Nuo Dao Gen Xu 糯稻根须 — Chinese Herbal Medicine

Nuo Dao Gen Xu (糯稻根须) At a Glance

• Herb: Nuo Dao Gen Xu
• Chinese name: 糯稻根须 (Nuo Dao Gen Xu)
• Latin name: Radix et Rhizoma Oryzae Glutinosae
• Nature: Neutral
• Taste: Sweet
• Meridian: Heart
• Category: Strengthen the exterior and stop sweating

The name 糯稻根须 (nuò dào gēn xū) translates as “glutinous rice root beard,” referring to the fibrous rootlets harvested from Oryza sativa var. glutinosa after the grain is gathered in autumn. Mild and sweet in character, this unassuming root fragment acts on wei qi and yin fluids simultaneously, sealing the body surface against unwanted fluid loss. Clinically it stands as a primary agent for deficiency sweating — addressing both the spontaneous daytime sweating of qi vacuity and the drenching night sweats of yin deficiency.

Actions & Therapeutic Effects

• Consolidate the exterior and stop sweating — restrains leakage of wei qi through the pores; effective for both spontaneous sweating and yin-deficient night sweats
• Tonify deficiency and strengthen the body — supplements qi and yin in states of chronic depletion, post-illness recovery, or prolonged febrile illness
• Clear vacuity heat — gently reduces low-grade fever and steaming-bone disorder arising from yin deficiency
• Benefit the stomach and promote appetite — mild tonic action on the middle jiao; supports convalescent patients with poor appetite
• Calm the Heart and quiet the spirit — used adjunctively for palpitations and restless sleep accompanying deficiency-pattern sweating
• Dispel dampness and reduce jaundice — classical texts cite use in mild damp-heat jaundice and hepatitis patterns

Clinical Applications in TCM

• Spontaneous sweating from qi deficiency: combine with Huang Qi (黄芪) and Bai Zhu (白术) to augment wei qi and secure the surface
• Night sweats from yin deficiency: pair with Mu Li (牡蛎), Di Gu Pi (地骨皮), and Fu Xiao Mai (浮小麦) in variations of Mu Li San (牡蛎散)
• Post-febrile debility with persistent low-grade fever: use with Bie Jia (鳖甲) and Qing Hao (青蒿) to clear vacuity heat while nourishing yin
• Chronic fatigue with profuse sweating: combine with Dang Shen (党参) and Wu Wei Zi (五味子) in qi-consolidating formulas
• Convalescent weakness with poor appetite and sweating: add to Si Jun Zi Tang (四君子汤) base to support middle jiao recovery alongside surface consolidation
• Mild damp-heat jaundice as adjunct: use alongside Yin Chen Hao (茵陈蒿) and Zhi Zi (栀子) to support liver-gallbladder clearing

Precautions & Safety

• Dosage: 15–30 g in decoction (up to 60 g for severe deficiency sweating); decoct 20–30 minutes; fresh root may be used in larger quantities
• Contraindications: Avoid in excess-pattern sweating such as active exterior wind-cold invasion where sweating serves a therapeutic purpose; not indicated in damp-heat patterns without yin deficiency
• Interactions: No significant herb–drug interactions documented; exercise clinical awareness when combined with pharmaceutical anticholinergic agents that also suppress sweat-gland secretion

Classical TCM Formulas

• Mu Li San (牡蛎散) + Nuo Dao Gen Xu: Duan Mu Li, Huang Qi, Ma Huang Gen, Fu Xiao Mai + Nuo Dao Gen Xu — enhanced sweat-stopping.
• Nuo Dao Gen Xu decoction alone: for mild spontaneous sweating.
• Food therapy: Nuo Dao Gen Xu decocted with Nuo Mi — for Spleen deficiency with sweating.

Herb Combinations

• Nuo Dao Gen Xu (糯稻根须) + Fu Xiao Mai (浮小麦) + Huang Qi (黄芪): the sweat-stopping trio for spontaneous sweating from Qi deficiency.
• Nuo Dao Gen Xu (糯稻根须) + Duan Mu Li (煅牡蛎) + Wu Wei Zi (五味子): astringes and stops night sweats from Yin deficiency.
• Nuo Dao Gen Xu (糯稻根须) + Bai Zhu (白术) + Fu Ling (茯苓): astringes sweat while tonifying Spleen for chronic Qi deficiency.

Pharmacology & Research

Antidiaphoretic: arabinoxylan polysaccharides reinforce epithelial tight junctions, reducing transepidermal fluid loss in sweat-gland secretion models.
Adaptogenic: hemicellulose fractions modulate HPA-axis cortisol response, supporting recovery from chronic stress-related qi and yin depletion.
Hepatoprotective: flavonoid glycosides reduce ALT/AST elevation in CCl₄-induced hepatotoxicity models, consistent with classical jaundice indications.
Immunomodulatory: beta-glucan constituents upregulate NK-cell activity and macrophage phagocytosis, reinforcing surface-defensive wei qi function.

Classical Descriptions

• “糯稻根须，止虚汗，退骨蒸，益胃气。”
• — Zhao Xue-min, Ben Cao Gang Mu Shi Yi (本草纲目拾遗), Qing Dynasty