My dd was 6 when we first did the eastern cruise. I also was worried about sea sickness. I asked her pediatrician, and he said to give her Bonine - but only 1/2 the tablet. We gave it to her the pm before we boarded, the am we boarded and every am after that (along with her vitamin) - worked like a charm. I just cut the pill in half and tossed the crumbled part out. She will be 8 when we go again, but I think she will still get only 1/2 the dose.