2. Actions of Lifting, Lowering, Floating and Sinking

Actions of lifting, lowering, floating and sinking refer to the upward, downward, outward or inward directions in which drugs tend to act on the body. Lifting means going up or sending up while lowering means just the opposite. Floating means going outward or sending to the surface, whereas sinking means going inside or purging away. Lifting and floating drugs have upward and outward actions and are used for elevating yang, relieving exterior syndromes by means of diaphoresis, dispelling superficial wind and cold, inducing vomiting, causing resuscitation, etc. Lowering and sinking drugs have downward and inward actions and are used for clearing heat, purgation, promoting micturition, removing dampness, checking the exuberance of yang, sending down an adverse flow of qi to stop vomiting, relieving cough and asthma, improving digestion to remove stagnated food, tranquilizing the mind with heavy properties, etc. As the locations of diseases are different with some in the upper part of the body and some in the lower, some in the interior and some in the exterior, and as the tendencies of diseases are divided into upward (as with vomiting), downward (e. g. diarrhea, metrorrhagia, metrostaxis and proctoptosis), outward (e. g. spontaneous or night sweating) and inward (e. g. internal transmission of exterior syndrome), the lifting, lowering, floating and sinking actions of drugs are used in correspondence with the locations of diseases but in opposition to the tendencies of diseases. Generally speaking, for the diseases located in the upper part or the exterior, it is appropriate to use lifting and floating drugs instead of the lowering and sinking. For example, for the exterior syndromes, lifting and floating drugs should be chosen. On the contrary, for the diseases located in the lower part or the interior, such as dry stool or constipation, it is proper to use lowering and sinking drugs, not the opposite. For the diseases of which the manifestations tend upward, drugs of lowering actions should be given rather than that of lifting, just as in the treatment of headache and vertigo due to hyperactivity of the liver-yang, drugs of lowering and sinking actions should be used to calm the liver and suppress hyperactivity of the liver-yang. On the contrary, for the diseases of which the manifestations tend downward, it is suitable to use lifting drugs instead of lowering drugs. For example, in the treatment of chronic diarrhea and proctoptosis due to sinking of qi of the middle-jiao, it is wise to choose lifting drugs to invigorate qi and lift yang.

Tue lifting, lowering, floating and sinking actions of drugs have close relationship with their properties and flavors. Most drugs that are pungent or sweet in flavor and warm or hot in property have lifting and floating actions, whereas most drugs, bitter, sour, or salty in flavor and cold or cool in property have lowering and sinking actions. The lifting, lowering, floating and sinking actions also have some relationship with the textures of drugs. Generally speaking, most of the light substances have the actions of lifting and floating. In contrast, most of the heavy drugs have the actions of lowering and sinking. However, though some drugs are light, they have lowering and sinking actions; and conversely, some heavy drugs have lifting and floating actions. In addition, the lifting, lowering, floating and sinking actions can also be influenced or even altered through the processing and the joint use of drugs. For example, lowering and sinking drugs can have lifting and floating actions after processing with wine, while lifting and floating drugs can have lowering and sinking actions after preparation with salt solution. If lifting and floating drugs are dispensed together with a great amount of lowering and sinking drugs, they may also have lowering and sinking actions; and similarly, when lowering and sinking drugs are used together with a great amount of lifting and floating drugs, they may exhibit some lifting and floating character.

3. Channel Tropism

Channel tropism refers to a drug's selective therapeutic effects on a certain part of the body. A drug may exert obvious or specific therapeutic action on the pathological changes in a certain channel (including some viscera thereof) or several channels, but with little effects on the others. For instances, among the heat-clearing drugs, some only clear the heat either in the lung channel or in the liver channel or in the heart channel, etc. Again, among the tonics, some strengthen the lung while others strengthen the spleen or the kidney. Channel tropism is based on the theory of viscera, the theory of channels and collaterals, and is summed up according to the curing particular diseases for which a drug is effective.

The human body is an organic whole in which the channels and collaterals link up with the interior and exterior and all parts of the body. A pathological change in the exterior may affect the viscera while diseases in the viscera may, in turn, find expressions in the exterior of the body. For this reason, the symptoms and signs of diseases occurring in different parts of the body can be understood systematically according to the theory of channels and collaterals. For instance, the flaring up of stomach-fire may result in swollen gum; and whenever there is stagnation of liver-qi, pain in the hypochondriac region will be present. Since the swelling and pain of the gum disappear when gypsum is administrated, and hypochondriac pain relieved with ‘the use of bupleurum root, we may infer that gypsum acts on disorders of the stomach channel and bupleurum, the liver channel. The above examples show that the theory of channel tropism is summed up through clinical practice.

The channel tropism theory should be associated with the theories of the four properties and five flavors, and actions of lifting, lowering, floating and sinking of drugs. Different drugs acting on the same channel have different effects owing to their different properties, flavors and actions of lifting, lowering, floating and sinking. For example, scutellaria root, dried ginger, lily bulb, and lepidium seed all act on the lung channel, but scutellaria root can clear lung-heat, dried ginger can warm lung-cold, lily bulb can be used to make up for lung deficiency, and lepidium seed is used to soothe excess syndrome of the lung. Therefore, only when attention is paid to the different aspects of a drug, can its actions be comprehensively analyzed and the drug correctly employed. Besides, according to the theory that viscera as well as channels and collaterals are physiologically related to one another, and pathologically affect one another, when there is pathological change in one channel, drugs acting on other channels should be used in addition to the prescription for the diseased channel itself. For instance, for abnormalities in the lung channel, drugs for strengthening the spleen channel should be added, and in case of hyperactivity of the liver yang, drugs for nourishing the kidney-yin should be used at the same time

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