Allegra-D 24 Hour (Fexofenadine HCl 180 and Pseudoephendrine HCl 240) Drug Information: Description, User Reviews, Drug Side Effects, Interactions

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February 9, 2012

Allegra-D 24 Hour

Allergy »

Allergy facts

Allergy involves an exaggerated response of the immune system.
The immune system is the body's organized defense mechanism against foreign invaders, particularly infections.
Allergens are substances that are foreign to the body and can cause an allergic reaction.
IgE is the allergy antibody.
Allergies can develop at any age.
Your risk of developing allergies is related to your parents' allergy history.

Introduction

In this review you will learn how allergy relates to the immune system. You will begin understanding how and why certain people become allergic. The most common allergic diseases are discussed briefly in this article.

What does an allergy mean?

An allergy refers to an exaggerated reaction by our immune system in response to bodily contact with certain foreign substances. It is exaggerated because these f...

Read the Allergy article »

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Allegra-D 24 Hour

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ALLEGRA-D®24 HOUR (fexofenadine HCl 180 mg and pseudoephedrine HCl 240 mg) Extended-Release Tablets

DRUG DESCRIPTION

ALLEGRA-D® 24 HOUR (fexofenadine hydrochloride and pseudoephedrine hydrochloride) Extended-Release Tablets for oral administration contain 180 mg fexofenadine hydrochloride for immediate release and 240 mg pseudoephedrine hydrochloride for extended release. Tablets also contain as excipients: microcrystalline cellulose, sodium chloride, cellulose acetate, polyethylene glycol, opadry white, povidone, talc, hypromellose, croscarmellose sodium, copovidone, titanium dioxide, magnesium stearate, colloidal silicon dioxide, brilliant blue aluminum lake, acetone, isopropyl alcohol, methyl alcohol, methylene chloride, water, and black ink.

Fexofenadine hydrochloride, one of the active ingredients of ALLEGRA-D 24 HOUR (fexofenadine hcl 180 and pseudoephendrine hcl 240) , is a histamine H₁-receptor antagonist with the chemical name (±)-4-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-butyl]-α, α-dimethyl benzeneacetic acid hydrochloride and the following chemical structure:

Fexofenadine HCl Structural Formula Illustration

The molecular weight is 538.13 and the empirical formula is C₃₂H₃₉NO₄•HCl. Fexofenadine hydrochloride is a white to off-white crystalline powder. It is freely soluble in methanol and ethanol, slightly soluble in chloroform and water, and insoluble in hexane. Fexofenadine hydrochloride is a racemate and exists as a zwitterion in aqueous media at physiological pH.

Pseudoephedrine hydrochloride, the other active ingredient of ALLEGRA-D 24 HOUR, is an adrenergic (vasoconstrictor) agent with the chemical name [S-(R*,R*)]-α-[1-(methylamino)ethyl]-benzenemethanol hydrochloride and the following chemical structure:

Pseudoephedrine HCl Structural Formula Illustration

The molecular weight is 201.70 and the molecular formula is C₁₀H₁₅NO•HCl. Pseudoephedrine hydrochloride occurs as fine, white to off-white crystals or powder, having a faint characteristic odor. It is very soluble in water, freely soluble in alcohol, and sparingly soluble in chloroform.

What are the possible side effects of fexofenadine and pseudoephedrine (Allegra -D 24 Hour, Allegra-D)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have any of these serious side effects:

fast, pounding, or uneven heartbeat;
confusion, hallucinations, unusual thoughts or behavior;
severe dizziness, anxiety, restless feeling, or nervousness;
increased blood pressure (severe...

Read All Potential Side Effects and See Pictures of Allegra-D 24 Hour »

What are the precautions when taking fexofenadine hcl 180 and pseudoephendrine hcl 240 (Allegra-D 24 Hour)?

Before taking fexofenadine with pseudoephedrine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: glaucoma (narrow angle type), severe difficulty urinating (urinary retention), severe high blood pressure, severe heart/blood vessel disease (coronary artery disease), experienced serious side effects with decongestants (irregular heart rhythm).

Before using this medication, tell your doctor or pharmacist your medical history, especially of:...

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Last reviewed on RxList: 5/10/2010
This monograph has been modified to include the generic and brand name in many instances.