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Allegra used: This medicine is an antihistamine used to relieve symptoms of seasonal allergies such as runny or itchy nose; sneezing; itchy throat; and watery, itchy, or red eyes. It may also be used to treat other conditions as determined by your doctor Generic Allegra (Fexofenadine) is used to prevent sneezing, runny nose, itching and watering of the eyes, and other allergic symptoms.
Allegra prescription: Fexofenadine is used for the treatment of seasonal allergies and chronic urticaria (hives) in adults and children 6 years of age or older. Fexofenadine is an oral, 'second generation' antihistamine that is used to treat the signs and symptoms of allergy that are due to histamine. It is similar to the other second generation antihistamines loratadine (Claritin), cetirizine (Zyrtec) and azelastine (Astelin). Histamine is a chemical that is responsible for many of the signs and symptoms of allergic reactions, for example, swelling of the lining of the nose, sneezing, and itchy eyes. Histamine is released from histamine-storing cells (mast cells) and then 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 that produce the effects that we associate with allergy, e.g., sneezing. Fexofenadine blocks one type of receptor for histamine (the H1 receptor) and thus prevents activation of H1 receptor-containing cells by histamine. Unlike the first generation antihistamines, fexofenadine and other second-generation antihistamines do not readily enter the brain from the blood, and, therefore, they cause less drowsiness.
Allegra use: Fexofenadine is an oral, "second generation" antihistamine that is used to treat the signs and symptoms of allergy that are due to histamine. It is similar to the other second generation antihistamines loratadine (Claritin), cetirizine (Zyrtec) and azelastine (Astelin). Histamine is a chemical that is responsible for many of the signs and symptoms of allergic reactions, for example, swelling of the lining of the nose, sneezing, and itchy eyes. Fexofenadine is used for the treatment of seasonal allergies and chronic urticaria (hives) in adults and children 6 years of age or older.
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Why is this drug prescribed?
Allegra 120mg 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.
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.
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.
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.
Fexofenadine 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.
Fexofenadine 120mg is used to relieve the symptoms of hayfever.
Fexofenadine 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.
Treatments
* Hayfever
What side effects can this drug cause?
* Headache
* Nausea
* Dizziness
* Fatigue
* Drowsiness |
