Dataset from An Extension Study to Evaluate the Long-Term Safety and Efficacy of the Phosphodiesterase Type 5 (PDE5) Inhibitor Tadalafil in the Treatment of Patients With Pulmonary Arterial Hypertension

Study to determine the long term safety of tadalafil in patients with increased blood pressure in the blood vessel that carries blood from the right heart to the lungs and to see if it will keep the disease from getting worse.