Hi inky,
If my memory serves me correctly, the OTC pills will only give you a problem if they contain one of the drugs that the company is testing for. Companies test for specific meds, not random ones. The energy drinks are a non-issue. My company even sells Red Bull in a vending maching...
You shouldn't have a problem...I hope.
Greg
"Beauty is truth, truth is beauty - that is all you know on earth, and all you need to know"