Talk to your doctor or pharmacist about the best dose to use for this purpose, since I think the box label only discusses its use for allergies and leaves wiggle room on dosing (1 or 2
pills, and a range of how frequently to take it, up to so many
pills per day); a doctor or pharmacist can probably give you a much better idea of how it is typically dosed for anti-emetic purposes. Dramamine is also an antihistamine I believe, but is marketed for nausea (specific to motion-sickness, I believe).