钩藤为中医的兒科要藥,早在第五、六世紀时我國学者已有論及。藥用部分是钩藤植物花序柄变成的钩狀物以及相連的一小部分枝条。李时珍称“古方多用皮,后世多用钩,取其力銳耳”。可見枝皮的效力不及鉤,钩多枝少則效强,钩少枝多则效弱。現时广州市售的钩藤,多为钩与枝混雜,未見出售純钩,只是枝的夾雜量多寡有異。据作者調查,廣州市中藥店所售鉤藤有“單钩”与“双钩”之別,双钩的价格比單鈎的貴兩倍。又据中國藥学大辞典載,純用嫩钩,效力要大十倍,但現时中藥店內並無嫩鈎与 Uncaria is a pediatric medicine for Chinese medicine. It was already discussed by Chinese scholars as early as the fifth and sixth centuries. The medicinal part is the hook-like material that the inflorescence stem of uncaria plants turns into, and a small number of connected branches. Li Shizhen said that “the ancient side has many skins, and later generations use hooks to take their sharp ears.” Visible than the efficiency of the skin of the hook, the hook is less effective than multiple branches, hooks and more branches are more effective. At present, uncaria on the market in Guangzhou is mostly mixed with hooks and sticks. No pure hooks are sold, but the amount of inclusions in the branches varies. According to the author’s investigation, the Uncaria sold in Guangzhou’s pharmacies has the distinction between “single hook” and “double hook”, and the double hook is twice as expensive as the single hook. According to the Chinese Pharmaceutical Dictionary, the use of a tender hook is ten times more effective. However, there is no tender hook in the existing Chinese medicine shop.