Doc is a soft drink that's described as a Dr Pepper/cola hybrid and is distributed by the Pepsi Cola Company.
Doc Cola used to be called doc 360, but has since dropped the 360
It looks like it is mainly being marketed in the Mid-West USA.
It's also available in a diet version called doc zero and is sweetened with aspartame and Ace-K
Doc is marketed in the extreme sports genre.
Ingredients in doc
Carbonated water, high fructose corn syrup, caramel color, natural & artificial flavors, phosphoric acid, sodium benzoate, and caffeine
Sugar content: 70 grams (per 20 ounces).Compare Sugar Content
doc contains 5.00 mgs of caffeine per fluid ounce (16.91mg/100 ml).