Vidalista 2.5 mg should be taken 1 hour before intercourse or 1 to 4 hours before or as directed by your doctor. It also treats pulmonary hypertension by relaxing the blood vessels in the lungs to allow blood to flow more easily. Tadalafil (PDE-5 inhibitor) is an active salt in Vidalista 2.5 Mg tablets that relaxes the muscles in the blood vessels of the penis and increases blood flow to the penis, therefore, treats erectile dysfunction.