why not try something natural, like some sex herbs, they work better over time (usually about 2-3weeks at most to get full effect) they make you have more libido and endurance as well, some good ones are- muarana puama, catuaba, tribulus,maca,longjack,yohimbe and horny goat weed these are afew that i like. i buy them in bulk powder mix em together ass some cayenne, and take 2 tablespoons a day , and it keeps me strong in bed, with out all the side effects of prescription drugs. try ebay for bulk herbs.