I do not get seasick very often so may not have the answer for you but many use the sea bands ..works with pressure points no meds
I found if I am queasy take some flat ginger ale & sip it or ginger capsules
Some lines will have candied ginger out or green apples ...just ask
Go to the lower decks mid ship until you feel better
We have had some rough seas & this works for me but it may not work for others