Ketamine causes Ulcers in high habitual dosing. There is little information on this on the internet but if you search just hard enough you will hear rumors of it. Well why isn't this a known fact? Well one would have to take ketamine daily or semi daily at least to get this nasty side effect. swirx was unfortunate enough to have this happen on 3 separate occasions. The first time on a cruise ship, resulting in him collapsing on deck screaming for his life, which resulted in a diagnosis of 'gastritis' and a double shot of morphine. The second time at home which kept him pent in bed in the fetal position a few days. The third time in the snow in the midst of a rock scramble/ice climb, which made for a difficult, cold, and dire crawl two miles to safety. From communication with 3 other habitual ketamine abusers this phenomena was familiar with all 3 and equally as gruesome. For the record all 3 consumed a minimum of 3-5 grams a week often more. Now the physiology of it seems to be a disruption in the pH of the gall bladder causing an ungodly acid reflux. (literally feels like the acids going to eat clear through to swiys skin) The way to end the agony is stop using ketamine till it subsides. It can take up to 3 days for it to go away with abstinence. Pink Bismuth(pepto bismol) was found to alleviate some of the pain, as did pain killers. Thought swirx would share as it took him nearly a year to figure it out, and found next to no information on the net about it.