Emmenagogues are medicinal substances which promote the menstrual discharge, or restore it when entirely suppressed. The particular emmenagogue required depends upon the cause of the amenorrhea; for example, when anemia is the cause, the preparations of iron prove most effectual; when from plethora, blood letting and cathartics or evacuants are resorted to. Certain medicinal substances excite the pelvic circulation, and stimulate the parts in direct connection with the uterus, and thereby increase or promote the menstrual discharge.

General debility being the cause of the local affection, an active administration of tonics, in connection with the emmenagogue required, is advisable.

The most prominent of this class of emmenagogues are savine, .cantharides, ergot, cotton root, Seneca, snake root, guaiacum, etc., etc.