Displaying 25 results of Riociguat Impurities Riociguat is a medication used to treat pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension. Riociguat impurities refer to any unwanted substances or byproducts that may be present in the medication. It is important to monitor and control the levels of these impurities to ensure the safety and efficacy of the medication for patients. Analytical methods such as high-performance liquid chromatography (HPLC) can be used to detect and quantify these impurities.