--- product_id: 259707956 title: "Advantage Bayer II Flea Prevention Large Cats, over 9 lbs, 4 doses" brand: "advantage" price: "฿8461" currency: THB in_stock: true reviews_count: 5 category: "Advantage" url: https://www.desertcart.co.th/products/259707956-advantage-bayer-ii-flea-prevention-large-cats-over-9-lbs store_origin: TH region: Thailand --- # Waterproof after 24 hours Protects for 30 days Starts working in 12 hours Advantage Bayer II Flea Prevention Large Cats, over 9 lbs, 4 doses **Brand:** advantage **Price:** ฿8461 **Availability:** ✅ In Stock ## Summary > 🐾 Stay ahead of fleas—because your cat deserves uninterrupted comfort! ## Quick Answers - **What is this?** Advantage Bayer II Flea Prevention Large Cats, over 9 lbs, 4 doses by advantage - **How much does it cost?** ฿8461 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/259707956-advantage-bayer-ii-flea-prevention-large-cats-over-9-lbs) ## Best For - advantage enthusiasts ## Why This Product - Trusted advantage brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Rapid Action Formula:** Kills fleas on contact within 12 hours—no biting needed - • **Month-Long Protection:** One application shields your cat for a full 30 days - • **Effortless Application:** Premeasured, easy-to-use tubes for stress-free monthly treatment - • **Complete Flea Lifecycle Control:** Eliminates eggs, larvae, and adults to break infestations - • **Vet-Recommended & Fragrance-Free:** Trusted by professionals and gentle for your cat’s comfort ## Overview Advantage Bayer II Flea Prevention for Large Cats offers a vet-recommended, fragrance-free topical treatment that kills fleas through contact within 12 hours and protects for 30 days. Designed for cats over 9 lbs, it disrupts the entire flea lifecycle—eggs, larvae, and adults—ensuring comprehensive monthly flea control with easy, premeasured application tubes that become waterproof after 24 hours. ## Description Advantage II Large Cat is a vet-recommended, leading brand in cat flea protection. Advantage II Large Cat flea treatment and prevention kills adult fleas, flea larvae and flea eggs to deliver total flea protection to your cat or kitten. Within 12 hours of application, Advantage II Large Cat topical treatment gets straight to work killing fleas through contact, so they don&x2019;t have to bite your cat to die. This treatment works hard for 30 days following application, effectively breaking the flea life cycle, controlling existing flea infestations and preventing further infestations all month long. Fleas not only cause discomfort; they can also pose other health risks. Monthly use of Advantage II Large Cat is important to protect your cat against fleas that may cause transmission of tapeworms, Flea Allergy Dermatitis and flea bite anemia. That&x2019;s why Advantage II Large Cat makes applying treatment simple. This convenient, spot-on application goes on the back of your cat&x2019;s neck at the base of the skull. You&x2019;ll simply place the tip of the tube on the skin and squeeze the tube to expel the entire contents directly on the skin. It goes on in seconds! It's easier than a flea collar and there are no hard-to-swallow pills. You&x2019;ll also love that Advantage II Large Cat is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. Advantage II Large Cat flea protection is effective on both indoor and outdoor cats. Your cat should be at least 8 weeks old and weigh over 9 lbs. to use Advantage II Large Cat. For the ultimate convenience in care, Advantage II Large Cat is available over the counter &x2013; no prescription needed. And, you can stock up with a subscription for regular doorstep deliveries so you never miss a monthly treatment. Advantage II Large Cat is a trademark of Elanco or its affiliates. Review: Easy to use. Effective. Way cheaper than what I was buying at the vet. Review: It works. Doesn't kill fleas more immobilizes them so you still have to flea comb them. Mostly angry that I could only buy a 4 pack because a 6 pack would take a month to get to me. So I paid more than I should have. ## Features - Easytoapply and premeasured application tubes, fragrancefree and waterproof after 24 hours - Advantage II flea prevention for cats kills fleas through contact, meaning fleas don’t have to bite your cat in order to die - 4month supply of advantage II cat flea treatment for cats 9 pounds and over - Vet recommended, fragrance free and designed specifically to treat and prevent fleas on cats - Starts working within 12 hours and protects your cat for up to 30 days. Kills fleas in multiple life stages; Eggs, larvae and adults to break the flea life cycle ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004QN0MJQ | | Active Ingredients | Imidacloprid, Pyriproxyfen | | Age Range Description | Adult | | Brand Name | Advantage | | Customer Reviews | 4.5 4.5 out of 5 stars (12,894) | | Global Trade Identification Number | 00724089202246 | | Item Form | Topical | | Item Weight | 0.05 Pounds | | Manufacturer | Bayer | | Manufacturer Part Number | 81520224 | | Model Number | 86336790 | | Scent Name | fragrance_free | | Target Species | Cat | | UPC | 727516696311 724089378774 643996929094 724089616852 724089202246 024089616853 788995790068 891962001323 | | Unit Count | 4 Count | | Volume | 3.2 Milliliters | ## Product Details - **Active Ingredients:** Imidacloprid, Pyriproxyfen - **Brand:** Advantage - **Item form:** Topical - **Item weight:** 23 g - **Scent:** fragrance_free ## Images ![Advantage Bayer II Flea Prevention Large Cats, over 9 lbs, 4 doses - Image 1](https://m.media-amazon.com/images/I/71aB0uvCewL.jpg) ## Questions & Answers **Q: Why is the item called "Bayer K9 Advantix II Flea and Tick Control Treatment for Cats"? The Bayer K9 is, of course, for dogs.** A: Please be sure to use ONLY Feline Advantage on cats and use ONLY the dog Advantage on dogs! The use of canine Advantage on cats WILL kill them giving them severe neurological damage! I wish that Advantage would make the packaging TOTALLY different for cats and dogs, it would help. Especially with people who may not see the difference at first glance. My elderly mom accidentally applied the large dog Advantage to her cat and it had to be put down. Mom has felt horrible about it. Awful experience. Also about dosing, I have a 19 year old cat and I have used feline Advantage on him every summer for about 3 months for well over 17 years. It works wonderfully for him. I have always used the large cat product but since he has lost some weight this year I called Bayer and asked if I should use a smaller dose. The person at Bayer explained that Advantage works on body AREA as well as weight. So even though my cat has lost some weight (he's 9 pounds) his body AREA is still the same (loose skin) and so I have been applying the large cat dose and it has worked well for him this summer with no ill effects. I cannot speak to the authenticity of this Amazon product as I purchase my Advantage from the local pet store. **Q: When using this medicine, do I also need to flea bomb or spray the apartment ? Or will the medicine kill all fleas in the apartment, as well?** A: You'll find a wide range of advice on here. I can only tell you what has worked for me on several occasions. This topical treatment will kill only the fleas that get on your cat. There are several options for your home. They range from safe/natural formulas to strong pesticides. The all safe/natural offerings work for a short time and only kill the fleas that come in contact with the spray. I keep a bottle outside to spray on my feet and ankles to kill the fleas from outside that have hopped on me while in the yard. Great for this and for bedding. Next, as for bombs - there is only one that I have found that works. Most bombs are cans of spray that has a button that locks down to empty the can of spray. They may work but only cover a very small area effectively. Raid makes a bomb that you drop into a supplied plastic cup with about an inch of water in it. When the bomb canister hits the water, it will begin to smoke. The smokenfills the entire area. Three cannisters come in the box and can cover a small house effectively, every nook and cranny. It is called Raid Fumigator. I have NEVER had to use it twice. This type of treatment requires you to remove ALL pets for about 6 hours, but it does work. Raid also makes a carpet spray that works well. But again, pets must not be around it until the fumes die down - about 30-40 minutes. Two other options are Boric Acid or diotemaceus earth (food grade!). These two products are applied similarly. You sprinkle them on carpet or furniture and take broom or brush to rub them in. This will take a few days to a week or so to get control of a home invasion. They work by cutting the exo-skeleton of fleas, roaches, etc and cause them to dehydrate. The Boric Acid can cause irritation to some pets or people, where the diotemac ous earth is 100% safe other than breathing the fine dust that occurs only when you are applying it. Both work great! The problem with a lot of people complaining that a product doesn't work is that they don't realize that the flea you see is only 5% of what is in your house. The other 95% are eggs (laid about 50 at a time) and the larvae. There is a cycle that last up to several weeks. When these doubters kill the 5% adult fleas and then find more fleas a few days later, they think it doesn't work. But in reality, they are see new hatchlings. That's where the Boric Acid and Diotemaceus earth come in handy if you can't use the Fumigator. An infested home can seem unsurmountable but try the products that you feel safe with, give it time and vacuum everyday you can and you will win! **Q: Is this 6 month supply a 6 pack of tubes?** A: Hi Doreen... Actually, I bought the 4 pack because I have four cats. I had earlier in the month bought a 4 pack someplace else, so I had two treatments for each cat. I did the treatments three weeks apart (the instructions say it is OK to do if you wait seven days). I bought the 9+ lb. package as three of the cats are well over that weight. One cat is a bit smaller and I didn't use quite all of the tube on her. None of the cats had any bad reactions, and it worked well for three of them. The other cat (partial Maine Coon) had some results, but not so good. **Q: Does this kill ticks? If not, what do people recommend for ticks?** A: To get rid of fleas and ticks use Frontline Plus. I started to use it on mine a year ago it killed the ticks and fleas. I reapply it every other month and I haven’t seen one since. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by S***H on 5 April 2026* Easy to use. Effective. Way cheaper than what I was buying at the vet. ### ⭐⭐⭐ Review *by J***D on 20 March 2026* It works. Doesn't kill fleas more immobilizes them so you still have to flea comb them. Mostly angry that I could only buy a 4 pack because a 6 pack would take a month to get to me. So I paid more than I should have. ### ⭐⭐⭐⭐⭐ Review *by D***C on 3 April 2026* I try different brands and styles of flea and tick products to find the best ones for my fur babies. This one works really well as long as you aren’t taking your fur babies out of town. It’s best used within city limits, at city parks and at home in the backyard. ## Frequently Bought Together - Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 4-Month Supply - Advantage II Small Cat Vet-Recommended Flea Treatment & Prevention | Cats 5-9 lbs. | 4-Month Supply - K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 4-Mo Supply --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.th/products/259707956-advantage-bayer-ii-flea-prevention-large-cats-over-9-lbs](https://www.desertcart.co.th/products/259707956-advantage-bayer-ii-flea-prevention-large-cats-over-9-lbs) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-22*