Pharmacy, maybe gas station. It is probably over the counter where you live but might not be. I am not sure exactly why it causes k-pains to go away but in my experience it does. There are two mechanisms of action I can see, one is that it greatly reduces acid in the stomach, which is what it is made for. The second is that is actually inhibits the break down of ketamine into norketamine, so taking this will make it take longer for ketamine in your system to be metabolized, but it also will significantly reduce the by products of ketamine, mainly norketamine, so perhaps it is high concentration norketamine that causes the pain. All I know is that it stopped k pains for me, but I had to keep taking it because they kept coming back for several hours. But yeah, puke, take some of this, drink water.