subcutaneous injection of scopolamine ( 100 mg/kg ) , chlorpromazine ( 8 mg/kg ) , promethazine ( 50 mg/kg ) , diphenhydramine ( 20 mg/kg ) , chlorphenylamine ( 20 mg/kg ) and methamphetamine ( 2 mg/kg ) decreased the emetic effect of motion sickness , but pyrilamine ( 20 mg/kg ) , meclizine ( 20 mg/kg ) and dimenhydrinate ( 32 mg/kg ) were not effective or very weak .
C0012522
diphenhydramine
C0012381
dimenhydrinate