Thinking to Buy Sildenafil from my usual Tadalafil was an idea brought up by my friend who has been taking thse drugs for alonger time that I was as he has had ED for about 2 years now and I am just recently diagnosed with it. After the first time I experienced having difficulty in my erection, I immediately contacted my doctor and set up an appointment for a physical exam since I needed to check what was wrong with me. But as it would have it, I was actually quite healthy and they could never figure out what was the possible cause of the ED or erectile dysfunction in my case, they even referred me to a psychologist thinking this might also be a psychological factor which hinders me from getting adequate erection. In there, it was the first time I was prescribed to Buy Tadalafilas this might help me cope up with it for the meantime, and somehow, I was quite glad I could take something for it. But nearly a year later now, I think my body was adapting to the tadalafil as I noticed it was decreasing in its potency, hence my friend suggested the above remedy of alternating it with Viagra or Sildenafil so as not to develop a resistance to either. It worked for him so I guess it is worth a try in my case as I have nothing to lose anyway as I do have ED anyway.