I tried that on my most recent trip I just got back on for a few days and it made me wayyyyyyyyyyyy tired. Like I got the "less drowsy" formula too and I could hardly stay awake. I'm not sure if it helped me at all in the motion sickness area but for me the side effects was enough to have me stop using it. Once I stopped using it my energy was back to what it was before I took it.
So either try and take it before you go to bed (and hope that the most drowsy effects are just when you're sleeping) as some have suggested (which I didn't do) or go in knowing that drowsy can be a side effect for you (obviously it varies from person to person).