Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. Erectile dysfunction can be caused by a variety of factors , including age, cardiovascular problems, diabetes, and other conditions that affect nerve function or blood flow. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial. Generic versions of sildenafil, vardenafil and tadalafil are available. You can take it in a small dose daily or in a larger dose as needed.CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing . 1 Choose your meds Sildenafil, tadalafil, Cialis Daily, and more. 2 Answer health questions Including your blood pressure reading. 3 Medical team review Some states require a . According to price-comparison site , generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with .