Stendra is used to treat male sexual function problems that is impotence or erectile dysfunction-ED. Stendra does not protect against sexually transmitted diseases such as HIV, hepatitis B, gonorrhea, syphilis. To decrease your risk of infection, always use an effective barrier method latex or polyurethane condom and dental dams during all sexual activity. Consult your doctor or pharmacist for more details. Depending on your dose, take avanafil about 15 minutes or 30 minutes before sexual activity.