Physical Properities: Yellow acicular crystals

Pharmacological action：Quercetin has a good expectorant, cough, and a certain antiasthmatic effect, used in the treatment of chronic bronchitis. In addition, it has the effects of lowering blood pressure, enhancing capillary resistance, reducing capillary brittleness, lowering blood lipids, expanding coronary arteries, increasing coronary blood flow, etc., and has an auxiliary therapeutic effect on patients with coronary heart disease and hypertension.