Popular ED medications found online include: Viagra (sildenafil): As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before .Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Payment options: Consider how you’d like to pay. And not all online pharmacies have the capability to safely ship medications that need to be temperature-controlled, such as insulin. This allows the smooth muscles in the penis to relax and fill with blood. You can see an in-person provider or speak with a doctor virtually. If approved, the provider will issue a prescription. 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.While many sites sell drugs online illegally, one company called KwikMed offers consumers the option of buying certain medications—the erectile Missing: script. Popular ED medications found online include: Viagra (sildenafil): As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before .More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. Drug interactions Finding the best treatment for erectile dysfunction means prioritizing your safety. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. Need help locating one? It’s available in 10 mg and 20 mg tablets.