I had been taking Sildenafil Citrate for a few months now after I first discovered I was suffering from erectile dysfunction and what actually sucks is that I am merely 37 years old and still at my peak when this tragedy struck me. I was aware that there are drugs taken for Ed which is good like Sildenafil Citrate or Viagra and this is exactly the first thing I bought after knowing I was suffering from this. I did not even wait to have a prescription given to me by the doctor as I immediately went online and looked for a site where I could buy this and found one in www.generic4u,com and there made my order enough to last me a month initially. But the drawback of what I did was that since I did not have myself checked up, I did not know if I had any allergies of reaction to this drug before I take it and this is what happened as I started having blurry vision thereafter taking it the first week. I literally wasted money on that purchase as after having been seen, I was given Vardenafil which is an entirely different drug from Viagra. This drug was better known as Levitra and now I guess I also learned my lesson that I should always consult with a doctor first about anything as I might waste time and money and effort by not doing so and this is what happened to me.