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Hydroxyzine pamoate

Hydroxyzine (Hydroxyzine)
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Structural Formula
Russian name
Latin name for the substance Hydroxysine
Hydroxyzinum (born Hydroxyzini)
Chemical name
2-[2-[4-[(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethanol]ethanol (as dihydrochloride or embonate).

Description of the substance Hydroxyzine, instructions, application, contraindications and formula.
Gross Formula .
Pharmacological group of substance Hydroxysine
Nosological Classification (ICD-10)
CAS code
Characteristics of the substance Hydroxysine
Hydroxysine hydrochloride - white powder, odorless, very well soluble in water, molecular weight 447.83.

Pharmacological action - anxiolytic, H1-antihistamine.

Hydroxysine blocks H1-histamine receptors, has anti-muscarinic and sedative effect, contributes to the suppression of some subcortical zones.

In addition to H1-histaminoblocking, has a bronchodilating and anti-emetic effect, has a moderate inhibitory effect on gastric secretion. Hydroxysin significantly reduces itching in patients with hives, eczema and dermatitis.

Improves cognitive functions, including attention and memory. Does not cause addiction, mental dependence and withdrawal syndrome with prolonged use.

In liver failure H1-histaminoblocking effect can be prolonged up to 96 hours after a single use.

Possesses moderate anxiolytic activity.

PDescription of the substance Hydroxyzine, instructions, application, contraindications and formula.olysomnography in patients with insomnia and anxiety demonstrates prolonged sleep duration, reduced frequency of night awakenings after a single or repeated use of hydroxysine in a dose of 50 mg. Decrease in muscle tension in patients with anxiety was noted when taken in a dose of 50 mg 3 times a day.

H1-histaminoblocking effect occurs approximately 1 h after ingestion. The sedative effect appears 30-45 min. later.

Pharmacokinetics .
Suction. After ingestion the absorption is high, the Tmax value is 2 hours. After taking an average dose of 50 mg Cmax in adults - 70 ng / ml.

After ingestion of a single dose of 50 mg Cmax is 65 ng/ml.

Distribution. Hydroxysine is more concentrated in tissues than in plasma. The Vd value is 7-16 l/kg in adults. Hydroxysine Therapeutic indications penetrates the GHB and placenta, concentrating more in the fetal than in the maternal tissues.

Hydroxysin penetrates well into the skin, with concentrations of hydroxysin in the skin much higher than those in serum, both after single and repeated use. Plasma concentrations of hydroxysin do not necessarily reflect its binding to tissues or its distribution in the skin.

Metabolism. Hydroxysine is metabolized in the liver. Cetyrizine, the main metabolite (45%), is a blocker of H1-histamine receptors. Metabolites are found in breast milk.

excretion. T1/2 in adults - 14 h (range - 7-20 h). The total clearance of hydroxysine is 13 ml/min/kg. About 0.8% of hydroxysine is excreted unchanged through the kidneys. Cethrysine is excreted mainly in the urine, also in its unchanged form (25% of the hydroxysine dose taken orally or 16% of the hydroxysine dose).