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First in point of efficacy for this purpose are the hydragogue cathartics.

Cathartics, especially those of a hydragogue nature, are also very beneficial.

It is characteristic of this purgative that it is a hydragogue even in minimal dose, the fluid secretions of the bowel being most markedly increased.

Hydragogue, hī′dra-gōg, n. a very active purgative, such as jalap.

In medicine it is frequently employed as a hydragogue purgative, specially valuable in febrile diseases, in congestion of the portal system, and in the obstinate constipation of painters’ colic.