Macrostem onion (Xiebai)
Allium macrostemon Bge. (Fam. Liliaceae)
Pharmaceutical Name: Bulbus Allii
macrostemi
Botanical Name: Allium
macrostemon Bge. (Fam.
Liliaceae)
Common Name: Macrostem onion, Bakeri, Bulb of Chinese chive, Long stamen onion bulb.
Source of Earliest Record: Shennong
Bencao Jing
Part Used & Method for Pharmaceutical
Preparations: The macrostem, or bulb, of the onion is dug in May, cleaned
and dried in the sun.
Properties & Taste: Pungent, bitter
and warm
Meridians: Lung, stomach and large
intestine
Functions: 1. To promote the flow of
yang and dissipate cold phlegm; 2. To regulate qi and reduce stagnation.
Indications & Combinations:
1. Cold phlegm stagnated in the chest
manifested as stifling sensation and pain in the chest and dyspnea. Macrostem
onion (Xiebai) is used with Trichosanthes fruit (Gualou) in the formula Gualou
Xiebai Baijiu Tang.
2. Dysentery manifested as tenesmus. Macrostem
onion (Xiebai) is used with Immature bitter orange (Zhishi), Costus root
(Muxiang) and White peony root (Baishao).
3. For Stagnant Qi in Stomach and Intestine
with diarrhea and dysentery with tenesmus,
it is used with Radix Bupleuri (Chai Hu), Radix Paeoniae Alba (Bai Shao), and
Fructus Aurantii Immaturus (Zhi Shi), or with Cortex Phellodendri (Huang Bai)
and Cortex Fraxini (Qin Pi).
Dosage: 5-10 g, decocted in water for
an oral dose.
Cautions & Contraindications:
1. Contraindicated in patients with Deficient
Qi.
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