I recently used a viapro capsule while I was in Carlisle. I had 2 so I gave one to the client as well. They have 375mg in them. This is a herbal supplement and is meant to work within 30 minutes, but we felt a difference within 15 minutes. It doesn't have sildenafil in it, with the main ingredient being similax extract (sarsparilla). It is supposed to work up to 24 hours afterwards. For me there was a definite reaction and a very good one at that. It certainly didn't stop the client from coming either, as he managed 3 times over the 3 hours and they seemed to be more powerful from what he told me.
I have since checked this out on the net. Funnily enough I did see kamagra, but it looked like it had been discontinued and replaced. Viapro is readily available on ebay.
I did get a headache the next day and felt a bit stuffy, but this could have coincided with the place I was staying at being God awful, with too hot heating, not enough fresh air coming into the room and the constant humming of generators near by. I'd have to try it again to be sure if it was caused by the capsule.