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Zero re-obstructions sounds almost too good to be true, so we wanted to understand exactly how the data got there and what it means for everyday feline practice. We are joined by study author Dr. Kelly Tart to talk about a prospective, double-blinded, placebo-controlled trial evaluating lorazepam for recurrence prevention after feline urethral obstruction in male cats, one of the most common and life-threatening urinary emergencies we treat.

We start with the “why”: feline urethral obstruction can rapidly cause azotemia, hyperkalemia, acidosis, and fatal arrhythmias, and recurrence often hits within the first couple of weeks after discharge. Kelly explains the key anatomic detail that drives the whole hypothesis: the male feline penile urethra contains both smooth and skeletal muscle, and plugs often lodge distally where skeletal muscle dominates. Many past pharmacologic approaches have focused on smooth muscle pathways, which may help explain inconsistent results in recurrence studies. Lorazepam, a benzodiazepine with skeletal muscle relaxant effects, offers a mechanism that better matches where the problem happens.

We also dig into what strong evidence looks like in veterinary medicine and why prospective enrollment, standardized care, placebo control, and double blinding matter when owners and clinicians are judging outcomes in nonverbal patients. You will hear practical discharge details including timing, dosing approach, a 30-day course to cover the highest-risk window, approximate cost, and what adverse effects to monitor such as sedation and ataxia. We close with the clinical “so what”: how this could change post-obstruction management, which cats we would avoid based on prior benzodiazepine sensitivity, and the research questions this opens for lower urinary tract signs beyond true obstruction.

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JAVMA article: https://doi.org/10.2460/javma.26.01.0045

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