The bulk-forming laxative group includes the hy-drophilic substances described previously: calcium polycarbophil (FiberCon, Equalactin), methylcellulose (Citrucel), and various psyllium seed derivatives (Metamucil). All act by increasing the bulk of the feces, part of this action being due to their capacity to attract water and form a hydrogel. The increased volume of feces stretches the walls of the GI tract and stimulates peristalsis. Their action may not be evident for 2 to 3 days after starting treatment. Because their use results
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