I'm allergic to dramamine. Break out in hives when I take it. Is Bonine a different drug altogether? If so, I'm guessing I wouldn't necessarily be allergic to Bonine and it would be a safe try. (I'd try it of course a couple weeks before cruising to be sure).
I can get seasick if tossed around pretty good, at least on smaller boats. I didn't get sick on my first cruise on the Grand Princess, although one night in 8' swells I did feel a little uneasy. But she's a significantly larger ship than the Celebration and I'd like to have something along just in case.