Tadalafil is used to enhance the functionality of exercise in people with pulmonary arterial high blood stress (PAH; high blood strain within the vessels carrying blood to the lungs, inflicting shortness of breath, dizziness, and tiredness). Tadalafil is in a class of drugs known as phosphodiesterase (PDE) inhibitors. It works to deal with erectile disorder with the aid of increasing blood go with flow to the penis throughout sexual stimulation. This increased blood going with the can cause an erection.