I think I now know why these ED drugs are a sure hit, it was unexpected but i came across a research which found out that 2 in every 10 men at age 38 plus will start experiencing difficulty in maintaining erection and impotency is really a problem which I predominant starting these ages. Ever since the famous Sildenafil or Viagra came out and with its big success in the market, there have been lots of pharmaceutical that took on the bandwagon and started to develop their own drugs like Tadalafil, Cialis, and even the new and supposedly better anti-impotency drug known as Vardenafil or better known as Levitra. And they all have made so much success in terms of sales and advertising. But the downside of it is that since it is easy to buy, there have been lots of fake ones that have also come out and believe me, these are dangerous drugs that have come out in imitation of these famous drugs. I even got a friend who was hospitalized for renal failure after taking 2 doses of Viagra he bought online, turns out it was fake and an expired kind of other medication for heart conditions. With all these abound, you better check what you buy especially if it is online and in there, go to trusted sites like www.genric4u.com, where you are sure to be able to purchase the right and true medications for erectile dysfunction and the likes.