Danhong is Danhong Huayu Oral Liquid, the instructions do not specify the specific course of treatment, clinically generally 2~4 weeks as a course of treatment, the specific medication should follow the doctor’s instructions. Danhong Huayu Oral Liquid contains ingredients such as danshen, peach kernel, safflower and chaihu, etc. After using the medicine, it can activate blood circulation and remove blood stasis as well as move qi to open up the collaterals, and it can be used to treat discomforts caused by stagnation of qi and blood stasis such as blurred vision, and sudden loss of vision. It can also be used for the treatment of central retinal vein occlusion during the absorption phase with the above symptoms. The adverse effects of the drug are not yet clear, but it is necessary to pay attention to the use of bleeding tendency, pregnant women and patients with central retinal vein occlusion hemorrhagic period is prohibited. Yin deficiency and hyperactivity of Yang should be used with caution, there are very few patients who may experience dry mouth and tongue after using the drug. The bleeding and clotting time should be checked regularly during the use of the drug. Avoid spicy and greasy food. The use of drugs need to be under the guidance of a doctor, not self-medication. If there is any discomfort, please consult a doctor promptly.