When a man with priapism is brought to the emergency department of a hospital, a doctor will usually try to remove blood from the corpora cavernosa penis by aspirating it (sucking it out) using a syringe. If this is not enough, a chemical called phenylephrine (/"feen-il-eff-rin"/) may be injected into the penis to try and make the blood vessels become narrower. If this also does not work, the doctor will make a shunt (a hole or passage) between the corpora cavernosa penis and corpus spongiosum penis. This allows blood to flow away from the corpora cavernosa penis into the corpus spongiosum penis. For men who have priapism again and again, it has been found that medicines such as sildenafil (Viagra) and tadalafil (Cialis) may help.