--- product_id: 457282504 title: "Bayer K9 Advantix II (11-20 lbs) 6-doses" brand: "bayer animal health" price: "1214 zł" currency: PLN in_stock: true reviews_count: 5 category: "Bayer Animal Health" url: https://www.desertcart.pl/products/457282504-bayer-k9-advantix-ii-11-20-lbs-6-doses store_origin: PL region: Poland --- # Kills fleas in 12 hours 6-month supply in one pack Protects up to 4 weeks Bayer K9 Advantix II (11-20 lbs) 6-doses **Brand:** bayer animal health **Price:** 1214 zł **Availability:** ✅ In Stock ## Summary > 🐾 Stay ahead of pests, keep your pup happy and itch-free! ## Quick Answers - **What is this?** Bayer K9 Advantix II (11-20 lbs) 6-doses by bayer animal health - **How much does it cost?** 1214 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/457282504-bayer-k9-advantix-ii-11-20-lbs-6-doses) ## Best For - bayer animal health enthusiasts ## Why This Product - Trusted bayer animal health brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Month-Long Protection:** Keeps your dog flea and tick-free for up to 4 weeks per dose - • **Rapid Flea Elimination:** Kills fleas within 12 hours to stop discomfort fast - • **Water-Resistant Formula:** Continues working even after your dog gets wet - • **Value-Packed Convenience:** 6 easy-apply doses for a full 6-month treatment cycle - • **Complete Parasite Defense:** Repels mosquitoes, biting flies, and kills lice too ## Overview Bayer K9 Advantix II is a powerful topical treatment designed for adult dogs weighing 11-20 lbs. It kills fleas within 12 hours and protects against fleas, ticks, lice, mosquitoes, and biting flies for up to 4 weeks per dose. The formula includes imidacloprid, permethrin, and pyriproxyfen, which disrupt flea growth and provide water-resistant protection. This 6-dose pack offers a convenient 6-month supply, ensuring your dog stays pest-free and comfortable. ## Description Bayer K9 Advantix II is a long-lasting, topical flea treatment that kills fleas within 12 hours and protects your dog from re-infestation for up to 4 weeks. It is a new and enhanced formula, with added insect growth regulators (IGR) that kill fleas, ticks and lice, as well as repelling mosquitoes and biting flies. Advantix II contains imidacloprid, permethrin and pyriproxyfen that work together to kill eggs and larvae and inhibit flea growth. Continues working even after your dog gets wet. Includes 6 monthly, easy-squeeze tube applications. Use only on dogs 7 weeks and older. Review: I changed from another brand, because it was not very effective in getting rid of fleas, making my dog miserable. Since switching to Bayer K9 Advantix II I no longer have this problem, It not only kills the live fleas, but also the flea larvae, plus it helps to repel mosquitoes and flies. My dog is a lot happier too! Review: This exact same package goes usually 40 to 50% more expensive when purchasing it from the local vet's office here. I don't know if the prices are similar elsewhere but for us this was a no-brainer. We compared the first package we bought from the vet and this is the exact same product, only cheaper by far. It works great too! Our dog loves it as well! At least he loves the lack of fleas. LOL ## Features - flea & tick topical treatment - adult dogs 11 lb - 20 lb - 6 doses = 6 month treatment ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004UMOJII | | Active Ingredients | Pyriproxyfen | | Age Range Description | Adult | | Brand Name | Bayer Animal Health | | Customer Reviews | 4.6 4.6 out of 5 stars (125) | | Item Form | Drops | | Item Weight | 0.04 Pounds | | Manufacturer | Bayer | | Manufacturer Part Number | 724089616180 | | Scent Name | Unscented | | Target Species | Fish | | UPC | 724089616180 | | Volume | 12 Milliliters | ## Product Details - **Active Ingredients:** Pyriproxyfen - **Brand:** Bayer Animal Health - **Item form:** Drops - **Item weight:** 0.04 Pounds - **Scent:** Unscented ## Images ![Bayer K9 Advantix II (11-20 lbs) 6-doses - Image 1](https://m.media-amazon.com/images/I/71Ku3Q4IlfL.jpg) ## Questions & Answers **Q: The headline says this is a 6 pack but the description at bottom says 4 pack. Which is correct?** A: This is a 6 pack. I don't see 4 pack anywhere on the bottom of my screen when I look on this listing. Maybe I'm missing it? It is definitely a 6 pack in the heading, and the picture. Also, on my listing, my descriptions further clarifies it for the customer by reading "I am a licensed veterinarian and I guarantee this product is purchased directly from Bayer. This is the NEWEST Version of authentic Advantix II, 6-month supply. It is USA EPA Approved and does not expire..." I hope this helps. **Q: What's the expiration date on the in stock supply? Thanks!** A: These don't have expiration dates. Once you open the tube it's 30 days. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by R***D on 30 October 2013* I changed from another brand, because it was not very effective in getting rid of fleas, making my dog miserable. Since switching to Bayer K9 Advantix II I no longer have this problem, It not only kills the live fleas, but also the flea larvae, plus it helps to repel mosquitoes and flies. My dog is a lot happier too! ### ⭐⭐⭐⭐⭐ Review *by W***Y on 11 February 2014* This exact same package goes usually 40 to 50% more expensive when purchasing it from the local vet's office here. I don't know if the prices are similar elsewhere but for us this was a no-brainer. We compared the first package we bought from the vet and this is the exact same product, only cheaper by far. It works great too! Our dog loves it as well! At least he loves the lack of fleas. LOL ### ⭐⭐⭐⭐⭐ Review *by B***L on 9 September 2020* I have used this flea and tick product for years, and this was a great price and a large enough package to last me a few months. I have 2 dogs that I use it on. --- ## 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.pl/products/457282504-bayer-k9-advantix-ii-11-20-lbs-6-doses](https://www.desertcart.pl/products/457282504-bayer-k9-advantix-ii-11-20-lbs-6-doses) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-06-02*