Generally the side effects of targeted drugs are likely to disappear slowly after stopping the drug for half a month, but in some cases they may not disappear, and the use of targeted drugs needs to be guided by a professional physician. Depending on the type and kind of targeted drugs, the side effects are not the same after using the drugs, and the duration of the side effects is also different. Generally, the side effects will disappear after half a month of stopping taking the targeted drug. The side effects of targeted drugs include allergy, high blood pressure, myocardial ischemia, myocardial infarction, diarrhea, nausea, vomiting, skin edema, loss of appetite, thrombocytopenia and so on. If the targeted drug causes serious side effects to the body, you need to stop taking the targeted drug or change to another type of targeted drug. If the side effects do not disappear for a long time after stopping the drug, the patient needs to go to a regular hospital in time. Taking targeted drugs should be guided by a professional doctor, do not take drugs on your own.