FELIWAY Classic Cat Calming Pheromone, 30 Day Refill - 6 Pack · Vet Recommended and #1 selling solution: FELIWAY Classic helps cats adjust to challenging situations, and curbs stress related unwanted behaviors such as spraying, peeing, scratching, and general fearfulness · Reduces urine spraying in 9 out of 10 cats · FELIWAY Classic is a drug free solution that mimics cat’s natural facial pheromones, which may help your pet feel calmer in common stressful situations · FELIWAY Classic Refill covers up to 700 square feet; for the best results position the diffuser where your cat spends most of his or her time, and avoid plugging the diffuser in under shelves and behind doors, curtains, or furniture · This product includes 6 refills that each last for up to 1 month (diffuser not included); to maximize effectiveness replace the refill once a month and the diffuser every 6 months