before the dose , then hourly for 6 hours , every 2 hours from 6-12 hours , at 24 hours , and every 24 hours for 6 days , serum hydroxyzine and cetirizine were measured and an intradermal injection of 0.01 ml of a 0.1 mg/ml solution of histamine phosphate was performed .
C0020404
hydroxyzine
C0055147
cetirizine