For there is no contraindication, adverse reactions to the two drugs, can be brewed under the guidance of a doctor to drink. However, note that the effective dose of herbal tea is limited, generally can not achieve a therapeutic effect, if you want to achieve a therapeutic effect is recommended under the guidance of a doctor for formal treatment.
For example, commonly used chrysanthemum, can clear the liver and eyesight (clear liver fire to promote vision recovery), wind dispersal (evacuation of exogenous wind-heat evil), heat detoxification (clearing the body of heat and toxicity of the evil); cassia seeds can clear the liver and eyesight, laxative, the two drugs can be brewed together, there are no adverse reactions and contraindications, and taken together to enhance the efficacy of clearing the liver and eyesight.
But for some of the existence of contraindications of the drug can not be brewed at the same time. For example, the drugs containing aconite cannot be taken together with those containing piper betel, hemicrania, shellac, bletilla, ampelopsis, etc.; quinoa cannot be taken together with those containing ginseng, sasanqua, xuan shen, bai peony, xin xin, danshen, etc.; licorice cannot be taken together with glycyrrhiza glabra, seaweeds, halibut, coriander and so on.
Also ginseng should not be taken with wulingzhi, cinnamon and erythrite, chuanwu and rhinoceros horn, sulfur and parkerite, cloves and tulip gold.
For two drugs can be brewed together is not clear to consult a doctor in time, taking drugs need to get guidance.