Whether or not a heartbeat of about 120 is dangerous after drinking alcohol is mainly determined by individual circumstances. For people who are healthy, there is generally little danger, but for people with underlying diseases, there is a certain degree of danger. 1. No underlying disease: drinking alcohol can lead to sympathetic nerve excitation, which leads to increased heart rate. For healthy people with no underlying disease, if there is no obvious discomfort other than increased heart rate, there is generally no danger, and appropriate rest can be taken after stopping drinking alcohol. 2. People with underlying diseases: For people with hypertension, coronary atherosclerotic heart disease and other underlying diseases, drinking alcohol can lead to aggravation of the disease and may induce acute cardiovascular and cerebrovascular diseases such as myocardial infarction, so it is somewhat dangerous. Drinking alcohol is harmful to health and should be avoided. If your heart beats faster after drinking alcohol and you feel sick, you should consult a doctor and get treatment according to the doctor’s advice.