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Irritants that stimulate the muscular action of the intestines (cascara, phenolphthalein, senna); compounds that increase the amount of bulk in the intestines either by withdrawing water from the body (salines such as Epsom salts, citrate of magnesia) or by increasing the bulk when combined with fluids (agar-agar, bran, the various cellulose substances); and lubricants such as mineral oil, which ease the passage of waste and counteract excessive drying of the intestinal contents.
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