The lovely Mrs. Jones (Vita) would never sail without Bonine. She takes one every morning, whether whe needs it or not, and has NEVER had a problem,,,,even in very rough seas. She is extremely sensitive to motion sickness, so if it works for her,,,it works.
P.S. Bonine is "Meclizine", and can be purchased over the counter, if you buy a full bottle (100). If you sail a lot, or are in need of a lot of this medication, it's worth it to buy a bottle. (Price isn't much different than two blister packages of Bonine.)