What is the evidence-based approach to managing feline idiopathic cystitis?

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Accepted Answer

Multimodal environmental modification (MEMO) and therapeutic urinary diets are the only interventions with sufficient evidence to recommend as primary treatment for feline idiopathic cystitis (FIC). All other commonly used therapies — anti-inflammatories, glycosaminoglycans (GAGs), prazosin, amitriptyline, and intravesical lidocaine — lack adequate evidence to support routine use.2 FIC accounts for 54–69% of feline lower urinary tract disease cases and is a diagnosis of exclusion, requiring elimination of urolithiasis, bacterial cystitis, urethral plugs, neoplasia, and anatomical defects before the diagnosis is confirmed.410 Bacterial cystitis is uncommon in cats under 10 years of age, with urinary tract infections identified by culture in approximately 2% of cats presenting with periuria in that age group, making empirical antibiotics inappropriate without a positive culture and susceptibility result.11 MEMO is the cornerstone of long-term management. Cats followed for 10 months under a MEMO protocol showed significant reductions in lower urinary tract signs.3 The stress-FIC link is well established — recognized triggers include indoor lifestyle, dry diet, cohabitation and conflict with other cats, lack of environmental enrichment, and abrupt environmental changes.610 Not all cats require intensive MEMO; the program should be tailored to the individual cat's needs and the owner's capacity to implement changes.3 Dietary modification is the second pillar of management. Therapeutic urinary diets have good evidence for reducing recurrent episodes, and increasing dietary moisture content provides additional benefit — wet food or water supplementation is recommended alongside any prescription urinary diet.2 Diet is the only intervention associated with improved outcome in a prospective randomized trial for FIC.6 Anti-inflammatory drugs, including meloxicam, do not reduce recurrence or accelerate clinical recovery. Meloxicam at 0.1 mg/kg PO on day 1 followed by 0.05 mg/kg