Medically reviewed by. Viagra is the most widely counterfeited drug on the market. Before you use it for the first time, a doctor or nurse will need to explain in person how to use it. It’s best to check your chosen provider’s site for more information. Which erectile dysfunction pills are best?Read on to learn where to buy Viagra and sildenafil online — plus, more about how Viagra works, its alternatives, and how it compares with other ED medications. Compare prescription drug prices and find coupons at more than 70, US pharmacies. Save up to 80% instantly! Erectile Dysfunction. 97% average discount. Erectile . Our average rating based on reviews. Express shipping US clinicians Get your treatment We’ll deliver to you in days Here’s what’s included in the price: Free .