---
product_id: 274232884
title: "Bayer II Flea and Lice Treatment for Medium Dogs, 11-20 lb, 4 doses"
brand: "advantage"
price: "675 Lei"
currency: RON
in_stock: true
reviews_count: 5
category: "Advantage"
url: https://www.desertcart.ro/products/274232884-bayer-ii-flea-and-lice-treatment-for-medium-dogs-11
store_origin: RO
region: Romania
---

# Waterproof after 24 hours Kills fleas within 12 hours 30-day continuous protection Bayer II Flea and Lice Treatment for Medium Dogs, 11-20 lb, 4 doses

**Brand:** advantage
**Price:** 675 Lei
**Availability:** ✅ In Stock

## Summary

> 🐾 Stay ahead of fleas—because your dog deserves the best defense!

## Quick Answers

- **What is this?** Bayer II Flea and Lice Treatment for Medium Dogs, 11-20 lb, 4 doses by advantage
- **How much does it cost?** 675 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/274232884-bayer-ii-flea-and-lice-treatment-for-medium-dogs-11)

## 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

- • **Month-Long Defense:** Breaks the flea life cycle with a single monthly application for uninterrupted protection.
- • **Effortless Application:** Topical spot-on formula applies in seconds—no pills, no collars, no hassle.
- • **Rapid Flea Elimination:** Starts killing fleas on contact within 12 hours—no biting needed.
- • **Vet-Recommended & Trusted:** Clinically proven and recommended by vets for medium dogs 11-20 lbs.
- • **Fragrance-Free & Waterproof:** Keeps your dog fresh and protected rain or shine, 24 hours post-application.

## Overview

Advantage Bayer II Flea and Lice Treatment delivers fast-acting, vet-recommended protection for medium dogs (11-20 lbs). This topical solution kills fleas at all life stages within 12 hours and provides 30 days of waterproof, fragrance-free defense. Easy to apply and safe for dogs over 7 weeks old, it prevents infestations and related health risks, ensuring your furry friend stays comfortable and flea-free all season long.

## Description

Advantage II Medium Dog is the vet-recommended prevention and treatment of flea and lice infestations in dogs. Advantage II Medium Dog flea treatment and prevention kills adult fleas, flea larvae and flea eggs to deliver total flea protection to your dog or puppy. In fact, within 12 hours of application, Advantage II Medium Dog topical treatment gets straight to work killing fleas through contact, so they don&x2019;t have to bite your dog to die. This 30-day treatment effectively breaks the flea life cycle, controlling existing flea and lice 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 Medium Dog is important to protect your dog against fleas that may cause transmission of tapeworms in dogs, Flea Allergy Dermatitis and flea bite anemia. That&x2019;s why Advantage II 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&x2019;ll also love that Advantage II is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. Advantage II Medium Dog flea and lice protection is effective on both indoor and outdoor dogs. Your dog should be at least 7 weeks old and weigh 11 to 20 lbs. to use Advantage II Medium Dog. For the ultimate convenience in care, Advantage II Medium Dog 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. Once Advantage II Medium Dog is applied, your dog is ready to get right back to exploring his favorite places &x2013; from the backyard to the dog park. Advantage II Medium Dog is a trademark of Elanco or its affiliates.

Review: This is our 2nd box of flea medication for our terrier mix, Krypto. It works as well as the other more expensive one we used to use. I don't like the idea of applying "poison" to anyone, including Krypto. However, I use this during the spring and summer months on him with no ill effects. One thing I like about this is that it's easy to apply. I go over and scratch behind his ears with one hand while emptying this behind his neck with the other. It's more effective than powders and shampoos.
Review: I did a ton of research and found out that this brand is the topical that disables and kills flees the fastest. As far as I can tell, that’s true. As soon as I put it on my dog, she had incredible relief from the flea infestation from hell in our yard and house that we just cannot seem to eliminate. Highly recommended.

## Features

- Item Category: Pet Pest Control
- Item Trademark: Bayer
- manufacturer: Bayer

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004QREOYG |
| Batteries Included | No |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,574) |
| Date First Available | 6 August 2012 |
| Item Form | Topical |
| Item Weight | 22.7 g |
| Item model number | 86336758 |
| Number of Items | 4 |
| Product Dimensions | 16.51 x 2.54 x 10.8 cm; 22.68 g |
| Quantity | 1 |
| Volume | 4 Milliliters |
| batteries required | No |

## Product Details

- **Active Ingredients:** Imidacloprid, Pyriproxyfen
- **Brand:** Advantage
- **Item form:** Topical
- **Item weight:** 0.05 Pounds
- **Scent:** Unscented

## Images

![Bayer II Flea and Lice Treatment for Medium Dogs, 11-20 lb, 4 doses - Image 1](https://m.media-amazon.com/images/I/71Uns06GOaL.jpg)

## Questions & Answers

**Q: My dog only goes out to get groomed every 3 months or to vet. Do I need to use this all the time or can I apply it 1 week before groom/vet day?**
A: This is a once a month topical treatment. You can apply prior to the appt. however it doesn't start to work until after the 1st 12 hours of being applied. 
Thank you. 
Heartland Vet Supply Customer Service

**Q: is this 4 mn or 6 mn / discrepancy in description**
A: There is an option for both 4 month and 6 month packages

**Q: Can I return this product?**
A: Hi. We recommend you contact the seller for a replacement or refund.

**Q: El producto es de bayer ? o es de elanco ?? porque el enunciado dice una cosa y la caja dice otra. esto es confuso !**
A: Hi. Elanco acquired Bayer Animal Health in 2020, including the Advantage II brand. 

To learn more about Advantage II and other Elanco products, visit PetBasics.Elanco.com.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by G***S on 19 October 2025*

This is our 2nd box of flea medication for our terrier mix, Krypto. It works as well as the other more expensive one we used to use. I don't like the idea of applying "poison" to anyone, including Krypto. However, I use this during the spring and summer months on him with no ill effects. One thing I like about this is that it's easy to apply. I go over and scratch behind his ears with one hand while emptying this behind his neck with the other. It's more effective than powders and shampoos.

### ⭐⭐⭐⭐⭐ Review
*by D***E on 17 October 2025*

I did a ton of research and found out that this brand is the topical that disables and kills flees the fastest. As far as I can tell, that’s true. As soon as I put it on my dog, she had incredible relief from the flea infestation from hell in our yard and house that we just cannot seem to eliminate. Highly recommended.

### ⭐⭐⭐⭐ Review
*by S***G on 9 December 2015*

I have used Frontline as long as I can remember, but for some reason its lost its effectiveness so I thought I'd give this a try. After a lot of research about all the various side effects of different medications (pet armor, frontline, Advantix for k-9's) I decided to go with Bayer Advantage (Advantix is for dog's but harmful if exposed to cats) since my 12.8lb Chinese Crested (Powder-Puff= has tons of hair) best friend is a cat this product was most appealing. I had a recent infestation of those little super fleas; you know, the ones that can hold their breath for 15 minutes and escape a pinch from your fingernail and possibly the blast from a nuclear bomb, yes those ones. I treated him in everything I could imagine including prolonged flea baths using Dawn Ultra, sprinkled Boric acid on the carpets/couch, made tiny little flea deathtraps and vacuumed incisively for two months straight all the while started using this product and low and behold the little effer's will literally falling off him. Forget Frontline, this stuff works!!! And the price is very friendly on your wallet. Word of advice, use this product BEFORE the flea season and make sure to prevent infestations from ever happening otherwise you'll be like me, feeling horrible watching your pup scratch non-stop not being able to focus on anything, giving three baths a week as well as bombing your house to rid yourself of the super fleas from hell who'll eventually develop a taste for your blood. Also, if your pup is small enough you can buy the large breed doses and get yourself a little dropper and ration out how much you pup actually needs...I googled it is something like 0.8ml so you can measure it out and reuse the leftover.

## Frequently Bought Together

- Advantage II Medium Dog Vet-Recommended Flea Treatment & Prevention | Dogs 11-20 lbs. | 4-Month Supply
- Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 4-Month Supply
- Advantage II Large Dog Vet-Recommended Flea Treatment & Prevention | Dogs 21-55 lbs. | 4-Month Supply

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-01*