After surgery or radiation, men may have impotence. Treatment for this side effect includes drugs such as sildenafil (Revatio, Viagra), tadalafil ( Cialis), and vardenafil (Levitra, Staxyn). Other treatments include teaching the man to perform a painless self-injection into the penis (of a drug called Caverject), or vacuum pumps. These treatments work in 15% to 40% cases of impotence after surgery and 50% to 75% cases of impotence after radiation. A penile prosthesis is only used when all other options have failed. Adcirca,