Dendrobium and maitong are not recommended to drink in water every day. Dendrobium and maitong are cold in nature, so it is not recommended to drink water every day for patients with cold spleen and stomach (spleen and stomach weakness and cold) and weak constitution, so as not to hurt the stomach yang, diarrhea, abdominal pain, nausea, vomiting and other adverse reactions, which will aggravate the condition. Dendrobium, taste sweet, sex slightly cold. It belongs to the stomach and kidney meridians. It has the effects of benefiting the stomach and generating fluids (nourishing the stomach by replenishing the fluids in the stomach), nourishing yin and clearing heat (nourishing the yin essence and clearing away heat). It is used in treating heat illness with fluid injury, dry mouth and thirst, deficiency of stomach yin (insufficient yin fluid in the stomach), scarcity of food and dryness of vomiting, and non-resolving of deficiency heat after illness. It is forbidden to be taken by those who have not injured the yin in the early stage of warm-heat disease, those who have not transformed the dryness in wet-heat disease, and those who have deficiency and coldness in the spleen and stomach. Ophiopogon is sweet, slightly bitter and slightly cold in nature. It belongs to heart, lung and stomach meridians. It has the effect of nourishing yin and generating fluids, moisturizing the lung and clearing the heart. It can be used for dry lung cough, consumptive cough, paralysis of the throat (pharyngeal redness, swelling and pain, or dryness, foreign body sensation, or pharyngeal itching and discomfort, difficulty in swallowing), sore throat, thirst due to injury of the body fluid, internal heat and thirst (internal fever accompanied by symptoms such as overeating, excessive drinking, excessive urination, etc.), heartburn, insomnia, intestinal dryness, constipation, etc. The effective dosage is limited. The effective dose of water is limited, it is difficult to achieve the above effects, it is recommended to take both under the guidance of a doctor, do not take medication on your own, so as not to produce adverse reactions aggravate the condition.