Used primarily in the treatment of pulmonary arterial hypertension (PAH), this compound helps to reduce the strain on the heart and improve exercise capacity. It works by relaxing the blood vessels in the lungs, allowing blood to flow more easily. This leads to improved symptoms such as shortness of breath and fatigue, enhancing the patient's quality of life. It is taken orally and is designed for long-term management of the condition. Not intended for acute symptom relief, it is part of a broader treatment plan for chronic pulmonary vascular disease.