What oral medication is needed for swollen feet in the elderly also depends on the specific cause of the swollen feet. If the cause is of cardiac origin, such as hypertension, angina pectoris, myocardial infarction, coronary artery disease, heart failure, etc. Blood pressure control, cardiotonic, diuretic and vasodilator drugs should be given for treatment. If the swelling of the feet is caused by nephrogenic causes, protein intake should be restricted and renal preservation therapy should be given. Patients with severe acute and chronic renal failure also need peritoneal dialysis or hemodialysis. For hepatogenic swelling, liver protection and hepatoprotective therapy should be given first. Patients with cirrhosis who have significant hypoproteinemia also need to be treated with human albumin infusion and small doses of diuretic drugs. For swelling due to hypothyroidism, further oral administration of levothyroxine sodium tablets is required to maintain normal thyroid function. If the swelling is caused by venous reflux disorders in the lower extremities, prolonged standing and sitting should be avoided, the affected extremities should be elevated appropriately, and elastic stockings can be considered to relieve the symptoms.