Question: what are the pde5 inhibitors?
Answer: Phosphodiesterase 5 (PDE5) is an enzyme that affects cell signaling. Inhibiting PDE5 can relax muscles and increase blood flow to specific areas of the body, which is why PDE5 inhibitors such as tadalafil (Cialis™), sildenafil (Viagra™), and vardenafil (Levitra™) are primarily used to treat erectile dysfunction in men.