Brother Zhou Daoyi, stiff neck, caused by phlegm obstruction. Drool-Controlling Pill 1.2g. Note, the Drool-Controlling Pill is composed of equal parts of Gansui Root, Peking Euphorbia Root, and white mustard seed. It is a prescription from the Song Dynasty's Chen Wu-zhai's "Sanyin Jiyi Bingzheng Fanglun," and is an effective remedy for treating phlegm accumulation, water retention, scrofula, and other conditions. Mao Shihong renamed it Zilong Pill in his "Jishi Yangsheng Ji," stating that it can treat phlegm blockage in the chest and diaphragm, burning pain in the chest, back, hands, feet, waist, and neck due to bone traction, wandering pain, or cold and numb hands and feet, blocked qi and blood vessels, as well as throat obstruction resembling a plum pit, appearing and disappearing intermittently, causing choking and fainting, and lumps all over the body resembling pomegranates or chestnuts, with unchanged skin color, no pain or itch, but a feeling of soreness and numbness, or spontaneous ulceration and oozing of water-like saliva, unresponsive to other medications, or conditions like fistula disease, all caused by phlegm stagnation in the meridians and collaterals. Taking this pill can lead to a cure. Mr. Fan Wenfu used this to treat stiff neck, which is derived from this understanding.