---
product_id: 254644755
title: "Bayer K9 Advantix II Flea, Tick & Mosquito Prevention for Medium Dogs, 11-20 lbs"
brand: "k9 advantix"
price: "€ 136.21"
currency: EUR
in_stock: true
category: "K9 Advantix"
url: https://www.desertcart.pt/products/254644755-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-medium
store_origin: PT
region: Portugal
---

# For medium dogs 11-20 lbs Waterproof after 24 hours Kills fleas in 12 hours Bayer K9 Advantix II Flea, Tick & Mosquito Prevention for Medium Dogs, 11-20 lbs

**Brand:** k9 advantix
**Price:** € 136.21
**Availability:** ✅ In Stock

## Summary

> 🐾 Protect your pup like a pro — fast, fuss-free, and fearless!

## Quick Answers

- **What is this?** Bayer K9 Advantix II Flea, Tick & Mosquito Prevention for Medium Dogs, 11-20 lbs by k9 advantix
- **How much does it cost?** € 136.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/254644755-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-medium)

## Best For

- k9 advantix enthusiasts

## Why This Product

- Trusted k9 advantix brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No Prescription Needed:** Convenient OTC availability so you never miss a dose
- • **Rapid Flea Elimination:** Kills fleas within 12 hours to stop infestations fast
- • **All-in-One Pest Defense:** Repels and kills fleas, ticks, mosquitoes, biting flies & lice
- • **Waterproof & Fragrance-Free:** Lasts through water exposure with no overpowering scent
- • **Vet-Recommended & Easy Application:** Topical spot-on treatment applied in seconds, no pills or collars

## Overview

K9 Advantix II Medium Dog is a vet-recommended, topical flea, tick, mosquito, biting fly, and lice treatment for dogs 11-20 lbs. It kills fleas within 12 hours and repels pests on contact, preventing bites and infestations. Waterproof after 24 hours and fragrance-free, it offers convenient monthly protection without a prescription.

## Description

K9 Advantix II Medium Dog is the veterinarian-recommended formula that helps defend your dog against five pests: fleas, ticks, mosquitoes, biting flies and lice. And unlike other treatments, K9 Advantix II kills and repels fleas, ticks and mosquitoes. K9 Advantix II topical treatment gets straight to work killing fleas on dogs within 12 hours of initial application. This formula stops existing flea infestations and prevents new ones by killing adult fleas on contact so they can’t lay eggs and they don’t have to bite your dog to die. Fleas, ticks, mosquitoes and other pests not only cause discomfort; they may also transmit disease. Monthly use of K9 Advantix II is important to protect your dog against fleas that may cause transmission of tapeworms. This formula also kills fleas which may cause Flea Allergy Dermatitis and flea bite anemia. That’s why K9 Advantix II Medium Dog topical, spot-on formula makes application simple - going on in seconds. It's easier than a flea collar and there are no hard-to-swallow pills. You’ll also love that K9 Advantix II is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. K9 Advantix II pest protection is effective on both indoor and outdoor dogs. Your dog should be at least 7 weeks old and weigh 11-20 lbs. to use K9 Advantix II Medium Dog. For the ultimate convenience in care, K9 Advantix II is available over the counter – no prescription needed. And, you can stock up with 2-dose, 4-dose and 6-dose packs so you never miss a monthly treatment. Once K9 Advantix II is applied, your dog is ready to get right back to big-pup cuddles and racing around the park. K9 Advantix II Medium Dog is a trademark of Elanco or its affiliates.

## Features

- K9 Advantix II Medium Dog 30-day treatment & prevention protects dogs 11-20 lbs. from fleas, ticks, mosquitoes, biting flies and lice
- Kills fleas within 12 hours of application
- Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die
- Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
- No prescription needed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00I2266Y2 |
| Active Ingredients | Imidacloprid, Permethrin, Pyriproxyfen |
| Age Range Description | Puppy |
| Allergen Information | Allergen-Free |
| Best Sellers Rank | #6,590 in Pet Supplies ( See Top 100 in Pet Supplies ) #11 in Dog Flea Drops |
| Brand Name | K9 Advantix |
| Customer Reviews | 4.3 4.3 out of 5 stars (18,039) |
| Dog Breed Size | Medium |
| Global Trade Identification Number | 00724089060631 |
| Included Components | 2 |
| Item Form | Topical |
| Item Type Name | Topical |
| Item Weight | 0.32 Ounces |
| Manufacturer | K9 Advantix |
| Manufacturer Part Number | 86314991 |
| Model Number | 86314991 |
| Pet Type | Dog |
| Scent Name | Unscented |
| Target Species | Dog |
| UPC | 724089060631 |
| Unit Count | 2.0 Count |
| Volume | 2 Milliliters |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Brand:** K9 Advantix
- **Item form:** Topical
- **Item weight:** 0.32 Ounces
- **Scent:** Unscented

## Images

![Bayer K9 Advantix II Flea, Tick & Mosquito Prevention for Medium Dogs, 11-20 lbs - Image 1](https://m.media-amazon.com/images/I/71VIzeRO-YL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: does this work on mosquitos**
A: Yes! It will keep the fleas off the mosquito. But at the same time, it will kill the mosquito. Use only on dogs from 11-20 lbs.

**Q: Does Amazon assure that these medicines are not expired or tampered?  Is the supplier veterinarian approved?**
A: Yes,  Piccardmeds4pets Corp was created by a Veterinarian Professional, with over 20 years of experience in the field. We have partner with major distributors to bring you not only the best the best prices, but quality and fresh product.

**Q: can i give my dog a bath**
A: Its best to wait a few days before bathing your pet. It gives the medicine time to soak into the skin and do what its designed to do best.

**Q: how long after a bath can I put this on my dog?**
A: Go ahead and put the drops on your dog immediately after bathing.

## Frequently Bought Together

- K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply
- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 2-Mo Supply
- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-09-14*