逍遥散 Xiao Yao San

A classic Chinese herbal formula · Song dynasty, c. 1107

Xiao Yao San

“Free and Easy Wanderer” — 逍遥散, xiāo yáo sǎn

Botanical illustration of the eight herbs of Xiao Yao San arranged around a clay decoction pot

Xiao Yao San is one of the most prescribed formulas in all of Chinese medicine — an eight-herb preparation first recorded in the Song dynasty's imperial formulary, and still used daily by practitioners around the world for stress, irritability, menstrual discomfort, and the pattern classical medicine calls liver qi stagnation.

The eight ingredients

Every herb in the formula has a defined role — a chief sets the direction, deputies reinforce it, assistants manage side effects, and envoys harmonize the whole. Select any herb for its full monograph.

Illustration of Bupleurum root (Chái Hú) Chief Chái Hú 柴胡 Bupleurum root Illustration of Chinese angelica root (Dāng Guī) Deputy Dāng Guī 当归 Chinese angelica root Illustration of White peony root (Bái Sháo) Deputy Bái Sháo 白芍 White peony root Illustration of White atractylodes rhizome (Bái Zhú) Assistant Bái Zhú 白术 White atractylodes rhizome Illustration of Poria sclerotium (Fú Líng) Assistant Fú Líng 茯苓 Poria sclerotium Illustration of Honey-fried licorice root (Zhì Gān Cǎo) Envoy Zhì Gān Cǎo 炙甘草 Honey-fried licorice root Illustration of Chinese mint (Bò He) Adjunct Bò He 薄荷 Chinese mint Illustration of Roasted ginger (Wēi Jiāng) Adjunct Wēi Jiāng 煨姜 Roasted ginger

Two further herbs — mǔ dān pí and zhī zǐ — turn the base formula into Jia Wei Xiao Yao San, the most widely used variant.

What Xiao Yao San is used for

In traditional terms, Xiao Yao San addresses liver qi constraint with blood deficiency and a weakened spleen[2] — a pattern whose everyday face is familiar: tension and irritability, mood swings that worsen with stress, premenstrual breast tenderness and irregular cycles, fatigue, poor appetite, and digestive upset under pressure. Practitioners today most often reach for it in cases involving stress, PMS, and mood — and modern clinical research has focused on exactly these areas. Our benefits page reviews what the studies actually show, graded by the quality of the evidence.

Safety at a glance

Xiao Yao San has a long history of use and is generally well tolerated, but "herbal" does not mean "risk-free": licorice root interacts with several medications, and anyone pregnant, nursing, or taking prescription drugs should talk to a clinician first. The safety page covers side effects, interactions, and quality concerns in detail.

One formula, several forms

The classical preparation is a powder (san 散) drawn as a draft, but today you will most often meet it as Xiao Yao Wan — teapills — or as concentrated granules. Two added herbs turn the base formula into Jia Wei Xiao Yao San, the "augmented" version used when the same pattern runs hotter. See how to take it for forms and typical dosing.

The name

Xiāo yáo — free, unfettered wandering — is borrowed from the opening chapter of the Daoist classic Zhuangzi. The formula's promise is in its name: to restore the ease of someone strolling without a destination. The history page traces the formula from the Song imperial pharmacy to the modern dispensary[1].

References

  1. Taiping Huimin Heji Ju Fang (太平惠民和剂局方, Formulary of the Pharmacy Service for Benefiting the People in the Taiping Era), Song dynasty, c. 1107. ↩
  2. Scheid, Bensky, Ellis & Barolet, Chinese Herbal Medicine: Formulas & Strategies, 2nd ed., Eastland Press, 2009. ↩