Lobelia seeds have the effect of clearing heat and detoxification (removing heat, poison and evil from the body) and relieving cough. Lung Kwai Seed is the seed of Lung Kwai, family Solanaceae. It has the efficacy of clearing heat and removing toxins, resolving phlegm and relieving cough, and is used for sore throat, furuncles (mostly occurring on the limbs or face, small in shape with deep roots, as hard as nails), cough and phlegm. Treatment of sore throat decoction water gargle can have a certain effect; treatment of cough and phlegm asthma, can be taken after the decoction of Longquanzi plus the appropriate amount of rock sugar dissolved to take; treatment of feverish sores, can be with amaranth, honeysuckle and other heat detoxification medicine, pounded, and externally applied to the head, face or limb furuncle place. Those with serious conditions must seek medical attention. Those who have spleen and stomach deficiency and cold (spleen and stomach weakness and cold) should not take Longquanzi, and it is recommended that patients use the medicine under the guidance of a doctor, and do not take the medicine on their own.