The Allegra D12 hr which is basically fexofenadine hydrochloride & pseudoephedrine hydrochloride and should be consumed orally. It can give a fast relief from allergic rhinitis without even giving the feeling of drowsiness. It contains about 60 mg of fexofenadine hydrochloride as immediate release consumption and 120mg of pseudoephedrine hydrochloride in the extended release form.
It is a histamine H1-receptor antagonist. Its chemical name is (±)-4-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-butyl]-α, α-dimethyl benzeneacetic acid hydrochloride. This medicine has a molecular of: 538.13 and its empirical formula comes as: C32H39NO4•HCl. In the market, it is available in the form of fine, white colored powder or crystals. It has a faint odor and is absolutely water soluble, alcohol soluble and sparingly soluble when it comes to chloroform.
The Allegra D 12hr works quite fast to give relief from the symptoms like stuffy nose, red, itchy and watery eyes and sneezes. However, it should always be taken under the recommendation of a medical professional. However, it is suggested only for patients above 12 years and older. It should be taken twice a day to get immediate results. The medicine should be taken by mouth on a completely empty stomach at least 1 hour before the meal. The tablet should be swallowed as a whole without crushing or chewing it.

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