Senna Leaf Classic Formulas … Natural Herb Library

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Purges accumulation and relieves constipation quickly ... Fan Xie Ye is a short-course stimulant laxative herb used when stool is dry, obstructed, and difficult to pass.
Drains downward rather than tonifying upward ... its logic is to move stagnation out through the bowels, not to rebuild digestion or moisten deeply over time.
Can reduce fullness from intestinal accumulation ... when distension and pressure come from retained stool, the leaf's purgative action may secondarily ease the bloated feeling.

Single-herb steeping or brief decoction ... the traditional simplest use for acute constipation.
Fan Xie Ye with Zhi Shi or Hou Po ... used when stool retention and abdominal fullness occur together.
Pairings with Ma Zi Ren or honey ... sometimes used to temper harshness while still encouraging passage.

Traditional herb references describe Fan Xie Ye as bitter and cold, entering the Large Intestine to purge accumulation and relieve constipation.
The herb is classically used as a short-course downward-draining medicinal rather than as a tonic bowel regulator.