Blood pressure is an important factor in determining whether it is safe for you to use prescription ED medication. To complete your online visit, it is essential that you are accurate and honest about your blood pressure and that it was taken within the last 6 months. When used improperly, these medications can cause serious harm or even death. If you haven’t had your blood pressure taken within the last 6 months, you can get a free blood pressure range at most retail pharmacies or at a clinic.