Caverject and Viridal Duo are the injections currently available.

It involves putting a very fine needle into the side of the penis (the shaft) and injecting a measured amount of the drug. It is important to start with a small amount of the drug and gradually increase the dose to get an erection to last as long as needed. Usually an hour is long enough and no longer than 4 hours!
(See PRIAPISM).

Injection Therapy