It is best not to do it yourself without the guidance of a specialized Chinese medicine practitioner. Maoeryancao is used for phlegm-draining asthma and cough. It has the effect of reducing phlegm, relieving cough and relieving asthma. If water drinking is stopped and damp phlegm invades the lungs, causing wheezing and coughing, it is often used together with cinnamon twig, ginger, and scutellaria baicalensis. Moreover, the medicine is always poisonous and should not be used excessively or for a long time. People with spleen and stomach deficiency should use it with caution. It is better to seek expert advice!