Sodium dihydrogenphosphate is a sodium phosphate. Sodium phosphate is a saline laxative that is thought to work by increasing fluid in the small intestine. It usually results in a bowel movement after 30 minutes to 6 hours.

Sodium dihydrogen phosphate is used as a raw material for the production of sodium hexametaphosphate and sodium pyrophosphate.It is mainly applied in leather processing, boiler water treatment, as a quality improver and baking powder component.It also serves as a buffer and raw material for baking powder in the food industry and fermentation industry, and is used as a feed additive, detergent, dyeing auxiliary, etc.