Actually I have no idea. But I really doubt any drugs will help you, as many other more experienced members might say.
I would not want to be depending on some drug. It would be a lot better for me if I knew that it was my hard work that cured me and made me able to pound my girlfriend for hours...
And wouldn't you finally get immune towards the drug? Like it is with all drugs and medicine, that you need more and more for it to work.
