HI, How are you? My name is Dr Suresh Raghavaiah. I am a Liver transplant surgeon and I hope to answer your question today. I am sorry to hear about your problem. Leg edema is a frequent complication of liver failure. It is due to low protein levels and combined with varicose veins, can be very troublesome. Since you are already on diuretic therapy, I would advise you to wear compression stockings which are usually available in any drug store. In addition to this, please make sure to keep exercising your ankles while sitting on the flight and also to take frequent walks along the length of the plane during the flight. Although Venoruton is usually used to treat varicose veins, I am not sure it will be of much help to prevent swelling during the flight. Hope this helps and hope you feel better. Please do not hesitate to write back for further clarifications. Dr Suresh Raghavaiah