Sedating anti histamine

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The physiological mechanism of allergic reactions is the same, however, in everyone.During an allergic reaction, mast cells release histamine and other substances.Mast cell stabilizers, such as cromolyn sodium, keep these cells intact.Newer antihistamines are said to be non-sedating, although some users may experience drowsiness even from these.All antihistamines work in the same way: by competing with histamine to prevent or reduce the characteristic signs and symptoms of an allergic reaction: swelling, tearing, itching, and increase in bronchial and other secretions.Leukotriene inhibitors: Other substances released during an allergic reaction are leukotrienes, which can aggravate allergic conditions and asthma.Some drugs target leukotriene receptors to reduce allergic symptoms.Nasal decongestants may cause a temporary burning, stinging, or dryness in the nose, a runny nose, and sneezing.Oral decongestants may cause dizziness, headache, nervousness, fast heartbeat, increased blood pressure, loss of appetite, and sleep problems.They don't relieve other allergy symptoms such as itching and sneezing.Immunomodulators: These are topical medications used to treat skin allergies.

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