As the others have noted, here in the U.S. you can buy Bonine over the counter, in bubble packs. I was told at my drug store that I could buy Meclizine 25's without a RX as long as I bought a whole bottle (100). That's the way I buy it, but the lovely Mrs Jones (Vita) takes one every day when we sail, and we cruise a lot. The price for 100 isn't much more than the bubble pack for 10 or so!
Bonine (mechlazine) works great, and has very few side effects.
See you aboard,