Allegra is one of the most commonly prescribed medications for seasonal allergies, and is also used to help treat other types of allergies. Its chemical name is fexofenadine, and it is an antihistamine. This medication, like a number of other modern allergy drugs, does not easily psss through the blood-brain barrier, which is important since that makes it less likely to have extreme drowsiness as a side effect. Allegra was developed in 1993, approved by the FDA in 1996, and from 1996 to 2004 it had over $1.8 billion in global sales.
Instead of working as a therapeutic medication, this drug works to prevent the effects of allergies. This means that the medication is not a cure, but makes the symptoms much less noticeable. The typical symptoms that see an improvement with this drug are itchy eyes, runny nose, fatigue, and repetitive sneezing. These changes are achieved because Allegra helps to antagonize the H1 receptor.
The typical dosage that an individual will use depends primarily on their age. Children in an age range from two to eleven years will usually take 30 mg twice each day. Elderly people are advised to start with 60 mg once a day and then increase their dosage if it's needed. Adults and children older than eleven usually take 60 mg twice a day, or 180 mg once a day.
Allegra is usually prescribed in 30 mg tablets, 60 mg tablets, 180 mg tables, or 30 mg chewables. A lot of tablets are combined with pseudoephedrine, a decongestant, in 120 mg or 240 mg doses. The pseudoephedrine compliments the effects of the fexofenadine, and help to get fluid off of a person's chest.
While it works well for allergies for most people, there are a number of side effects. The most common side effects of this medication are similar for other allergy medications, and include nausea, dizziness, and drowsiness. Other more severe side effects that are less common include vomiting, diarrhea, and atypical bowel movements. Some people will also experience mild headaches, fever, fatigue or general weakness, and dry mouth.
Allegra's predecessors were primarily made with a chemical known as terfenadine.
Unlike fexofenadine, terfenadine had much more serious side effects, and as a result is very rarely prescribed anymore. Terfenadine-based antihistamines are generally referred to as first-generation antihistamines, while fexofenadine-based antihistamines are considered a second-generation or third-generation drug.
It's well known that Allegra should not be taken with fruit juices. The chemicals in fruit juices can interfere with how the body absorbs the medication, resulting in the equivalent of taking less of the drug in the first place.
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