Meclizine dihydrochloride (NSC28728) is a histamine H1 antagonist used in the treatment of motion sickness, vertigo, and nausea during pregnancy and radiation sickness.

HepG2 cells are cultured in 24-well dishes with DMEM supplemented with 10% charcoal-stripped calf serum. Cells are transfected using calcium phosphate with 100 ng of receptor expression vectors, 300 ng of luciferase reporter plasmids, and 100 ng of pSV2-β-galactosidase as internal control of transfection efficiency. Drugs are added 12 h after transfection, and cells are incubated for an additional 24 h. The cell lysate is assayed for luciferase activity and normalized to β-galactosidase activity.(Only for Reference)