Tyvaso is a prescription medicine used in adults for treating pulmonary arterial hypertension, which is high blood pressure in the arteries of the lungs. Tyvaso can improve the exercise ability in people who also take Bosentan or sildenafil. The effect decreases in 4 hours, and the treatment timings can be adjusted for planned activities. Tyvaso is breathed into the lungs through the mouth. You should only take Tyvaso through the Tyvaso inhalation system. Tyvaso lowers the blood pressure in the pulmonary arteries leading to heart from the lungs. Thus, you can exercise in a more productive manner as Tyvaso dilates the arteries and decreases the amount of blood clotting platelets in the body.