I am an unrepentant spewer. Scopolamine is the drug of choice. In the US, it is most commonly available via prescription only (Scop-Transderm patches) which are unreasonably expensive. For reasons I can't explain, in the US, Scopolamine could be sold OTC as an oral tablet, but the drug companies have elected not to do so.
Ebay and the UK to the rescue: http://www.ebay.com/itm/Kwells-Trav...630205?hash=item33a364e3bd:g:tF4AAOSweW5VEpz3
Because one can make drugs of the pills. Actually, they can make drugs from the patches, but it is harder, so the companies limit how many you can have.