Safety and Efficacy of Continued CS1 Treatment of Patients With Pulmonary Arterial Hypertension

CS1 delayed release capsules will be supplied with 160 mg active pharmaceutical ingredient (API) per capsule. Three dose levels will be administered in this expanded access study at the same dose the patient received in the parent study (CS1-003) of 480 mg, 960 mg, or 1920 mg. All patients will later have the option to be titrated to the most efficacious and safe dose determined from the ongoing CS1-003 study when completed.