Then I discovered the book by Dr. Ignarro, "No More Heart Disease" that prescribes 1 gram of citruline & 5 grams of Argenine as being ideal to reverse heart disease. This indeed lowered my high BP to normal within a few seeks. Side effect for me was teenaged erections for several weeks, that faded away. A small amount of v1agra then added to the mix has been the Final Solution for my Ed. 50 MG daily, but I think 25mg will work just as well. My next order for v1agra will be 25mg pills. v1agra went off of Patent in 2011, so is available at a steep discount in Canada, for as little as 50 cents per 25mg pill.