1, therapeutic effect: can drain, capable, strong, can drain has three meanings: one finger can drain; Bitterness of two fingers can reduce discharge; Three fingers can clear away bitterness, and dryness means that bitterness can strengthen the body. One finger can strengthen yin, that is, purging fire and storing yin, and the other finger can strengthen stomach.

2, adverse effects: can hurt body fluids, stomach and intestines.