Weakness of the right leg caused by compression of nerve by cerebral edema can be treated by dehydration therapy, nerve nutrition and rehabilitation training. 1. Dehydration treatment: the first step is to dehydrate the nerve compressed by cerebral edema, so as to relieve the compression symptoms. The speed of dehydration treatment should not be too fast, otherwise it may cause brain hernia, which is fatal. The commonly used drug for dehydration is mannitol. Intravenous application of mannitol injection can effectively eliminate cerebral edema. 2. Nutritional nerve: after eliminating cerebral edema, it is necessary to take the means of nutritional nerve to treat, commonly used drugs are methylcobalamin, etc., and the more serious symptoms can choose the intravenous preparation. 3. Rehabilitation training: After eliminating the edema and nutritive treatment, the above symptoms can be improved significantly. If the symptoms of leg weakness still remain, rehabilitation training can be adopted, including exercise training and physical therapy. If the symptoms of right leg weakness caused by cerebral edema compression of nerves occur, you should go to the hospital in time. Medications should all be used under the guidance of a doctor.