1. The similarity between the two is that they are fast-acting and can be used as emergency drugs. In terms of relief, nitroglycerin is stronger, but Compound Salvia Drops has no effect on blood pressure. 2. Compound Salvia Drops can be effective for mild and moderate angina pectoris, but it is not effective for severe. At this time, nitroglycerin containing effect is also poor, must increase the dose, but also with other treatments and drugs (such as intervention, lowering blood pressure, control heart rate to reduce oxygen consumption), because this is closely related to the degree of stenosis of coronary lesions, plaque stability or not, nitroglycerin alone is far from enough, the same reason, compound Dan Shen drops is also. This is the result of not dialectical use of drugs. 3. Compound Salvia Drops is widely used for cardiac neurosis, esophagitis, gastritis and intercostal neuralgia, because the function of Compound Salvia Drops is to activate blood circulation, resolve blood stasis and regulate qi. This is one of the advantages of the drug, and conversely, one of the areas of disagreement by Western medicine practitioners. It is also important to point out that if chest tightness with nitroglycerin is effective, coronary angina should be highly considered, while the possibility of coronary angina is only about 50% for those who are effective with compound Salvia drops.