Belly shots to prevent blood clots are usually given for about 7 days, but each case has to be analyzed on a case-by-case basis. To observe the changes in coagulation during use, if effective can continue to play, if not, the doctor will switch to other drugs. Belly shots to prevent blood clots generally refer to anticoagulant drugs like low molecular heparin and enoxaparin. The most significant risk of anticoagulant use is that they can cause bleeding, such as localized bruising of the skin, bleeding of the skin’s mucous membranes, and, in more serious cases, hemorrhages, such as bleeding in the brain and stomach. Low molecular heparin or enoxaparin, the half-life of all such drugs is relatively short. If the side effect of bleeding occurs, patients have to stop anticoagulants or use antagonists in time, and the bleeding can be stopped very quickly, so the safety of such drugs is relatively high. In addition, low molecular heparin class of antithrombotic drugs, generally short-term application, duration of no more than 1 week, most patients to transition to oral anticoagulant drugs. Patients who take belly injections to prevent blood clots should follow the doctor’s instructions and regularly check the coagulation function to prevent adverse consequences. Pay attention to the time of use and the injection site, if bleeding occurs, patients should go to the hospital surgery in time.