Treating high blood pressure in the lungs (pulmonary arterial hypertension [PAH]) in certain patients. Letairis is an endothelin receptor antagonist. It works by blocking a certain substance in the lungs, which helps to decrease blood pressure in the lungs.
Letaris medicine belongs to the class of drugs known as endothelin receptor antagonist. Letaris is the brand name and its generic name is Ambrisentan. The medicine is used in the treatment of pulmonary arterial hypertension. This is a condition where there is high blood pressure in the lungs and heart.