The real trick with seasick remedies is you have to take them BEFORE you need them. They have to be in your system at least 24 hours ahead of when you might be affected, which you will not know. Some trips can be perfectly calm, others unexpectedly rough.

Alaska Inside passage does have some notorious rough patches. The Mozambique Channel between Madagascar and South Africa in Feb/March was deadly - relentless up, down, side to side "corkscrewing" for days on end. Yet we have found the Malaaca Straights from Singapore to Malaysia to be 100% like glass each time so far even at different times of the year Jan-April. Southern Caribbean in January again was almost 100% like glass. Mexican Riviera in December was very smooth.

So you have to decide if you want preventive use of these product because they will not help much after the fact.

The best combo I have found is starting Bonine and crystallized ginger chunks a day before and then a Bonine at night and munch on ginger chunks throughout the day. It is the most benign combo for me, though there is some daytime drowsiness the first few days. That is why I take it at night when drowsiness can be welcome.

Be sure Bonine, even though it is OTC is okay for you to take. Try some out before you go to see what side effects you might feel. I wear contact lenses and worried about dry eyes but this was not a problem. Even ginger can cause some stomach upsets. I don't like the capsules myself but find I like the crystallized ginger chunks even in their own right.

If my baggage and weight allowance allows it, I also pack along some bottles of the very wonderful Australian Bundaberg brand ginger beer. Ginger ale is worthless, but occasionally in some parts of the world ship will carry Schwepes Ginger Beer which is also quite good.