Which drug is effective for cardiac emergencies actually depends largely on what is happening to the patient at the time, and then only then can it be decided which drug is most effective for the patient. For example, if the patient has chest tightness or chest pain, it is recommended to measure the heart rate and blood pressure, and to take nitroglycerin. However, if the patient has chest tightness and chest pain, but the blood pressure is relatively low, taking nitroglycerin may also aggravate the condition, because nitroglycerin is a vasodilator drug. If the patient has a right ventricular myocardial infarction, then it is likely to cause the patient to go into shock. So which emergency drug is the most effective, it mainly depends on how the current condition, if the patient is hypotensive shock, then if necessary, you can drip norepinephrine or dopamine and other antihypertensive drugs. If the patient is in acute heart failure, then drugs such as diuretics and cardiotonic drugs are used.