motion sickness
"Used it on my 7 day cruise.  Worked wonderfully during the cruise. No side effects and no nausea, even with 12 to 18 foot seas. About a day after I took the patch off, started having double/blurred vision and am extremely tired, even with 8 1/2 to 9 hours sleep. 4 days later and am still having blurred/double vision and still tired. "