As suggested I did go back and checked about the information my physician gave me. I did make a huge mistake when I wrote what he had told me. What he told me was that the efficacy of daily dose Truvada is equal to taking a single dose for 2 days before intended sexual activity followed by a single dose for one or two days after sexual activity takes place. I for some reason write that a single dose for two days before was sufficient and equal in efficacy. That was a very serious misquote and I am sorry for it.
As with any other medical information you receive here, you should speak with your physician before changing your behavior or regimen, particularly regarding HIV. My purpose was simply to provide information that was different than that usually provided and that that I did not know about. Moreover, it was from a person who I believed was a competent source. My doctor has worked with HIV/AIDS patients in a large city for the last 30 years or more. But PLEASE consult with your physician prior to any change in your regimen.