Speaking from my experience ... I'm not getting seasick often, and I've never taken any medication, BUT if I'm getting dizzy, I'm just drinking Ginger Ale. I have supply of Schweppes Ginger Ale in smaller 10 oz. bottles with caps.
http://www.amazon.com/gp/product/B00061EV6W/ref=nosim/102-1139946-1650543?n=3370831
Much easier to keep it fresh and carbonated. You can get it from any supermarket, but Longs Drugs sells it for $2.79 (I believe) per six pack, Ralphs $5.99. Canada Dry or any other will work as well.
One bottle works for me and most of my passengers, but takes about an hour to take effect. Gentle, Healthy (relatively ;-) and pleasant approach.
Dramamine works fine, but is DROWSY - good for passengers, but not captain.
Scopace should be an ULTIMATE solution, Costco pharmacy has it, BUT by prescription only.