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Mechanism of action of sedating antihistamines Free mobile cam girls no log in

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systemic, topical or inhaled drugs that antagonize histamine and control allergies, e.g.

hayfever (seasonal rhinitis), drug allergies, urticaria (induced by insect bites); injected antihistamine (chlorphenamine) is used as an adjunct to adrenaline in the treatment of anaphylaxis and angioedema; modern antihistamines (e.g.

The second-generation antihistamines bind only to peripheral HThe first-generation antihistamines may be divided into several chemical classes.

The side effect profile, which also determines the uses of the drugs, will vary by chemical class.

Promethazine (Phenergan), in contrast, is a phenothiazine, chemically related to the major tranquilizers, and while it is used for treatment of allergies, may also be used as a sedative, the relieve anxiety prior to surgery, as an anti-nauseant, and for control of motion sickness.

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.

Certain H1 antagonists, such as promethazine, have a local anesthetic effect.

acrivastine, cetirizine) tend not to cause sedation, such as loratadine (Claritin), which recently moved from prescription-only to OTC status, desloratadine (Clarinex), cetirizine (Zyrtec) and fexofenadine (Allegra), were developed to minimize the adverse events observed with the earlier agents while maintaining efficacy.

Antihistamines are inhibitors of histamine receptors. H1-antihistamines, inhibit competitively H1 receptors and the corresponding effects i. They do not inhibit antigen/antibodies reactions, nor histamine release, they inhibit H1 effects.