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No Prescription
Allegra 120 is prescribed to relieve the symptoms of hayfever.
Allegra 120 tablets contain the active ingredient fexofenadine, which is a type of drug called a non-sedating antihistamine. It works by preventing the actions of histamine.
Allegra is called a non-sedating antihistamine as it does not enter the brain in significant amounts and is therefore unlikely to cause drowsiness. However, people react differently to drugs and extremely rarely some people may experience some drowsiness.
Allegra is prescribed for the treatment of hayfever.
Allegra relieves the itchy, runny nose, sneezing, and itchy, red, watery eyes that come with hay fever. It is prescribed to relieve the itching and welts of hives. Allegra is a type of antihistamine that rarely causes drowsiness.
Allegra works by blocking histamine H1 receptors. It does not prevent the actual release of histamine from mast cells, but prevents it binding to its receptors. This in turn prevents the release of other allergy chemicals and increased blood supply to the area, and provides relief from the typical symptoms of allergies.
All this results in the symptoms of an allergic reaction. In hayfever, histamine causes inflammation of the nose, eyes, skin or airways and results in itchy watery eyes, a runny nose, sneezing and nasal congestion.
Histamine is a substance produced by the body as part of its defence mechanisms. It is stored in cells called mast cells, in almost all tissues of the body. When the body reacts to a foreign substance, eg flower pollen, the mast cells stimulated by the allergen release their stores of histamine.
In addition to the antihistamine in Allegra, Allegra-D contains the nasal decongestant pseudoephedrine.
The released histamine then binds to its receptors, causing a chain reaction that results in allergic symptoms. It causes an increase in blood flow to the area of the allergy, and the release of other chemicals that add to the allergic response.
Side Effects
Allegra side effects that you should report to your health care professional or doctor as soon as possible:
- Dizziness;
- Drowsiness;
- Fatigue;
- Headache;
- Nausea;
Allegra:
- Pain including back or ear pain;
- Nausea;
- Menstrual problems;
- Indigestion;
- Headache;
- Fever;
- Fatigue;
- Drowsiness;
- Coughing;
- Colds or flu;
Allegra-D:
- Throat irritation;
- Respiratory tract infection;
- Nervousness;
- Nausea;
- Insomnia;
- Indigestion;
- Heart palpitations;
- Headache;
- Dry mouth;
- Dizziness;
- Back pain;
- Anxiety;
- Agitation;
- Abdominal pain;
Dosage
Allegra
Adults and Children 12 Years and Older
For hay fever, the usual dosage is 60 mg twice a day or 180 mg once a day.
If you have kidney problems, your doctor may have you take only one 60-mg dose daily.
For hives, it's 60 mg twice a day.
Children 6 through 11 years old
Children with kidney problems may be prescribed only one 30-mg dose each day.
For hay fever or hives, the usual dosage is 30 mg twice a day.
Allegra-D
Adults and Children 12 Years and Older
Allegra is not recommended for children less than 12 years old.
24-Hour Tablets: Take 1 tablet once a day. Allegra-D 24-hour tablets should generally not be taken by people with kidney problems.
12-Hour Tablets: Take 1 tablet twice a day. People with kidney problems should take only 1 tablet daily.
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