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MDX is a Mountain Dew "energy soda" from PepsiCo.

What is ironic is that the caffeine concentration isn't that much higher than standard Mountain Dew.

Marketed as an energy drink - MDX contains many other ingredients typically found in energy drinks - such as Guarana, Taurina, and Panax Ginseng.

By the mid 2010s, MDX had vanished.

Ingredients in MDX

Carbonated Water, High Fructose Corn Syrup, Citric Acid, Natural Flavors, Sodium Benzoate, Gaurana Seed Extract, D-ribose, Caffeine, Maltodextrin, Gum Arabic, Yellow #5, Ascorbic Acid, Calcium Disodium Edta, Taurine, Panax Ginseng Extract, Brominated Vegetable Oil, Blue #1 Calories (per 14oz Bottle): 210.

Sugar content: 56 grams (per 14 ounces).

Compare sugar levels of other drinks

Compared to Other Items

MDX contains 5.88 milligrams of caffeine per fluid ounce (19.87 mg per 100 ml). A 14 fl oz bottle has a total of 82.25 milligrams of caffeine.

Total Caffeine (mg)


From the Mountain Dew website and the American Beverage Association

See more on how we find caffeine amounts.

Last updated on 1 Mar 2021.