Difference between sedating and non sedating antihistamines

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(A second type of antihistamine is used primarily for suppressing acid production in the stomach and treating acid-related diseases such as ulcers of the stomach.

These antihistamines will not be discussed further.) Antihistamines also may be used to treat motion sickness, insomnia (difficulty sleeping), and anxiety.

The first-genaration antihistamines have alpha adrenolytic activity which can decrease the vasoconstrictive effect of adrenaline and noradrenaline and an antimuscarinic effect with the corresponding adverse effects.Therefore, this article will only discuss the newer antihistamines, as described below.Newer antihistamines, called second-generation antihistamines include: It's important to note that montelukast (Singulair), is not an antihistamine, but rather an antileukotriene medication.There are two kinds of histamine receptors, H1 and H2.These receptors both receive histamine as a messenger, but the meaning conveyed is different.

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