Action Mechanism
Udenafil is a PDE5-inhibitor, which means it blocks the activity of the PDE5, an enzyme that regulates cyclic guanosine monophosphate (cGMP) level. By inhibiting PDE5 and increases cGMP levels, the drug triggers smooth muscle relaxation, which eventually allows blood to flow into the penile organ, resulting in a stronger and durable erection. Please note that like Viagra, Cialis, or Levitra, Zudena causes an erection only during sexual stimulation.