Here is some information you might find helpful. There is an article here about Caverject, the side effects, dosage information and drug and other common interactions. There is also an article written by Dr Justin Harmon that explains how penile implants and drugs like Caverject work.
Make sure you consult your doctor with any questions you have. Hopefully you will find something here that will help you ask those questions.
Take care!Vicki M