I don't want to encourage anyone to use psychedelic drugs, or any other potentially harmful or addicting chemicals, especially alcohol (this is my disclaimer). I've used Ket a number of times, not really to have fun (although it was sooo pleasurable), but more to get to the place of disassociation, and to turn off my DMN loops and ruminations that were still lingering after a couple of years of dealing with and recovering from severe PTSD. I was careful to take some time away from doing Ket again, about two weeks before doing another trip. I new that if I did it too often, I could get to like it a little too much. Also, I didn't want to build up a tolerance. The day after my first trip, my kidneys and my bladder ached a bit, it felt a little like a slight kidney/bladder infection. Not real bad, just achy. A friend told me that it was important to "flush out" while starting to come down. Reason being, whatever the metabolized byproducts were from using Ket, they needed to be diluted and flushed out of your body, especially your kidneys and bladder. He said that's why I felt the symptoms that I did and it made sense to me. So each of the other times, while I was coming down, I either drank lots of water, or lots of "light" beer, or a combination of both and flushed it all out of my bladder and down the drain. I never had any pain, or symptoms again. Last time I used it was about 8 months ago, haven't needed to use Ket since...