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【Nature and flavor and meridians】Sweet, neutral.

【Function】Strengthen the spleen, nourish the lungs, consolidate the kidneys, and improve the essence.

[Indications] Spleen deficiency diarrhea, chronic dysentery, consumptive cough, thirst, spermatorrhea, leucorrhea, frequent urination. Tonifies the spleen and stomach, promotes fluid production and benefits the lungs, and nourishes the kidneys and astringes semen. Used for spleen deficiency, poor appetite, chronic diarrhea, asthma and cough due to lung deficiency, spermatorrhea due to kidney deficiency, leucorrhea, frequent urination, and thirst due to deficiency heat. Fried yam with bran tonifies the spleen and stomach. Used for spleen deficiency, poor appetite, diarrhea, loose stools, and excessive leucorrhea.

【Precautions】Do not take this medicine if you have solid evil.

① "Compendium of Materia Medica" says: Ganoderma lucidum is the messenger, and it hates sweetness. ② "Tangye Materia Medica" says: Ermendong is the messenger.

【Medical records】

"Ben Jing": "It is used to treat injuries, replenish deficiency, eliminate cold and heat evil spirits, replenish the middle and strengthen the body, grow muscles, and long-term use can improve hearing and eyesight."

"Bie Lu": "It can treat wind wandering in the head and face, wind head (also known as 'head wind') and dizziness, relieve gas, stop waist pain, treat asthenia and emaciation, replenish the five internal organs, eliminate restlessness and heat, and strengthen the joints."

"Materia Medica": "It can replenish the five kinds of fatigue and seven kinds of injuries, remove cold wind, stop waist pain, calm the mind, replenish the insufficient heart qi, and can be used for patients with physical weakness."

"Dietary Therapy Materia Medica": "It can cure headaches and help boost yin energy."

"Rihuazi Materia Medica": "It helps the five internal organs, strengthens the tendons and bones, improves the mind and calms the spirit, and cures spermatorrhea and forgetfulness."

Zhu Zhenheng: "Pounding and applying the raw material to the swelling and hard toxins can dissipate it."

"Shang Han Yun Yao": "Replenish the deficiency and clear the deficiency heat."

"Compendium of Materia Medica": "It nourishes the kidney qi, strengthens the spleen and stomach, stops diarrhea, resolves phlegm and saliva, and moisturizes the skin and fur."

【Predecessors release medicine】

Li Gao: Zhongjing Bawei Wan uses dried yam because it is cool and nourishing. It can also treat dry skin by moistening it.

"Yi Jing Su Hui Ji" says: Although dried yam enters the hand Taiyin meridian alone, it can also strengthen the yin. Moreover, the hand Taiyin is the upper source of the foot Shaoyin. Since the source is nourishing, the flow will surely be beneficial.

"Compendium of Materia Medica": Chinese yam can strengthen the spleen and replenish deficiency, nourish essence and strengthen the kidney, treat all kinds of deficiency and damage, and cure five kinds of fatigue and seven kinds of injuries. However, its qi is light and slow, so it is not suitable for special tasks. Therefore, to replenish the spleen and lung, ginseng and astragalus must be used, and to replenish kidney water, cornel and rehmannia must be used. It is astringent and turbid, so it must be broken and ground together. Cuscuta australis can help to cure incontinence. All pills are made of pills, and they should also be ground into paste. In short, the nature and taste are weak, but it can be used as an adjuvant.

"Pharmaceutical Chemistry": Chinese yam is warm and nourishing without being abrupt, slightly fragrant without being dry, and has the function of regulating the lungs. It is a good medicine for treating chronic cough caused by lung deficiency. Because it tastes sweet and has a fragrant smell, it can help the spleen and treat diarrhea caused by spleen deficiency, laziness and sleepiness, and fatigue of the limbs. In addition, its sweetness can nourish yang, and it can nourish the middle and replenish qi, warm and nourish the muscles. It is an important medicine for the lungs and spleen. The earth is strong and produces gold, and the gold is strong and produces water. The functions are the same, so it is used in Liuwei Pills to treat kidney deficiency and low back pain, spermatorrhea, nocturnal emission, and impotence caused by weakness. However, it is slow in nature and weak in effect, so the dosage should be doubled.

"Compendium of Materia Medica" states: Chinese yam is originally a food. Ancient people used it in decoctions, saying that it can nourish the spleen, replenish qi and remove heat. However, although the qi is warm, it is flat. It nourishes the yin of the spleen and lungs, so it can moisturize the skin and hair and grow muscles. It is not like Astragalus, which is warm in nature and can nourish the lung yang, and Atractylodes, which is bitter and dry and can nourish the spleen yang. Moreover, it is astringent in nature and can cure spermatorrhea. It tastes sweet and salty, and can nourish the kidney and strengthen yin. Therefore, Liuwei Dihuang Pills use it to assist Rehmannia. However, although it is yin in nature, it is not very stagnant, so it can penetrate dampness to stop diarrhea. Raw pounding and applying to carbuncle can reduce swelling and hardness, which also means nourishing yin and reducing fever. As for the saying that it can nourish yang and reduce swelling, replenish qi and remove stagnation, although the logic is understandable, the language is involved and confusing, and it seems not to be correct. As for using it in decoctions to treat fire deficiency and critical symptoms, it is difficult to achieve immediate results. It must be used more often to cure it because of its gentle nature. It should be used raw in nourishing yin medicines, and fried until yellow when used to nourish the spleen.

"Reading the Classic of Materia Medica": Chinese yam can nourish the kidney and replenish essence. If the essence is sufficient, the yin will be strong, the eyes will be bright, and the ears will be sharp. All the