Reed Rhizome

Traditional Use

Primary Actions

• Clears heat and generates fluids ... Lu Gen is a classic cooling rhizome for fever, thirst, dry mouth, and irritability after heat injures body fluids.
• Clears Lung heat and relieves cough ... it is used for cough, thick sputum, feverish chest heat, and early warm-disease patterns affecting the respiratory tract.
• Clears Stomach heat and stops vomiting ... traditional use extends to nausea, retching, and thirst when heat in the Stomach pushes qi upward.
• Promotes urination and guides heat out through fluids ... it is chosen when febrile or damp-heat conditions produce scanty urination or heat-strangury irritation.

Secondary Actions

• Lu Gen should be distinguished from Bai Mao Gen ... both are sweet and cooling grasses, but Lu Gen is more about fluids, vomiting, and Lung-Stomach heat, while Bai Mao Gen is more strongly bleeding and urinary-heat focused.
• Fresh Lu Gen is often considered stronger for generating fluids and clearing heat than dried processed segments.

Classic Formulas

• Wei Jing Tang ... classic Lung-abscess and phlegm-heat formula where Lu Gen clears heat and protects fluids.
• Lu Gen Tang ... traditional heat-injuring-fluids and vomiting context that centers the reed rhizome directly.
• Warm-disease combinations with Tian Hua Fen or Mai Men Dong ... common strategy when fever, thirst, dryness, and irritability travel together.

Classical References

• Traditional materia medica describes Lu Gen as sweet and cold, entering the Lung and Stomach to clear heat, generate fluids, stop vomiting, and promote urination.
• Its long-standing food-medicine crossover helps explain why it is often used in convalescent beverages and gentle febrile-support formulas.