A New York Times article states that Coca-Cola does not offer enough fluid and electrolyte replacement to be good for a typical upset stomach. According to an article in The Daily Mail, doctors use Coca-Cola to treat painful gastric phytobezoars, stomach blockages that lead to bowel obstructions when untreated.
According to The New York Times, Coca-Cola poses a risk in medicinal use for upset stomachs and dehydration because it contains much more glucose than the World Health Organization recommends for rehydration. The Daily Mail notes, however, that Coca-Cola's use in treating gastric phytobezoars is successful in 90 percent or more of cases, indicating at least one legitimate medicinal use for the beverage. The chemical ingredients in Coca-Cola work much like gastric acid, with the fizz in the beverage expediting the process.