My 9 year old male cat decided to stop using the litter box and has been marking in several rooms. After being cleared for medical issues by our veterinarian, he has been on medication for 6 weeks with very little improvement. I discovered Attraction Action® and added it to the litter boxes as instructed. To my delight, HE USED THE LITTER BOX THE VERY NEXT DAY, all day. Thank you World’s Best!