Normal people do not make prescription drugs into recreational beverages. And since many derivatives of this are made from codeine, it is very easy to conclude that most of its usage would be in violation of most workplace anti-drug policies.
Normal people don’t join professional sports teams either. Either you have a prescription for the medication, or you don’t. If you do, and your workplace decides to test you and you show up positive for the controlled substance, produce the prescription and that’s that. Some medications instruct you to take them “with food.” Well, how about with fruit juice? Others say it doesn’t matter whether you do or don’t take them with food.