I have just adopted a semi-feral kitty and I am looking to keep her on a flea preventive. She is already on Revolution but looking for an otc monthly treatment. She is utd on all shots. I also have 3 pups that are on different flea/heartworm meds. I found Blue Bottle Advanced on Amazon and it has great reviews but you can only trust that so much. Blue Bottle's active ingredient is imadacloprid. I was wondering if anyone has used it before. It's a great price if it works and safe for both my new kitty and my two smaller pups. Thanks so much!!