Mountain Dew MDX
Mountain Dew MDX's Bottle design.
Flavor: Citrus
Color: Yellow-Green      
Current Status: Discontinued
Locations Available: United States
Year(s) Available: 2005 - 2007
Related Flavors: Sport, Dew FuelAmp, Energy, Energized, Adrenaline, Mountain Dew AMP, Kickstart (Limeade), Game Fuel (Lemonade), Distortion, Lemon, Lime, Kickstart (Original Dew), Kickstart Ultra (Original Dew), Amp Game Fuel Charged (Original Dew), Electric Charge Freeze, Spiked (Lemonade)
Related Promotions: N/A

Mountain Dew MDX was a Mountain Dew energy drink variant that lasted from 2005 and until 2007. It was PepsiCo's attempt to compete with Coca-Cola's Vault energy drink.


MDX was the original Mountain Dew flavor formula, but with ingredients added such as maltodextrin, ginseng, taurine, d-ribose, and guarana to give it the energy drink kick. It also had a higher caffeine content than original Mountain Dew, despite having the same basic taste and color.


  • Mountain Dew MDX was originally called Mountain Dew X. It was most likely to be the prototype name of MDX.
  • This was only one of many attempts at a Mountain Dew energy drink. See Related Flavors in the infobox for more.
  • MDX was the pioneering flavor for the Sidekick bottle design, which PepsiCo would incorporate into most of their 20 oz. bottle designs later on in the 2010s, replacing the dome-like design.