It is available free on board (from guest services or the medical center).
Note that the packets they had when we were on the Fantasy contained aspartame as an ingredient. The tablets are chewable, thus "sweetened".
I purchase
Dramamine Less Drowsy which contains meclizine as the active ingredient. I used to get it at
Walmart, but at the nearest one to us it is not on the shelves anymore (last several months). I therefore order it from drugstore.com . Each Dramamine Less Drowsy tube contains 8 tablets. They are not chewable and therefore no aspartame.
Note that most or all of the chewable meclizine tablets will contain a sweetner, usually aspartame. For some this is not a problem, for others (like me) it is.
SW