Sodium Picosulphate belongs to the class of medicines known as stimulant laxatives. It functions by softening the stool and allowing it to easily pass out of the body. The mechanism of action of Sodium Picosulfate is to gently activate the bowel muscles to accelerate peristalsis and force the contents of the intestine out of the body. Laxatives bring water into your intestine and energize the colon to expel the contents out of it.