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Promethazinecodeine, Phenergan with Codeine Drug Facts and


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2/17/2014
02:28 | Author: Alex Watson

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Promethazinecodeine, Phenergan with Codeine Drug Facts and

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Cells in the body release histamine during several types of allergic reactions. When histamine binds to its receptors on other cells, it stimulates changes within the cells that lead to release of other chemicals that cause sneezing, itching, and increased mucus production. Antihistamines such as promethazine compete with histamine for one of the receptors for histamine (the H1 receptor) on cells; however, when antihistamines bind to the receptors they do not stimulate the cells. Instead, they prevent histamine from binding and stimulating the cells. Promethazine also blocks the action of acetylcholine, a neurotransmitter that nerves use to communicate with one another, on its receptors (anticholinergic effect), and this may explain its benefit in reducing the nausea of motion sickness. It is used as a sedative because it causes drowsiness as a side effect. The cough suppressant effects may be due to is anticholinergic effects.

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GENERIC NAME: promethazine and codeine BRAND NAME: (Phenergan with Codeine: This brand no longer is available in the U.S.) DRUG CLASS AND MECHANISM: Promethazine is in a class of drugs called phenothiazines which also includes chlorpromazine (Thorazine) and trifluoperazine (Sazine); however, unlike the other drugs in this class, promethazine is not used as an anti-psychotic but rather as an anti-histamine, sedative, antiemetic (anti-nausea), and cough suppressant.

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