This is in direct contradiction of the usual consensus among harm reduction practitioners, as explained on erowid:<p>Ketamine and Bladder Health<p>In some cases, chronic ketamine use has been associated with urinary tract symptoms that can include increased frequency of urination, urinary incontinence, pain during urination, passing blood in the urine, and reduced bladder size. In several reported severe cases, surgical intervention to remove the bladder was deemed necessary by clinicians. The wide dose-response range leading to documented cases suggests that individual responses to ketamine may be idiosyncratic and unpredictable, making it unclear what level and frequency of use may lead to urinary problems.<p><a href="https:&#x2F;&#x2F;www.erowid.org&#x2F;chemicals&#x2F;ketamine&#x2F;ketamine_health.shtml" rel="nofollow">https:&#x2F;&#x2F;www.erowid.org&#x2F;chemicals&#x2F;ketamine&#x2F;ketamine_health.sh...</a>