Rhizoma Phragmitis
Source
The fresh or dried rhizome of Phragmites communis Trin., family Gramineae.
Characteristics
Rhizome long-terete, the dried sample flattened, unequal in length, 1-2
cm
in diameter; yellow-white to dull yellow in colour, the surface lustrous;
nodes obvious, with relic fibrous root scars and buds. The section is
hollow, and with a thin wall and an annular vessel pore. Sweet in taste,
cold in nature, and attributive to lung and stomach channels.
Indication
1. Clear away heat and promote the production of fluid: For febrile diseases
or those with thirst and consumption of body fluid.
2. Clear away stomach-heat and stop vomiting: For stomach-heat syndrome
with vomiting and hiccup.
3. Clear away lung-heat to relieve cough: For cough of lung-heat type
and pulmonary abscess.
4. Open the inhibited lung energy and let out the skin eruption: For 
common
cold of wind-heat type, and initial stage of measles with incomplete eruption.
5. Promote diuresis: For febrile disease with oliguria and reddish urine,
and stranguria of heat type.
Pharmacological
Action
Coixol and asparagine are two active components and possess antipyretic,
antidiptic and antemetic effects.
Administration Decoction: 15-30g.