Oral rehydration salts: ORS. A solution of glucose-based salt solution used in oral rehydration therapy. WHO and UNICEF recommend a single formulation of glucose-based ORS to treat or prevent dehydration from diarrhea from any cause, including cholera, and in individuals of any age. In technical terms, this ORS solution contains 75 mEq/l of sodium and 75 mmol/l of glucose, and have a total osmolarity of 245 mOsm/l.