Hydrogogue is a substance that promotes watery evacuation of bowels.Fumaric acid salts can be used as hydrogogue cathartics.Fumaric Acid Salts as Hydrogogue Cathartics. Charley J. Smyth, Robert Brundage, James M. Orten and Arthur H. Smith, Exp Biol Med., November 1945, vol. 60, no. 2, pages 301-303, 10.3181/00379727-60-15168
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