Used primarily in the treatment of pulmonary arterial hypertension (PAH), this compound helps to reduce high blood pressure in the lungs by dilating blood vessels and improving the ability to exercise. It is administered through intravenous or subcutaneous infusion, and also available in inhaled and oral forms. The drug slows the progression of symptoms and enhances quality of life in patients with PAH. It is often prescribed for long-term management in adults and sometimes in children with the condition.