liver salts 
plural noun British
Salts taken in water to relieve indigestion or nausea.I shall instead drink an explosive emetic solution of Milk of Magnesia, Andrews liver salts, baking soda, lemon juice and prunes all mixed together....
- I thought it was indigestion, and gorged on Gaviscon, Maalox, liver salts and Rennie, but to no avail.
- Boxing Day it's off to Burnley for the in-laws' turkey curry buffet, stopping on the way home to pick up a jar of liver salts for the inevitable stomach cramps that soon follow this mammoth eating fest.