Ed-Spaz is used to treat a variety of stomach/intestinal problems such as spasms and irritable bowel syndrome. In addition, Ed-Spaz is also used to treat other conditions such as bladder and bowel control problems, tightness caused by kidney stones or gallstones, and Parkinson's disease. Ed-Spaz is also used to reduce the side effects of certain medications (medicines used to treat myasthenia gravis) and insecticides.