Fiber and fiber bulking agents are the laxative treatments most recommended by doctors, according to WebMD. This can come in the form of natural fiber in foods or in some over-the-counter laxatives, such as Benefiber, Equilactin, Metamucil, Citrucel, Fiber-Lax and Fibercon.
While fiber is generally best for typical and slow-transit constipation, there are other laxatives available for varying degrees of severity, WebMD explains. Lubricant laxatives loosen stools by making them slippery with mineral oil and are effective for short-term constipation relief. Stool softeners, such as Colace, may take longer to work, but they are a good option for people who recently had surgery or gave birth. Osmotic laxatives soften stools but depend on a large intake of water to be effective. Stimulant laxatives, such as Senokot, Correctol, Ex-Lax and Dulcolax, provide immediate relief but should not be used regularly.