Laxatives are intended for use by those who have difficulty with constipation. Laxatives work by several mechanisms (stimulant, lubricant, hydrating) for example, to loosen stools. Laxatives may be taken orally or rectally; rectal administration can be by suppository or enema.
Those with eating disorders, however, may attempt to use laxatives (and sometimes diuretics) for weight loss, as a form of purging. They are often unaware that laxatives are ineffective for losing weight: Solid matter has generally had the calories stripped from it, and the remainder of the weight that is passed in a bowel movement is water.
Since laxatives cause so much fluid loss, there is a risk of electrolyte imbalance, in the form of hypokalemia and other problems. These imbalances can be extremely dangerous, potentially leading to heart failure and death.
