During the 2017 Tdf, Tim Wellens abandoned during stage 15 due to bad allergies and not being able to breathe. The commentators said that his team would not "give him a waiver" to take allergy meds.
What exactly is a "waiver for medication"? Why does one need one during a major race and why would Wellens' team not give him one?
I can see how something like pseudoephedrine or a steroid could cause someone to test positive for prohibited substances in a race with strict substance rules and testing. Is this the entire reason that he was not granted a waiver?
I would think Wellens could/should have taken something benign to help, like a benedryl, in order to continue the race.