Patient: Name of drug: Mai Zhi Ling Dosing instructions: 2 tablets, once, taken in the morning, almost two years, no uncomfortable reaction In July 2010, swelling and pain in the left calf appeared, diagnosed by vascular ultrasound as deep vein thrombosis in the lower limbs, and discharged after one week of hospitalization at the Second Hospital of Medical University. Afterwards, the same symptoms appeared in the left thigh, which was treated in the local hospital for two weeks, and the swelling in the thigh subsided but the pain in the groin area kept on, and could not stand for a long time, which was serious in winter. Last year, a deep vein thrombosis in the lower extremity appeared in the right small retreat, which was treated and improved. The inguinal area of the left thigh has been painful, is there any better treatment? Can surgery be done for old deep vein thrombosis? Can deep vein thrombosis in the lower extremity be cured? Qin Jianhui, Department of Peripheral Vascular Surgery, Dongzhimen Hospital, Beijing, China: Old deep vein thrombosis of the lower extremity cannot be treated by surgery. The main treatment for old lower limb DVT is to prevent the recurrence of thrombosis, and the measures are: to go to the vascular surgery department of a tertiary hospital to get medical compression stockings, to move more after wearing medical compression stockings, to avoid sitting and standing for a long time, and to elevate the lower limbs when not moving. Myclobutanil has the effect of reducing swelling, but it has no therapeutic effect on DVT, so if your leg is not swollen, you don’t need to take it for a long time. If the thrombosis in the lower extremity is not completely dissolved when it first occurs, the thrombus will not be completely absorbed once it becomes old, but it can be mechanized and recanalized, that is, the vein can be recanalized, but strictly speaking, it can only be considered as clinical cure, that is, the swelling of the leg can be reduced or significantly reduced, but the structure of the deep vein where the thrombosis occurred may not be restored to its normal form. Therefore, permanent attention should be paid to prevent the recurrence of thrombosis.