This kind of drugs mostly have pungent flavor, performance dispersal, the main into the lung, bladder meridian, bias line muscle surface, so that the surface of the evil dispersed or from the sweat and dissolution, has the effect of sweating to relieve the surface, mainly used for the feeling of the external evil caused by the cold, fever, no sweat (or sweat), floating pulse and other evidence. In addition to the effect of sweating, some of the drugs also have the effect of diuresis, swelling, cough and asthma, rash, pain, sores and so on.The antiexpressive drugs must be selected according to the climate change of the four seasons and the physique of the sick animal, and used in conjunction with the medication.The use of sweating effect of strong antidepressants, do not use too much, so as not to sweat too much, depletion of yang qi, loss of fluid; surface deficiency sweating, yin deficiency sweating, and sores and ulcers for a long time, gonorrhea, blood loss, although there is evidence of the surface, it should be used with caution. The use of antidepressants should also pay attention to the time and place, such as spring and summer coupling loose, easy to sweat, antidepressant dosage should be light, winter coupling dense, not easy to sweat, antidepressant dosage should be heavy; similarly, the north of the cold areas with the drug should be heavy, the south of the hot areas with the drug should be light. The antidepressants are mostly pungent and dispersing products, and should not be decocted for a long time in soup, so as not to reduce the efficacy of the active ingredients by volatilizing them.The antiepidemic drugs can be divided into two categories, which are dispersing wind-cold drugs and dispersing wind-heat drugs.