After the occurrence of phlebitis, you can use drugs such as Xiliao Tou or sodium heparin ointment, both drugs can reduce local pain and promote the absorption of vasculitis, you can also use magnesium sulphate local wet compress, but there is no which of these ways is better, the effect is basically similar. If you can not find drugs and magnesium sulfate, you can also use local hot compresses to promote the absorption of thrombus. However, if the thrombus continues to spread upward when medication is used after phlebitis, anticoagulants are sometimes needed to prevent the thrombus from spreading upward into the deep veins, causing deep vein thrombosis and leading to pulmonary embolism.