Mountain dew is a citrus-flavored soft drink, made by the pepsico company. The drink has more caffeine (a stimulant) than other soft drinks like pepsi and coca-cola. Mountain dew is a carbonated soft drink brand produced and owned by pepsico. The original formula was invented in 1940 by tennessee beverage bottlers barney and ally hartman. A revised formula was created by bill bridgforth in 1958. The rights to this formula were obtained by the tip corporation of marion, virginia.