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Hydoxyzine (Hydroxyzine Pamoate) - Description and Clinical Pharmacology

 
 



 

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DESCRIPTION

Hydroxyzine pamoate is a light yellow, practically odorless powder practically insoluble in water and methanol and freely soluble in dimethylformamide. It is chemically designated as (±)-2-[2-[4-(p -Chloro-α-phenylbenzyl)-1-piperazinyl]ethoxy]ethanol 4,4’-methylenebis[3-hydroxy-2-naphthoate] (1:1) [10246-75-0] and can be structurally represented as follows:

C21H27CIN2O2•C23H16O6

M.W. 763.27

Each capsule, for oral administration, contains hydroxyzine pamoate equivalent to hydroxyzine hydrochloride 25 mg or 50 mg. In addition, each capsule contains the following inactive ingredients: colloidal silicon dioxide, D&C yellow No. 10, FD&C blue No. 1, FD&C blue No. 2, FD&C green No. 3, FD&C red No. 40, FD&C yellow No. 6, gelatin, hydroxypropyl cellulose, lactose monohydrate, magnesium stearate, propylene glycol, sodium lauryl sulfate, sodium starch glycolate and titanium dioxide.

CLINICAL PHARMACOLOGY

Hydroxyzine pamoate is unrelated chemically to the phenothiazines, reserpine, meprobamate or the benzodiazepines.

Hydroxyzine pamoate is not a cortical depressant, but its action may be due to a suppression of activity in certain key regions of the subcortical area of the central nervous system. Primary skeletal muscle relaxation has been demonstrated experimentally. Bronchodilator activity and antihistaminic and analgesic effects have been demonstrated experimentally and confirmed clinically.

An antiemetic effect, both by the apomorphine test and the veriloid test, has been demonstrated. Pharmacological and clinical studies indicate that hydroxyzine in therapeutic dosage does not increase gastric secretion or acidity and in most cases has mild antisecretory activity.

Hydroxyzine is rapidly absorbed from the gastrointestinal tract and its clinical effects are usually noted within 15 to 30 minutes after oral administration.

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