• If you are allergic (hypersensitive) to iloprost or any of the other ingredients of Ventavis. • If you are at risk of bleeding – for example, active stomach ulcers, injuries, or other bleeding • If you have a significant suspected build-up of fluid in the lungs, with difficulty in breathing • If your disease is due to a blocked or narrow vein rather than a blocked or narrow artery. • If you have had a stroke within the last 3 months, or any other interruption of blood supply to the brain • If you have a heart problem, for example: