Penile injection therapy involves injecting medication into the penis to induce erection. Common medications include Trimix, Bimix, and prostaglandin, which work by stimulating blood flow and relaxing penile muscles. The injection takes 5-10 minutes to induce an erection lasting 30-60 minutes. This treatment is effective even with nerve damage. To perform the injection, one must prepare the medication and penis before delivering the injection. There is a risk of prolonged erection (priapism) which can damage the penis if lasting over 4 hours, so one should not exceed the prescribed dose or combine with other ED medications. If priapism lasts over 2 hours, Sudafed should be taken, and medical