Danshen drops can be taken for a long time. The main ingredient of Danshen drops is salvia, and the main ingredients of compound Danshen drops are salvia, panax ginseng and ice chips. If side effects occur, the drug needs to be reduced and discontinued. The most common side effects are gastrointestinal reactions, such as heartburn, acid reflux, abdominal distension, nausea, and in severe cases, abdominal pain and diarrhea. The most common side effect is allergic reaction, which is mainly manifested as local itching and redness of the skin, and individual patients may even develop rash. This side effect is relatively rare, but if it occurs, it is necessary to reduce the dosage or even stop using the drug.