Laxatives are substances that are used to promote the passing of stools, thereby treating constipation. Laxatives work in different ways and can be taken in the form of liquids, capsules, powders, and tablets. Osmotic laxatives draw water into the stool, helping to soften it naturally. Stimulant laxatives cause intestinal movement, and stool softeners help soften the stool. Laxatives are sometimes used more frequently as a way to cleanse the colon, although laxative abuse can have serious health consequences.