Viagra has been out in the market for so long and though it is the primary drug of choice for erectile dysfunction, sadly, it does not work quite as well for me and in fact, I once tried out Online Viagra for me to see if this will be different, but all the same, I get headaches, nausea and some other side effects which makes it really worse for me. So I really wanted another medication to help me cope up with my erectile dysfunction as I knew I had many more years to go of being sexually active before I stop altogether. I was given 2 alternatives by my doctor which was Vardenafil and the other one was Tadalafil , and as I tested out the two, vardenafil worked nicely, but I also had some bit of nausea with it, but with tadalafil, everything was perfect. No side effects, no nausea, no nothing, just good old erection that lasts for up to 4 hours and I can enjoy good sex with my wife anytime we would want to. So having said that, i think it is good that men like me who suffer from impotency have alternatives, not just one medication to rely on as my good example for me. If tadalafil had not been there, I don’t know what else I could have taken to help address this erectile dysfunction thing for me. So I am just thankful for the developers of these medications for ED.