I use Bonine. It does not make me sleepy. It also has fewer contraindications than Dramamine. Do not get confused when you are in the store. Dramamine II is the same thing as Bonine: 25mg meclizine HCL. Original Dramamine is
Babette gave a pretty good reply...except that she did forget to relate that Bonine (meclizine) can possibly cause drowsiness also. The incidence is not as high with Bonine (~1-5%) as with Dramamine (dimenhydrinate; ~12-18%), Both have about the same relative effectiveness in preventing sea sickness. The big benefit in taking Bonine or other meclizine products over Dramamine/dimenhydrinate products is that you only need to take Bonine once or twice a day, where Dramamine should be taken every 6 hours.