1, angina attack avoid upright containing drugs. Angina attack, should immediately contain 1 piece of glyceryl trinitrate under the tongue, or chewed and contained under the tongue, containing the drug can not stand, so as not to suddenly faint and fall, should sit and lean on a wide chair or stool; 2, with hypotension, bradycardia, pulmonary heart disease, bronchitis target=_blank>chronic bronchitis, cardiac insufficiency, asthma, coronary artery disease patients, avoid using or prohibit insulin. Because of the role of both blood pressure and anti-arrhythmia, only for patients with hypertension or tachycardia of coronary heart disease; 3, long-term use of the coronary heart disease patients, do not suddenly stop taking the drug, or cause “rebound”, aggravating angina or even myocardial infarction; 4, tachycardia is contraindicated with heart treasure, bradycardia is contraindicated with live Heart pills; 5, coronary heart disease patients with liver disease, avoid the use of the heart, heart Shu, heart Ping, Tiamaxinan, etc.; 6, avoid self-advocacy arbitrary combination of drugs. In the clinical findings, the combination of isobaric acid, can occur bradycardia, hypotension, heart failure, and even cardiac arrest in serious cases; and digitalis and isobaric acid combined, sudden death can occur; 7, do not take the initiative to arbitrarily increase or decrease the amount of medication. Some patients are eager to cure the disease, unauthorized increase in the amount, but the results are not fast, such as nitroglycerin is a quick-acting drugs to relieve angina pectoris, individuals because of a containing the effect of not, in a short period of time to take several tablets or even more than 10 tablets, the results are not only ineffective, but increased pain. Because, arbitrarily increase the amount of nitroglycerin not only produce resistance, but also directly cause coronary artery spasm; 8, with glaucoma patients, caution or avoid the use of glyceryl trinitrate.