Tonics
 Drugs which can tonify the Deficient Qi, Blood, Yin And Yang of the body, enhance the body resistance to diseases, and be used in the treatment of various deficiency syndromes syndromes, or supplementing and nourish drugs. Deficiency syndromes are further divided into deficiency of Qi, of Yang, or Blood and of Yin, and accordingly, tonics are divided into four kinds; drugs for tonifying Qi, Yang, Blood and Yin. Because the Qi, Blood, Yin and Yang in the body are interdependent, Yang Xu is often accompanied with Qi Xu, and in turn, Qi Xu is most likely to develop into or lead to Yang Xu. Yang Xu and Qi Xu indicates the physiological hypofunction of the body. Similarly, Yin Xu is usually accompanied with Yin Xu. Blood Xu and Yin Xu indicates the consumption of vital essence, blood and body fluid. For these reasons, drugs for tonifying Qi and Yang and drugs for tonifying blood and Yin are often used together for mutual reinforcement. In cases of Qi and Blood Xu, or Yin and Yang Xu, a therapy of tonifying both Qi and Blood, or both Yin and Yang, should be recommended. In case that pathogens of Shi type are still present and there is no sign of Xu of the Vital Qi, tonics should not be used so as to avoid any interference in the elimination of pathogens which may aggravate the condition. However in cases of coexistence of pathogens and Qi Xu, suitable tonics can be used in addition to drugs for eliminating pathogens in order to strengthen the body resistance to diseases for removing pathogens. Being used over a long period of time, some of the tonics may impede digestion, so they can be supplemented with drugs for strengthening the spleen and Stomach. Effective for Xu conditions as they are, tonics should not be abused, for they may give rise to other problems.

10a Tonics that Tonify QI
 Qi tonics can invigorate the physiological function of the body, and ar mainly indicated for Qi Xu, especially effective for Sp Qi Xu caracterized by anorexia, loose stool, gastric and abdominal distention, lack of vitality, lassitude, edema, prolapse of rectum, and Lung Qi Xu - characterized by short breath, disinclination to talk, breathlessness after movement, spontaneous seating etc. As adequate vital Qi can help generate blood and keep blood flowing within the vessels, Qi tonics are often used in the treatment of Blood Xu syndromes or bleeding due to Qi Xu. Tending to give rise to accumulation of Qi shown as distension and fullness in the chest and abdomen and anorexia, Qi tonics should be used with small aomunts of dugs for pomoting circulation of Qi and digestion.

10b Tonics that Tonify Yang
 Yang Tonics are mainly indicated for Yang Xu syndromes which include Heart Yang Xu, Spleen Yang Xu and Kidney Yang Xu. As the Kidney dominated the Yang of the whole body, various Yang Xu syndromes are often related to Kiney Yang Xu , and the therapy of tonifying Yang always begins with tonifying the Kidney, therefore the theapy of tonifying Yang cheifly refers to warming and tonifying the Kidny Yang. Yang tonics function in reinforcing the Kidney Yang tonifying the essence of life and strengthening the bones and muscles. They are capable of regulating and restoring the functions of Kidney, accelarating growth and enhancing the body resistance. They are mainly indicated for syndrome of Kidney Yang Xu manifested as aversion to Cold, cold limbs, aches and lassitude or cold pain in the loins and knees, impotence, spermatorrhea, sterility due to uterine coldness, lucid and thin leucorrhagia, frequent urination, enuresis, deep pulse, white tongue coating, etc. Because when there occurs failure of the Kidney Yang, the Spleen and stomach can not be warmed and diarrhea may occur, and as the result of Kidney Yang Xu , the Kidney fails in recieving Qi and gives to shortness of breath and dyspnea, some Yang tonics, therefore, can be used to cure diarrhea due to Spleen and Kidney Xu or dyspnea due to lung and Kidney Xu. Most of the Yang tonics are warm and dry in property and can hurt Yin and increase pathogenic fire, so they should not be used in cases of hyperactivitgy of Fire due to Yin Xu.

10c Tonics that Nourish Blood
  Drugs of this type have the effects of tonfying the blood and ar indicated for syndroems of Blood Xu shown as sallow complexion, paleness of the lips, tongue and nails, dizziness, blurred vision, palpitation, delayed menstrual cycle and scanty pale menstrual blood, or even amenorrhea, ect. Some of these drugs also have the effects of reinforcing Yin and are effective for Yin Xu

10d Tonics that Nourish Yin
Drugs of this type function in tonifying the Yin fluid, and promoting the production of body fluid to moisten dryness. They are indicated for Lung Yin xu manifested as dry cough with little sputum and dryness of the mouth and tongue; Stomach Yin Xu manifested as red tongue with little coating, dry throat and thirsty feeling; Liver Yin Xu characterize by blurred vision and zenophthalmia of the eyes, dizziness and tinnitus; and Kidney Yin Xu with manifestations of lassitude a of the loins and legs seminal emission, night seat, etc.