Vasodilators, another type that relaxes pulmonary arteries and lowers the pressure, another that widens blood vessels alled endothelin receptor antagonists reverse the effect of a substance in the walls of blood vessels that causes them to narrow, erectile dysfunction meds (believe it or not which started out as cardiac medications) which help to increase blood flow through the lungs, calcium channel blockers, blood thinners,
digoxin, diuretics and oxygen therapy.