ADCIRCA is a prescription medication primarily used for the treatment of pulmonary arterial hypertension (PAH), a condition characterized by high blood pressure in the arteries that supply blood to the lungs. This medication works by relaxing blood vessels in the lungs, which allows blood to flow more easily, thereby reducing the workload on the heart and improving the ability to exercise. ADCIRCA contains the active ingredient tadalafil, which is also used to treat erectile dysfunction, though when prescribed for PAH, the focus is on its ability to improve exercise capacity and delay clinical worsening of the condition. It is important for patients to follow their healthcare provider's instructions closely when taking ADCIRCA, as it can interact with other medications and may not be suitable for individuals with certain health conditions.