NHE3 inhibitors are used to treat irritable bowel syndrome with constipation (IBS-C) and hyperphosphatemia in chronic kidney disease. NHE3 inhibitors work by blocking the sodium/hydrogen exchanger 3 (NHE3) protein in the intestines and kidneys, which helps to regulate sodium, phosphorus, and fluid balance in your body. These medications are available as oral pills. A main example is tenapanor (Ibsrela, Xphozah).