The 7-up was invented by Charles Leiper Grigg in 1920. He came up with the idea of adding lithium citrate to the drink - one of the drugs currently prescribed for manic-depressive psychosis. In addition, lithium citrate helped relieve hangover syndrome. 7 UP immediately became popular during the Great Depression, and was called lithium lemon soda at the time. The name was soon changed, but lithium was included in the drink until the 50s of the last century, with 7-up being officially considered a patented drug. There are various versions of the origin of the name of the drink. Some argue that the original recipe had 7 components, while others recall the atomic mass of lithium, which is seven. But the name actually comes from the 7oz cans that originally sold the 7 UP.