Mao Dong Qing

Anticoagulant and antiplatelet drugs (warfarin, heparin, aspirin, clopidogrel): Mao Dong Qing contains triterpenoid saponins with demonstrated anti-thrombotic and anti-platelet aggregation activity. Clinical observations have documented prolonged clotting time and prothrombin time in some patients. Concurrent use with anticoagulant or antiplatelet medications may have an additive effect, increasing the risk of bleeding complications (nosebleeds, gum bleeding, subcutaneous haemorrhage, increased menstrual flow, gastrointestinal bleeding). Close monitoring of coagulation parameters (INR, PT) is essential if combined use is unavoidable.

Antihypertensive medications: Animal studies show that Mao Dong Qing flavonoid glycosides have a slow but sustained vasodilatory and blood-pressure-lowering effect. Concurrent use with antihypertensive drugs could theoretically potentiate hypotension, though human evidence is inconsistent. Blood pressure should be monitored.

Hepatotoxic drugs: Since high doses or prolonged use of Mao Dong Qing has been associated with liver enlargement and jaundice, concurrent use with other hepatotoxic medications (e.g. paracetamol/acetaminophen in high doses, statins, certain antibiotics) should be approached with caution and liver function should be monitored.

Ilex pubescens Hook. et Arn. is an evergreen shrub or small tree in the Aquifoliaceae (holly) family, typically growing 3 to 4 metres tall. The slender young branches are nearly four-angled, greyish-brown, and densely covered with long, stiff hairs, which gives the plant its Chinese name (毛 máo means "hairy"). Leaves are alternate, papery to membranous, ovate or elliptic, 2 to 6.5 cm long and 1 to 2.7 cm wide, with sparse small teeth along the margins and coarse hairs on both surfaces, especially dense along the veins.

The plant is dioecious (male and female flowers on separate plants). Flowers are clustered in the leaf axils, pink or white, appearing from April to July. The fruit is a small spherical drupe about 3 to 4 mm in diameter, turning bright red when ripe from July to November, with typically 6 small stones inside a near-woody endocarp. Mao Dong Qing grows naturally at elevations of 100 to 1000 metres in hilly scrublands, forest margins, roadsides, and stream banks across subtropical southern China.

Mao Dong Qing is not an herb of the ancient classical tradition. It entered the Chinese pharmacopoeia through folk medicine of the Lingnan (岭南) region, the subtropical area encompassing Guangdong and Guangxi. It is recorded as a Yao ethnic minority (Yáo zú 瑶族) customary medicine. The name literally means "hairy holly" (毛 = hairy/pubescent, 冬青 = holly), referring to the characteristic dense hairs covering its branches, leaves, and flower parts.

Its rise to prominence came in the mid-20th century. In 1955, practitioners in Wuhua County, Guangdong, successfully used Mao Dong Qing to treat thromboangiitis obliterans (Buerger's disease). This clinical success triggered pharmacological investigation, and by the 1960s and 1970s, extensive clinical studies across Guangzhou, Beijing, Fuzhou, and Tianjin confirmed its value for cardiovascular diseases, especially coronary heart disease and angina pectoris. It was included in the 1977 edition of the Chinese Pharmacopoeia, though it was removed from subsequent editions and is now governed by provincial standards (Guangdong Provincial Standard, 2011 edition). Various preparations were developed, including tablets, granules, syrups, and injectable forms containing its key active flavonoid glycosides.

Its folk aliases tell a story: "乌尾丁" (Wū wěi dīng) and "痈树" (yōng shù, "abscess tree") reflect its traditional use for infections and skin conditions; "喉毒药" (hóu dú yào, "throat toxin medicine") points to its use for sore throats and tonsillitis; and "六月霜" (liù yuè shuāng, "June frost") evokes its cooling, Heat-clearing nature in summer. In Guangdong, its tender leaves are also brewed as a bitter tea, sometimes referred to as a type of kǔ dīng chá (苦丁茶).