"Dramamine" the brand has 2 versions with different active ingredients - the original is dimenhydrinate, which can cause drowsiness. The "non-drowsy" version is meclizine, which is what the name brand Bonine is. I've used meclizine for years, got a huge bottle for very little money at Costco. I'm not often bothered by seasickness but it's nice to have with me just in case - we've been on a couple trips where we were some of the few people on deck, it was so bad...

[I'm editing a couple days later to add that this is for the US - I know brands & active ingredients in other countries can vary]