As mentioned in bookmark p.38, Taxol was the name of a laxative produced in France in the 1930s.
Eno's or Eno's Fruit Salt, whose main ingredient is sodium bicarbonate, was invented in the 1850s by James Crossley Eno of Newcastle upon Tyne, and was marketed as a remedy for digestive upsets and bloatedness, rather than as a laxative per se. However, its 'gentle laxative action' is referred to on the label in this photograph.
It is still manufactured by GlaxoSmithKline, although it was withdrawn from the U.K. market in 2010. It is said to be a popular ingredient in Indian cookery.