Viagra is the most recognizable and well-known ED tablet. But plenty of men willingly pay more for Viagra because they like to use the name brand. It’s available in 50 mg, mg, and mg tablets. More harmful side effects tend to be uncommon or rare. Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. By stopping this enzyme, the drug allows better blood flow into the penis, meaning better erections.Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn more about Viagra oral. 1. This is a generic drug. Even if this drug is . An FDA investigation found that more than one-third of “dietary supplements” sold for ED actually contained prescription drugs, including sildenafil, the medicine in Viagra. Some . 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 .