Erections occurs five to 15 minutes after the injection. With practice, the injection procedure is easy to do. It is usually painless, though some men report discomfort following injection. This discomfort is generally mild. As with VCD therapy, the patient has the option to discontinue treatment.
Most dropouts take place in the first month or two.
Injection therapy may have complications or side effects. The most serious is a prolonged erection. This is an erection lasting more than four hours. If a prolonged erection lasts too long, the penis can be injured. The doctor will provide information beforehand on how to seek treatment in case of a prolonged erection.