Pharmacokinetics and antipruritic effects of hydroxyzine in children with atopic dermatitis.
We studied the pharmacokinetics and antipruritic effects of hydroxyzine hydrochloride in 12 children, mean age 6.1 +/- 4.6 years, with severe atopic dermatitis. After a single 0.7 mg/kg orally administered dose of the drug, the mean peak serum hydroxyzine concentration of 47.4 +/- 17.3 ng/ml occurred at a mean time of 2.0 +/- 0.9 hours. The mean elimination half-life was 7.1 +/- 2.3 hours, the mean clearance rate was 32.08 +/- 11.05 ml/min/kg, and the mean apparent volume of distribution was 18.5 +/- 8.6 L/kg. The elimination half-life increased with increasing age (r = 0.83). Pruritus was significantly suppressed from 1 to 24 hours after the administration of the dose, with greater than 85% suppression from 2 to 12 hours. The only adverse effect reported was sedation. In a subsequent double-blind, crossover, multiple-dose study of 2 weeks' duration, hydroxyzine 0.7 mg/kg three times daily was as effective as hydroxyzine 1.4 mg/kg three times daily in relieving pruritus and promoting resolution of the skin lesions. The 0.7 mg/kg tid dose caused significantly less sedation than the 1.4 mg/kg tid dose.
D000982:Antipruritics / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D002986:Clinical Trials as Topic; D003876:Dermatitis, Atopic / Q000188:drug therapy*; D003879:Dermatologic Agents / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006207:Half-Life; D006801:Humans; D006919:Hydroxyzine / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use*; D007700:Kinetics; D008297:Male; D008657:Metabolic Clearance Rate; D011897:Random Allocation; D013997:Time Factors
D000982:Antipruritics; D003879:Dermatologic Agents; D006919:Hydroxyzine