. Chem. 59, 2620 (1994)

Allegra Molecular Weight

501.656 g/mol

Allegra Melting Point

142.5 oC

Allegra H2O Solubility

Slightly soluble

Allegra State


Allegra LogP


Allegra Dosage Forms

Oral tablets; Capsules

Allegra Indication

For management of Seasonal allergic rhinitis

Allegra Pharmacology

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, for example, swelling of tissues. Histamine is released from histamine-storing cells (mast cells) and attaches to other cells that have receptors for histamine. The attachment of the histamine to the receptors causes the cell to be "activated," releasing other chemicals which produce the effects that we associate with allergy. Fexofenadine blocks one type of receptor for histamine (the H1 receptor) and thus prevents activation of cells by histamine. Unlike most other antihistamines, Fexofenadine does not enter the brain from the blood and, therefore, does not cause drowsiness. Fexofenadine lacks the cardiotoxic potential, since it does not block the potassium channel involved in repolarization of cardiac cells.

Allegra Absorption


Allegra side effects and Toxicity

Side effects include dizziness, drowsiness, and dry mouth.

Allegra Patient Information

Patients taking ALLEGRA tablets should receive the following information:

ALLEGRA tablets are prescribed for the relief of symptoms of seasonal allergic rhinitis or for the relief of symptoms of chronic idiopathic urticaria (hives). Patients should be instructed to take ALLEGRA only as prescribed. Do not exceed the recommended dose. If any untoward effects occur while taking ALLEGRA, discontinue use and consult the doctor.

The product should not be used by patients who are hypersensitive to it or to any of its ingredients.

Patients should be told that this product should be used in pregnancy or lactation only if the potential benefit justifies the potential risk to the fetus or nursing infant.

Patients should be advised to take the tablet with water. Patients should also be advised to store the medication in a tightly closed container in a cool, dry place, away from children.

Allegra Organisms Affected

Humans and other mammals