Reed Rhizome Classic Formulas … Natural Herb Library

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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.

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.

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.