Learn about sildenafil (Viagra) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. What medications can be prescribed for ED? Some people with ED may benefit from a prescription medication. A healthcare provider can help you decide if medication is right for you. Medications commonly used to treat ED include tadalafil (Cialis), sildenafil (Viagra), vardenafil (Levitra) and Stendra (avanafil). Many men buy erectile dysfunction drugs online for ease and discretion. Before you place your order, it’s best to consult with a urologist. Get erectile dysfunction treatment online at Amazon One Medical. Request prescription for ED pills like sildenafil (Viagra) with 24/7 telehealth care. Find out why drugs you buy on the internet for erectile dysfunction (ED) may have fake ingredients that are harmful or the wrong dosages of real medicine. Viagra and generic Viagra (sildenafil) Viagra is a prescription medication used to treat erectile dysfunction (ED). It has a lower-cost generic version called sildenafil. There are multiple manufacturers of generic Viagra, leading to lower prices. In the U.S., you can legally buy generic Viagra (sildenafil) online, but only with a prescription from a licensed healthcare professional. Sildenafil for erectile dysfunction is not an over‑the‑counter (OTC) medicine in the U.S., so you cannot legally buy it without a prescription. Order from our range of popular and effective ED medications, including Viagra, Viagra Connect, and Cialis. Erectile dysfunction (ED) happens when you cannot get or keep an erection hard enough for sex. Sildenafil (Viagra) may start working within 30 to 60 minutes and last for 4 to 6 hours; tadalafil (Cialis) may start working in about 30 minutes and remain effective for up to 36 hours. With Amazon Pharmacy, you get FREE two-day shipping and select meds start at $1 per month. Prime Members can save up to 80% when paying without insurance.