I'm a type 2 diabetic. The medecine I take affects my blood sugar. The "medecine" that protects me from my medecine is sugar and can be bought anywhere. It's medicinal to me regardless of what any moron TSA agent might think. If my flight is delayed and I can't eat or drink something sugary when I need it, my blood sugar drops and I go into a coma and risk brain damage. Should I depend on the flight attendant to rush me some sugar if I'm about to pass out or should I be allowed to carry it with me? I don't have to rely on sugary drinks in emergencies, I can use sugar pills but his needs are more constant and immediate. I may not agree with this adversarial approach but I sure as hell understand his position.

My father travels with a bottle of juice/soda regularly because it is a reliable, known, and fast way of raising his blood sugar when it gets too low, and it is far more palatable than non-liquid methods of doing so. He has never been hassled when it is explained to a TSA agent (and he has a doctor's note too). Just because it's not prescribed or regulated doesn't mean it can't be medically necessary.

Not to mention I have personally traveled with all kinds of things including Costco-sized bottles of contact lens solution and gigantic aerosol cans... it is what it is and with screening I don't see why TSA can't let people through with it.

Are you a doctor? What qualifications do you have to determine that something does not have a valid medical use?