AMP Energy is an energy drink distributed by PepsiCo under the Mountain Dew brand. Launched in 2001, AMP was originally known as Mountain Dew AMP. From 2007 to 2008, several additional flavors of AMP were introduced. In 2012, AMP labeling and ingredients changed, as did the flavor and appeal, according to fans.ountain Dew Energy was released in Ireland in April 2011. Produced in a lemon and lime flavor, it has a higher caffeine content than Mountain Dew sold in the U.S., at 18 mg per 100ml, versus 91 mg per 20 fl oz in the U.S. version (which is ~15.385 mg per 100ml).