Danshen injection is a kind of Chinese patent medicine, which can be injected intramuscularly. Intramuscular injection can be injected 2-4ml once, and can be injected 1-2 times a day. It can also be administered intravenously, 4ml at a time, diluted with 20ml of 50% glucose solution and used 1-2 times a day. Another use is the intravenous drip method, which is also the most widely used in clinical practice. It is usually used 10-20ml per dose, diluted with 100-500ml of 5% glucose solution, once a day. The treatment cycle is about 7-10 days. This medicine helps to improve the symptoms of chest tightness and chest pain, and can help to activate blood circulation and remove blood stasis, as well as to open the veins and nourish the heart.