And as everyone has said repeatedly, if you NEED something that makes you pee hot, you can get a TUE (proactively or retroactively) for it.

But as it stands your doctor has seemingly said you don't need anything so I'm not sure what you are getting all upset about. At the end of the day, if you are fit and healthy enough to even enter a 100 miler, you probably aren't in desperate need of medication that's prohibited.