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 sexual intercourse to help achieve and maintain an erection. The number of people who are searching for Viagra online is increasing every year. The best thing that you can do is to visit forums and ask questions that you might have. International Journal of Urology. However, others work on a cash-pay basis and don’t partner with insurance companies., New Lenox Chicago, IL South USA, +8 () Sildenafil Citrate Coupons, Prices, and Savings Card. Brand Names: Revatio, Viagra. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Learn more about sildenafil oral. 1. Sildenafil is used to treat high blood pressure in the lungs (pulmonary hypertension). 1 day ago · Delivery time: 2–5 business days.