Comparison of External Parasite Medications (Bravecto, NexGard, Simparica)

Skin & CoatComparisonsMeongsiljang Veterinary Advisory Board

Compare the duration, coverage, side effects, and prices of the top three flea and tick medications for dogs—Bravecto, NexGard, and Simparica—at a glance. We’ll guide you on how to choose the right product based on your dog’s weight and living environment.

What Are External Parasite Preventatives?

Comparison of three types of external parasite medications - representative image

External parasite preventatives are medications that help prevent and eliminate parasites like fleas, ticks, and mites that attach to your dog’s skin, feed on blood, or lay eggs. What’s truly important is that each product has a different duration of protection and coverage range, so it’s essential to choose one that fits your pet’s lifestyle and environment. In this article, we’ll compare the three most commonly used products in Korea—Bravecto, NexGard, and Simparica—based on their duration of protection, coverage range, side effects, and price.

All Three Products Belong to the Same Class

Bravecto, NexGard, and Simparica all belong to the isoxazoline class of medications. This class works by inhibiting glutamate- and GABA-gated chloride channels in the nervous systems of invertebrates such as fleas and ticks, causing paralysis and death of the parasites. Because they have minimal effect on mammalian receptors, they are relatively safe. Oral formulations are effective against both flea and tick infestations. Even within the same class, differences in active ingredients and absorption and elimination rates result in varying durations of protection. Note that fluralaner, the active ingredient in Bravecto, is available not only as an oral medication but also as a topical spot-on application, so the administration method can be chosen based on your pet’s condition and your veterinarian’s recommendation.

At-a-Glance Comparison of the Three Products

Item	Bravecto	NexGard	Simparica
Active ingredient	Fluralaner	Afoxolaner	Sarolaner
Formulation	Chewable tablet	Chewable tablet (soft)	Chewable tablet
Duration	12 weeks (3 months)	1 month	1 month
Flea coverage	True	True	True
Tick coverage	True	True	True
Sarcoptic mange mite coverage	True	True	True
Demodex coverage	True	True	True
Minimum age of use	6 months or older	8 weeks or older	6 months or older
Price per dose	About 40K–60K KRW	About 20K–30K KRW	About 30K–40K KRW

Average price at domestic animal hospitals as of April 2026, varies by body weight. Coverage of sarcoptic mange and demodex is a common trait of the isoxazoline class; follow the product label and veterinarian's judgment for actual applicability

Key Selection Criteria

Here’s a breakdown of each product’s strengths: - Bravecto: Convenient with a 3-month interval, ideal for busy pet owners or dogs that resist medication. - NexGard: Affordable and well-tolerated due to its soft chew formulation, suitable for puppies as young as 8 weeks. - Simparica: Covers mites and demodex, recommended for dogs with recurring skin issues. If your dog is frequently exposed to ticks during walks or camping trips, Bravecto’s longer-lasting protection is advantageous. For growing dogs whose weight changes often, NexGard and Simparica are more convenient since their dosage can be adjusted monthly.

Giving a chewable external parasite medication to a puppy

Common Precautions for Isoxazoline-Class Medications

The U.S. FDA has issued an official warning that isoxazoline-class medications can rarely cause neurological side effects in some dogs, such as muscle tremors, ataxia, and seizures. Dogs with a history of epilepsy must only use these medications after consulting with a veterinarian. Please closely monitor your pet for any unusual behavior for 48 hours after the first dose.

Dosage by Weight and Administration Timing

All three products come in specific sizes based on weight ranges, so your veterinarian will determine the appropriate dosage and schedule according to your pet’s weight. There are two basic principles to follow: - Follow the product instructions: Some products recommend administration with food or after meals, so please follow the label instructions and your veterinarian’s guidance exactly. - Administer on the same date each month (or every three months): Giving the medication on the same day each time helps prevent gaps in protection. If your pet vomits shortly after taking the medication, it may not have absorbed the full dose. However, do not give another dose without consulting your veterinarian, as this could lead to an overdose. Instead, note when and how much was vomited, and discuss with your vet whether a repeat dose is necessary. If you notice any unusual neurological symptoms, stop administering the medication and contact your veterinarian immediately.

A pet owner marking medication days on the calendar

Feature Cards by Active Ingredient

Safe

플루랄라너(Fluralaner)

벼룩·진드기·옴·모낭충 광범위 커버

Dosage: 체중별 규격, 12주 간격

Taenzler 연구팀(2014) 98% 이상 효과 입증

Safe

아폭솔라너(Afoxolaner)

벼룩·참진드기 표준 커버

Dosage: 체중별 규격, 1개월 간격

8주령부터 안전성 확인

Safe

사롤라너(Sarolaner)

벼룩·진드기·옴·모낭충 커버

Dosage: 체중별 규격, 1개월 간격

Six 연구팀(2016) 모낭충 치료 효과 확인

Which Product Is Right for Your Situation?

Here are our recommendations based on your pet’s living environment: - Small dogs that live primarily indoors: NexGard (excellent value and accessibility) - Active dogs that frequently visit mountains or grassy areas: Bravecto (strong protection lasting up to 3 months) - Dogs with recurring skin conditions or demodex mites: Simparica (covers skin parasites as well) - Households with multiple cats or dogs: Using products from the same active ingredient class simplifies management - Senior dogs or those with pre-existing conditions: Always consult your veterinarian before deciding In areas where tick-borne diseases (such as babesiosis and Lyme disease) are prevalent, products with longer-lasting efficacy help minimize gaps in protection.

Medications and Breeds to Avoid Combining

You can use external parasite medications and heartworm preventatives together as long as their active ingredients do not overlap. However, for breeds prone to MDR1 gene mutations—such as Collies, Shetland Sheepdogs, and Australian Shepherds—testing is essential before combining ivermectin-based products with other dewormers. Never administer multiple products from the same isoxazoline class simultaneously.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Does a single dose of Bravecto really keep ticks away for three months?

These medications don’t prevent ticks from attaching in the first place. Instead, isoxazoline-based drugs kill ticks during the early stages of blood-feeding, as the ticks are exposed to the medication while attached to the skin. However, since they don’t provide 100% protection against tick-borne diseases, it’s still important to check your pet thoroughly after walks and manually remove any attached ticks.

Can I switch to a different product? If so, how long should I wait between switching?

Yes, you can switch products. Simply transition to the next product according to its dosing schedule, starting from the date of the last dose. For example, if you switch to Bravecto one month after the last NexGard dose, you’ll maintain continuous protection without any gaps.

Can I give this to my pregnant or nursing dog?

Safety data for pregnant and nursing dogs vary by product. A veterinarian’s assessment is essential, and self-medication should be avoided.

Can ticks be transmitted to humans as well?

Yes, ticks that attach to your dog can transfer to humans. It’s important to develop the habit of checking your clothes and skin after walks.

Is it the same for products purchased directly from overseas?

Although the ingredients are the same, differences in specifications, weight-based dosing ranges, and packaging between domestic and foreign products can lead to dosing errors. Additionally, it is difficult to track adverse reactions if they occur, so we recommend using products prescribed by a veterinarian.

Top 5 Medicated Dog Shampoos — For Pyoderma and Bacterial Infections

Top 7 Low-Shedding Cat Breeds

Top 5 Dog Skin Supplements for 2026

Bichon Frise vs Maltese Comparison — Temperament, Health, and Care Summary

Toy Poodle vs. Standard Poodle Comparison

Comparison Guide to Cat Kidney Supplements

Complete Guide to Dog Grooming and Trimming Costs

Guide to Comparing Supplement Brands

Comparison Guide to Energy and Appetite Supplements

Comparison of Dog Joint Supplement Ingredients

References

[1] Taenzler, J. et al., Efficacy of fluralaner against Ixodes ricinus and Ctenocephalides felis on dogs, Parasites & Vectors, 2014

[2] Six, R.H. et al., Efficacy of sarolaner, a novel oral isoxazoline, against two common mite infestations in dogs, Veterinary Parasitology, 2016

[3] Plumb's Veterinary Drug Handbook, 10th Edition, Isoxazoline Class Drugs Chapter, 2023

[4] FDA Center for Veterinary Medicine, Fact Sheet for Pet Owners and Veterinarians about Potential Adverse Events Associated with Isoxazoline Flea and Tick Products, 2021

Comparison of External Parasite Medications (Bravecto, NexGard, Simparica)

What Are External Parasite Preventatives?

All Three Products Belong to the Same Class

At-a-Glance Comparison of the Three Products

Key Selection Criteria

Dosage by Weight and Administration Timing

Feature Cards by Active Ingredient

플루랄라너(Fluralaner)

아폭솔라너(Afoxolaner)

사롤라너(Sarolaner)

Which Product Is Right for Your Situation?

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Frequently Asked Questions

Related Guides

References