When oral PDE5 inhibitors (such as sildenafil or tadalafil) provide inadequate response or cause intolerable side effects, established clinical algorithms offer several effective second-line therapies.
Intracavernosal injection (ICI) therapy, utilizing compounded medications such as TriMix (alprostadil, papaverine, and phentolamine), acts directly on penile smooth muscle to stimulate blood flow independently of nerve stimulation.
Other mechanical and medical alternatives include vacuum constriction devices (VCDs) and intraurethral alprostadil pellets. For men with irreversible vascular or structural damage, surgical evaluation for an inflatable penile prosthesis represents a highly effective definitive option.
Risks and limitations
- Injection therapies carry risks such as localized bruising, penile pain, fibrous plaque formation, and priapism (an erection lasting longer than 4 hours), which requires immediate emergency intervention.
- Proper dosing and injection technique must be taught and demonstrated in a clinical setting before home use.