I would try out anything you buy before you go to see if it has any unwanted side efects. All week long on our cruise, DH complained of being tired. He wanted to sleep a lot, didn't pay attention to people speaking to him and was very irritable. We couldn't figure out what was wrong with him. I was ready to send him to the doctor as soon as we got home. The last formal night we planned to go dancing. On our first dance, he started stumbling and forgetting how to do basic dance steps. He commented that he almost felt as if he had been drugged. Light bulb goes on! The Bromine was giving him all these side effects. Once we realized the problem and it got out of his system, he was fine. We didn't get seasick though! Enjoy your cruise!