Hydroxyzine (Hydroxyzine Hydrochloride) - Description and Clinical Pharmacology

DESCRIPTION

HydrOXYzine hydrochloride has the chemical name of 2-[2-[4-(p-Chloro-α-phenylbenzyl)-1-piperazinyl]ethoxy]ethanol dihydrochloride.

C₂₁H₂₇ClN₂O₂•2HCl M.W.447.83

C₂₁H₂₇ClN₂O₂•2HCl M.W.447.83

HydrOXYzine hydrochloride occurs as a white, odorless powder which is very soluble in water.

Each tablet for oral administration contains 10 mg, 25 mg or 50 mg hydrOXYzine HCI. Inactive ingredients include: lactose monohydrate, colloidal silicon dioxide, hypromellose, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, stearic acid, polyethylene glycol, polysorbate 80, and titanium dioxide.

CLINICAL PHARMACOLOGY

HydrOXYzine hydrochloride is unrelated chemically to the phenothiazines, reserpine, meprobamate or the benzodiazepines. HydrOXYzine 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 hydrOXYzine's clinical effects are usually noted within 15 to 30 minutes after oral administration.