Online ED consultations offer privacy, convenience, and affordability while allowing you to quickly get the medications you need—the same day, with some services. Read our editorial process. Finding an online ED provider can feel overwhelming. An erection results from an increase in blood flow to the penis. Payment options: Consider how you’d like to pay. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction.GoodRx can help you save over 80% off the average retail price of the generic versions. Generic sildenafil at certain pharmacies is as low as $ with a free GoodRx discount. You can also find generic tadalafil and vardenafil for as low as $ and $ , respectively. Lemonaid can prescribe sildenafil (generic Viagra), tadalafil (generic Cialis), and vardenafil (generic Levitra). You can get a prescription online following a quick and easy visit with a member of our clinical team. You can buy it under its generic name or under the brand names Levitra and Staxyn. Vardenafil is FDA approved to treat erectile dysfunction (ED). It works by allowing more blood to flow to.