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Nasonex nasal spray contains the active ingredient mometasone furoate, which is a type of medicine known as a corticosteroid.

Corticosteroid medicines are derivatives of corticosteroid hormones that are produced naturally by the adrenal glands. They are often simply called steroids, but it should be noted that they are very different from another group of steroids, called anabolic steroids, which have gained notoriety because of their abuse by some athletes and body builders.

Corticosteroids have many important functions in the body, including control of inflammatory responses. Corticosteroid medicines are mainly used for their effect in controlling inflammation, and corticosteroid nasal sprays are used for the localised treatment of nasal allergies.

Inflammation often occurs as a result of an allergic reaction, and people who suffer from nasal allergies (allergic rhinitis), such as hayfever, or dust mite or pet allergies, tend to experience a variety of symptoms due to this inflammation. Inflammation of the nasal passage forces fluid out of the nasal tissues, resulting in a runny and blocked nose. Other symptoms include sneezing, and watery, itchy eyes.

Mometasone works by stopping the cells in the nasal lining from producing various inflammation-causing chemicals that are normally released when the body reacts to allergens or irritation. These include prostaglandins and various other inflammatory substances. By preventing these inflammatory chemicals from being released in the nose, mometasone reduces the inflammation and relieves its related symptoms.

The nasal spray delivers mometasone directly to the area where it is needed, which reduces the chance of side effects occurring elsewhere in the body.

Mometasone nasal spray treats the symptoms of nasal allergies, such as hay fever, pet allergy or dust mite allergy. It can also be used to prevent hay fever in people who suffer severely from this type of allergy. Treatment should be started four weeks prior to the pollen season for this purpose.

Some people may experience some relief from their hay fever symptoms within 12 hours of the first dose. However, it is important to keep using the medicine regularly, as prescribed by your doctor, to achieve the full benefit.

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