I get seasick a lot which is a real drag since I'm an avid scubadiver. The thing that has worked the best for me has been scopolamine patches. It's a prescription med in the form of a quarter-sized adhesive patch that you put behind your ear the nite before you need it. It's solved my problem almost completely. They're supposed to be good for a couple days, but I find that they tend to fall off after a hot shower, so I end up using one a day.