In some cases, online ED providers accept health insurance. Finding an online ED provider can feel overwhelming. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Erectile dysfunction medications require a prescription from a licensed provider. Methodology We researched 19 online platforms for erectile dysfunction treatment to learn more about the process of ordering ED pills online.Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision.