Trental - Pentoxifylline belongs to the group of medications called vasoactive agents . These medications work by improving blood flow in the arms and legs. Pentoxifylline is used to treat chronic circulation disorders of the arms and legs, such as intermittent claudication (peripheral arterial disease) or ulcers due to poor blood supply. It may allow further distances to be walked before leg pain or cramps occur. It may take up to 2 months to see the full benefits of the medication. Your doctor...