- allergic reaction to pentoxifylline - ongoing anticoagulation - history of gi bleeding - history of seizures - cardiac or other vascular stents - history of severe renal disease - history of intracranial hemorrhage.

- allergic reaction to pentoxifylline - ongoing anticoagulation - history of gi bleeding - history of seizures - cardiac or other vascular stents - history of severe renal disease - history of intracranial hemorrhage.