The anal bleeding must come from gayish extra-curricular activities, I use it all the time as a preworkout (Maeng Da strain) and at the recommended dosage, which is about 4-5 grams or a heaping teaspoon it will give you insane focus and a desire to wanna get shit done, thus taking it only on training days. The effect would last about 2-3 hrs depending on the individual and I don't get a crash at all, I think you will start having problems with mega doses as some people have been known to take up to 20 grams of the other strains, which supposedly make you all dopey and opiate-like effects. I still don't understand how some people would take that much, since the shit is pretty expensive, and it has the most disgusting taste, it is like gobbling down a teaspoon of ash(yuck!!).