mean peak hydroxyzine levels of 116.5 +/- 60.6 ng/ml occurred at 2.3 +/- 0.7 hours and mean peak cetirizine levels of 500.4 +/- 302.0 ng/ml occurred at 4.8 +/- 2.8 hours .
C0020404
hydroxyzine
C0055147
cetirizine