Osmotic laxatives work by increasing the amount of fluid in the large bowel by drawing fluid into it (osmosis). Less fluid is then absorbed into the bloodstream from the large bowel. The bowels become more filled (distended) because of the extra fluid, and the stools are softer.

What laxative makes you poop instantly?

Lubricant laxatives such as mineral oil (liquid petrolatum) Stimulant laxatives are the fastest-acting, such as include aloe, cascara (Nature's Remedy), senna compounds (Ex-Lax, Senokot), bisacodyl (Dulcolax, Correctol), and castor oil.

How do laxatives work in the body?

Several types of laxatives work by pulling water from your body into the intestines, allowing stool to absorb more water for an easier passage. With this method, the only weight you'll lose is from the water you excrete through stool ( 1 ).