1, the most important thing is that “the medicine does not leave the body”. 2, the drug should be “new”, 1 year after the need for new drugs, usually should pay attention to whether the drug has become soft, sticky, discoloration, broken phenomenon, found that the deterioration should be updated immediately, so as to avoid first aid and failure and affect the treatment. 3, to prevent “addiction” often take this type of drugs may also be “addicted”. To prevent “addiction” can be used alternately with two kinds of first aid drugs. 4, in the angina attack first chew and then pressed under the tongue to take, it is more effective. Because after chewing it is easier to dissolve and sublingual mucous membrane absorption, can reach the heart quickly in high concentration, the effect is faster. 5, containing this drug should be taken in a sitting position. Because of the standing position, the head position is higher, often due to peripheral vasodilation and lower blood pressure, causing fainting. Lying down is also inappropriate, because the heart position is low, and a lot of blood flow back to the heart, resulting in a sudden increase in the amount of blood storage in the heart, increasing the burden on the heart. 6, in the case of effective drugs, usually after a few minutes of medication angina should be relieved. If it still does not work, it should be taken again after 5-10 minutes. Repeat this 2-3 times, if still ineffective, you should consider the possibility of myocardial infarction or other diseases, and should immediately go to the hospital for treatment.