motion sickness
"I've used it 3 times now for deep sea fishing.  The first two times, it worked great - no motion sickness. The third time I used it, I almost died.  I threw up for 9 hours.  I was heaving so hard, all of the muscles in my torso are sore.  At the end, there was not even bile in my stomach and I was still heaving.  I had no problems after the patch was removed any of the three times I wore it."