古钩藤，中药名。为萝藤科白叶藤属植物古钩藤Cryptolepis buchananii Roem.et Schult.[Trachelospermum cavaleriei Levl.]的根。具有活血，消肿，镇痛的功效。主治跌打骨折，腰痛，腹痛，水肿，痈疮，癣。
Gu-gou-teng, name of Chinese Medicinal Material. It refers to the root of the plant Cryptolepis buchananii Roem.et Schult. [Trachelospermum cavaleriei Levl.], a member of the family Asclepiadaceae. It has the functions of promoting blood circulation, reducing swelling, and relieving pain. It is mainly used to treat fractures, lumbar pain, abdominal pain, edema, abscesses, and eczema.

功效作用 功能
The efficacy and function.

活血，消肿，镇痛。主治
Promoting blood circulation, reducing swelling, and relieving pain. Mainly used for treating...

跌打骨折，腰痛，腹痛，水肿，痈疮，癣。用法用量
Fractures, back pain, abdominal pain, edema, abscesses, and eczema. Dosage and administration.

内服：研末，0.3g；或浸酒。外用：鲜品捣敷；或干品研末敷。化学成分
Internal use: 0.3g of powdered or tinctured preparation. External use: Fresh material pounded for application, or powdered dried material for application. Chemical composition.

根含强心甙白叶藤甙。药理作用
Rhizoma contains cardiac glycosides and white leaf glycosides. Pharmacological effects

云南产白叶藤根中提出的白叶藤甙，可使蛙心停止于收缩状态，使在位兔心及离体豚鼠心脏收缩力加强、心率减慢，继而出现心率不整，最后停止于收缩期，豚鼠心电图观察表现典型的强心甙作用。最小致死量（鸽法）2.914±0.37mg/kg，与侧金盏花甙2.829土O.023mg/kg接近。24小时后测定其平均蓄积率（鸽）为32.5％，较洋地黄毒甙蓄积性低，但较毒毛旋花子甙G高。加工炮制 采收加工
The white leaf vine saponins extracted from the roots of the white leaf vine, produced in Yunnan, can cause the frog's heart to stop in a contracted state, and can enhance the contraction force of the in situ rabbit heart and the isolated guinea pig heart, while slowing down the heart rate. This leads to irregular heartbeats, and ultimately stops in the contracted phase. The electrocardiogram of the guinea pig heart shows a typical positive inotropic effect. The minimum lethal dose (pigeon method) is 2.914±0.37mg/kg, which is close to the dose of saponins from Helleborus thibetanus (2.829±0.023mg/kg). The average accumulation rate (pigeon) measured 24 hours later is 32.5%, which is lower in accumulation than digitalis glycosides, but higher than G-strophanthin. Processing and preparation are required during harvesting and processing.

7-9月采挖洗净，切片，晒干或鲜用。植物学信息 植物种属
Harvest, wash, slice, and dry or use fresh from July to September. Botanical information: plant species.

萝藤科白叶藤属植物古钩藤。形态特征
The plant you are referring to is the ancient hook vine, a member of the Menispermaceae family. It has the following morphological characteristics:

攀援灌木。单叶对生；革质；长圆形或椭圆形，长9-14cm，宽3-5.5cm，基部阔楔形或近圆形，先端钝或近圆形，具小尖，全缘，上面无毛，下面幼时被灰白色短茸毛，老时无毛；具柄。花顶生或腋生，为疏散的聚伞花序；花冠黄色，5裂，裂片狭披针形，长约8mm；副花冠具鳞片5，棒状。蓇葖果圆柱状，从中部以上渐细尖，长约10cm，质硬，直径1-1.5cm。种子黑色，长圆形，长约1cm，压扁，顶部有长毛。花期5月。分布区域
Climbing shrub. Single leaf opposite; leathery; oblong or elliptic, 9-14cm long, 3-5.5cm wide, base broadly wedge-shaped or nearly circular, apex obtuse or nearly circular, with a small tip, entire margin, glabrous on the upper surface, covered with grayish-white short pubescence when young, becoming glabrous when mature; petiolate. Flowers are terminal or axillary, in sparse umbel-like cymes; corolla yellow, 5-lobed, lobes narrowly lanceolate, about 8mm long; corona with 5 scales, club-shaped. Fruit is cylindrical, gradually tapering from the middle upwards, about 10cm long, hard in texture, 1-1.5cm in diameter. Seeds are black, oblong, about 1cm long, flattened, with long hairs at the top. Flowering period is in May. Distribution area.

分布广东、广西。贵州、云南等地。生长环境
Distributed in Guangdong, Guangxi, Guizhou, Yunnan and other regions. Growing environment.

多生于阳坡，攀援于其他树上。
It grows on sunny slopes and climbs on other trees.