Bravecto vs NexGard? (2026 Comparison)

🔑 Key Findings

Bravecto lasts 12 weeks per chew, while NexGard requires monthly dosing.

NexGard is safe for puppies as young as 8 weeks, whereas Bravecto requires dogs to be 6 months old.

Both drugs carry an FDA warning for neurological adverse events like tremors and seizures.

Bravecto is significantly cheaper per month (approx. $25/mo vs. $30/mo for NexGard).

The Short Answer

If your dog is healthy and over 6 months old, Bravecto is the better value and convenience choice. One chew covers you for nearly three months, reducing the chance of missing a dose. It is also the only oral preventative approved for pregnant and breeding dogs.

However, if you have a puppy under 6 months, NexGard is your only oral choice between the two. Both drugs use the same class of pesticide (isoxazolines) and carry the same FDA warning for seizures. If your dog has a history of seizures or tremors, you should avoid both and look for non-systemic alternatives like Safest Flea Treatment.

Why This Matters

Fleas and ticks aren't just gross; they carry diseases like Lyme and Ehrlichiosis. But the "cure" involves feeding your dog a pesticide that stays in their bloodstream for weeks. Both Bravecto and NexGard work by poisoning your dog's blood so that parasites die when they bite.

The active ingredients—Fluralaner (Bravecto) and Afoxolaner (NexGard)—are part of the isoxazoline class. In 2018, the FDA issued a warning that these drugs are linked to neurological adverse events including muscle tremors, ataxia, and seizures. While rare, these side effects can happen in dogs with no prior history.

What's Actually In Them

Both products rely on powerful synthetic insecticides.

Fluralaner (Bravecto) — Stays in the system for 12 weeks. It starts killing fleas within 2 hours and ticks within 12 hours. Because it lasts longer, the initial dose concentration is higher than a monthly pill.
Afoxolaner (NexGard) — Stays in the system for 1 month. It kills fleas within 4-24 hours. It requires strict monthly compliance to avoid protection gaps.
Hydrolyzed Soy/Corn (Flavoring) — Both use artificial meat flavorings (pork or beef) to make the chews palatable. These are generally safe for allergic dogs, but check with your vet if your dog has severe food allergies. Dog Food Ingredients To Avoid

What to Look For

Green Flags:

Convenience: Bravecto's 12-week window means you only think about fleas 4 times a year.
Speed: Bravecto kills fleas in 2 hours; NexGard takes up to 24.
Puppy Safety: NexGard is safe for puppies as small as 4 lbs and 8 weeks old.

Red Flags:

Seizure History: If your dog has ever had a seizure, do not use these.
Stomach Upset: Vomiting and diarrhea are the most common side effects. NexGard has a slightly higher reported rate of vomiting (8-10%) compared to Bravecto (5-7%).
Lyme Prevention: Only Bravecto kills the specific tick species fast enough to reliably prevent Lyme transmission in all cases, though NexGard is also FDA-approved to prevent Lyme infections.

The Comparison

Feature	Bravecto	NexGard
Active Ingredient	Fluralaner	Afoxolaner
Dosing	Every 12 Weeks	Monthly
Minimum Age	6 Months	8 Weeks
Min Weight	4.4 lbs	4 lbs
Kills Fleas In	2 Hours	4-24 Hours
Cost Per Month	~$25	~$30
Pregnant Dogs	✅ Approved	🚫 Not Evaluated
Verdict	Best for Adults	Best for Puppies

The Bottom Line

1. Choose Bravecto if you have an adult dog (6+ months) and want to save money and hassle. It’s cheaper annually and requires less remembering.

2. Choose NexGard if you have a growing puppy (8 weeks - 6 months). It is the standard for young dogs.

3. Avoid Both if your dog has a history of seizures, tremors, or severe neurological issues. Opt for natural repellents or topical options that don't enter the bloodstream as aggressively.

FAQ

Does Bravecto cause more seizures than NexGard?

No data suggests one causes more seizures than the other. Both trigger the same FDA warning for the isoxazoline class. If your dog reacts to one, they will likely react to the other.

Can I give Bravecto to a 4-month-old puppy?

No. Bravecto is only approved for dogs 6 months and older. For a 4-month-old puppy, NexGard is the safe choice.

Which is cheaper?

Bravecto is cheaper. While one box costs more ($60-$80), it lasts 3 months. NexGard costs about $30 per dose. Over a year, Bravecto saves you roughly $40-$60.

References (15)

🛒 Product Recommendations

✅

Flea & Tick Spray for Pets + Home

Wondercide

A proven natural alternative that kills fleas and ticks on contact using cedarwood and peppermint oil. Unlike systemic pills, it does not enter your dog's bloodstream; testing confirms 100% efficacy against fleas in lab trials.

Recommended

✅

Sentinel Flavor Tabs

Merck Animal Health

A safer oral preventative that uses lufenuron to sterilize flea eggs and larvae rather than killing adults via neurotoxins. It avoids the isoxazoline class entirely, making it a preferred choice for dogs with a history of seizures.

Recommended

✅

Flea & Tick Protect Spray

Kin+Kind

Vet-formulated plant-based spray that uses active ingredients like cedarwood and peppermint oil to repel pests. It is free from chemical pesticides and artificial fragrances, making it safe for daily use on dogs with sensitive skin.

Recommended

👌

Frontline Plus for Dogs

Boehringer Ingelheim

Uses fipronil, which stores in the oil glands of the skin rather than circulating aggressively in the bloodstream like isoxazolines. While resistance is a concern in some regions, it remains a safer chemical profile for dogs prone to neurological issues.

Acceptable

✅

Capstar Tablets

Elanco

The safest option for immediate infestation relief, using nitenpyram to kill adult fleas within 30 minutes. It leaves the system completely within 24 hours, avoiding long-term systemic pesticide exposure.

Recommended

👌

Advantage II

Elanco

A topical solution using imidacloprid that spreads over the skin layer to kill fleas on contact, so they don't have to bite your dog to die. It is safe enough for puppies as young as 7 weeks but does not provide tick protection.

Acceptable

✅

Double Row Flea Comb

Safari

A non-toxic, mechanical method essential for checking effectiveness of other products and removing pests from puppies too young for chemicals. The double-row design effectively traps fleas and eggs that single-row combs miss.

Recommended

👌

Flea & Tick Home Spray

Vet's Best

A budget-friendly, plant-based contact killer using peppermint oil and eugenol (clove extract). Effective for treating bedding and furniture, though the strong scent may be overpowering for some sensitive dogs.

Acceptable

✅

Tick Twister

O'Tom

The gold standard tool for mechanical tick removal, designed to unhook the tick's mouthparts without squeezing the abdomen. Prevents the regurgitation of Lyme-causing bacteria into the bloodstream during removal.

Recommended

👌

Nature's Protection Herbal Drops

Earth Animal

A holistic internal blend utilizing herbs like quassia bark and neem to alter the dog's scent, making them less attractive to pests. Best used as a supplementary layer of protection rather than a standalone cure for infestations.

Acceptable

✅

Cedarcide Original

Cedarcide

Uses non-toxic cedar oil to dehydrate and kill fleas and ticks on contact without harsh chemicals. Safe for use on dogs, people, and indoor surfaces, making it a versatile option for total home protection.

Recommended

⚠️

Simparica Trio

Zoetis

Contains sarolaner, an isoxazoline drug covered by the FDA's warning for potential neurological adverse events. Like Bravecto and NexGard, it has been linked to seizures and tremors, even in dogs without a prior history.

Use Caution

🚫

UltraGuard Pro Flea & Tick Drops

Hartz

Contains tetrachlorvinphos, an organophosphate pesticide classified as a likely human carcinogen and neurotoxin. This brand is associated with a high volume of consumer reports citing severe adverse skin and neurological reactions.

Avoid

⚠️

Seresto Collar

Elanco

Linked to over 100,000 EPA incident reports and 2,500+ reported pet deaths since 2012. While still approved, the EPA now requires enhanced warning labels due to the risk of skin lesions and neurological symptoms.

Use Caution

🚫

Ultrasonic Pet Repeller

Tickless

Studies consistently show ultrasonic devices have zero efficacy in repelling fleas or ticks. Parasites have been observed walking directly over these active devices without being deterred.

Avoid

🚫

Guardian Squeeze-On for Dogs

Sergeant's

Uses permethrin and other older pyrethroids that have a higher rate of adverse skin reactions, including paresthesia (burning/tingling skin). Extremely toxic to cats, posing a lethal risk in mixed-pet households.

Avoid

⚠️

Comfortis

Elanco

Uses spinosad, which frequently causes vomiting and lethargy as side effects. It lowers the seizure threshold and should be used with extreme care in dogs with any history of epilepsy.

Use Caution

🚫

BioPower Pet Tag

BioPower

Claims to use 'bio-resonance energy' to repel pests, a mechanism with no scientific basis or proven efficacy. Relying on this for protection leaves dogs completely vulnerable to tick-borne diseases like Lyme.

Avoid

⚠️

Credelio

Elanco

Another member of the isoxazoline class (lotilaner) carrying the same FDA alert regarding neurological risks. Offers no safety advantage over NexGard or Bravecto regarding seizure potential.

Use Caution

🚫

Garlic Barrier Chews

Generic / Home Remedies

Feeding garlic is controversial and risky; it contains thiosulfate, which causes oxidative damage to red blood cells and can lead to hemolytic anemia. Effective doses for flea repellency often overlap with toxic doses.

Avoid

⚠️

Spot On Flea & Tick

Zodiac

Relies on older pesticides like permethrin that are harsh on the skin and dangerous around cats. Reports of chemical burns and hair loss at the application site are more common than with modern prescription options.

Use Caution

💡 We don't accept payment for recommendations. Some links may be affiliate links.

Bravecto vs NexGard? (2026 Comparison)

TL;DR

🔑 Key Findings

The Short Answer

Why This Matters

What's Actually In Them

What to Look For

The Comparison

The Bottom Line

FAQ

Does Bravecto cause more seizures than NexGard?

Can I give Bravecto to a 4-month-old puppy?

Which is cheaper?

🛒 Product Recommendations

📖 Related Research

Is Dog Food Safe? The Truth About Toxins, Kibble, and Recalls

Is Kibble Bad for Dogs? The Hidden Risks of Dry Dog Food

Are There Heavy Metals in Dog Food?

More about Pet Products

Search GetCrunchy

TL;DR

🔑 Key Findings

The Short Answer

Why This Matters

What's Actually In Them

What to Look For

The Comparison

The Bottom Line

FAQ

Does Bravecto cause more seizures than NexGard?

Can I give Bravecto to a 4-month-old puppy?

Which is cheaper?

🛒 Product Recommendations

📖 Related Research

Is Dog Food Safe? The Truth About Toxins, Kibble, and Recalls

Is Kibble Bad for Dogs? The Hidden Risks of Dry Dog Food

Are There Heavy Metals in Dog Food?

More about Pet Products