Erection
Medicines – Medicines in the form of pills that are swallowed such as sildenafil (which is sold as Viagra), tadalafil (Cialis) and vardenafil (Levitra) make the arteries in the corpora cavernosa penis relax, which allows more blood into the penis. There are also other medicines in cream or liquid form that are put into the opening at the tip of the penis, rubbed on the outside of the penis, or injected into the penis using a syringe (a medical tool with a needle at one end that is poked into the body). An example of such a medicine is alprostadil, which also works by making the arteries in the penis become wider.