Pentoxifylline Tablets 400 MG helps blood arteries to flow more freely. It is used to treat leg pain caused by a lack of blood flow. Pentoxifylline allows you to walk for longer periods of time before needing to rest due to leg cramps. It can only be obtained with a doctor's prescription. It works by making it easier for blood to flow through narrowed arteries. They can be provided by the blood, resulting in increased walking distance and duration.