Ketamine
Cities measured
87
Detected in
84 / 87
Highest
0.009 μg/L — Hanoi
Overview
Ketamine is a dissociative anesthetic used medically and increasingly for treatment-resistant depression (Esketamine/Spravato is EU-approved). It has a dual status as both essential medicine and recreational drug. EMCDDA data show increasing detections in European cities.
Health Relevance
Chronic recreational use causes 'ketamine bladder' — severe cystitis and bladder fibrosis. At environmental concentrations, no pharmacological effect.
Regulatory Limits
Drinking Water Directive 2020/2184
No regulatory limit.
Controversy & Contested Science
WHO added ketamine to its Critical Review list in 2014 as a precursor to potential international scheduling, but ultimately recommended against scheduling — citing its value as an essential anesthetic in low-income countries where no alternative is available. India and China argued strenuously at the UN Commission on Narcotic Drugs that scheduling would deny rural hospitals their only viable anesthetic. The outcome — ketamine remains internationally unscheduled — reflects the tension between recreational harm reduction and essential medicine access in global health governance.