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Introduction: The use of ketamine as a recreational drug is on the increase among young adults attending clubs and parties. Recreational ketamine users have anecdotally reported increased lower urinary tract symptoms while using the substance., Methods: We describe the severe lower urinary tract symptoms experienced in 6 patients with chronic recreational ketamine use. We obtained a detailed history and physical examination along with further investigation to identify a relationship between recreational ketamine use and these symptoms., Results: The urine cultures were sterile in all cases. Intravenous urography was performed in 3 patients and demonstrated bilateral upper ureteric narrow, mild bilateral hydronephrosis and contracted bladder urodynamic studies showed detrusor instability with urinary leakage when the bladder was filled to a capacity of 30- 50 ml. Cystoscopy revealed a small capacity bladder with erythematous lesions throughout the bladder. Bladder biopsies were performed in 3 patients and showed up as chronic cystitis. Ketamine cessation along with intravesical sodium hyaluronate solution appeared to provide some symptomatic relief., Conclusion: Ketamine-associated urinary tract dysfunction appears to be a relatively new clinical phenomenon. The pathological mechanism of ketamine-associated urinary tract dysfunction is unknown and current management strategies are ketamine cessation along with intravesical sodium hyaluronate solution., (Copyright © 2012 S. Karger AG, Basel.)