I use the $10 "Seabands" you can acquire at any drug store or Walmart. I carry them on my boat, have used them for years deep sea fishing in the Atlantic and halibut fishing in AK... I have never seen anyone get sick wearing these. They say you can even put them on after the the "sickness" kicks sets in to squelch an on coming bought but we never take any chances on big water, I just put them on. They are terry cloth bands that apply acupuncture to a point on your wrist... no medicine, no drowsiness. I have been on many ocean trips were more than half the boat is sick but not us :-)