What Is Fluralaner and How It Protects Dogs and Cats From Fleas and Ticks
Fluralaner is an FDA-approved ectoparasiticide ingredient used in prescription flea and tick medications for dogs and cats, most commonly known under the brand name Bravecto. It belongs to the isoxazoline class of drugs and works systemically by attacking the nervous system of fleas and ticks when they bite, causing paralysis and death within hours. The key advantage is long-lasting protection: a single dose provides up to 12 weeks of flea control and tick protection for most pets, which is significantly longer than monthly alternatives.
How Fluralaner Works Against Parasites
Fluralaner selectively inhibits GABA-gated and glutamate-gated chloride channels in the nervous system of fleas and ticks. These channels are essential for controlling nerve activity in insects and arachnids but don't exist in mammals at the same sensitivity level. When a flea or tick bites a treated pet, it ingests fluralaner through the pet's blood or skin fluids.
The parasite's nerves become hyperactive, leading to paralysis and death typically within 2 hours of the bite. This mechanism means the parasite doesn't need to be present on the pet before treatment starts working—new parasites that bite after treatment are eliminated quickly.
What Fluralaner Treats in Dogs and Cats
Fluralaner products protect against multiple parasite species, though protection duration varies by parasite and animal:
In cats, fluralaner has also been used off-label to treat ear mites and demodectic mange. For dogs, Bravecto Q Quantum (an injectable form) now provides year-long protection with a single veterinarian-administered dose.
Common Fluralaner Product Forms
Fluralaner is available in several administration forms:
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Topical solution applied to skin for dogs and cats
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Injectable (Bravecto Quantum) given by veterinarians for year-long protection
All fluralaner products require a veterinarian prescription in the United States. Dosage depends on the pet's weight, with dog chewable tablets ranging from 112.5 mg to 1.4 g. Cats receive a minimum dose of 18.2 mg/lb (40 mg/kg).
Safety Concerns and Side Effects You Should Know
While fluralaner is safe for most pets, there are important safety considerations:
Neurological side effects are the most serious concern. Isoxazoline products, including fluralaner, have been associated with neurologic adverse reactions such as muscle tremors, ataxia (loss of coordination), and seizures in some dogs and cats. The FDA has issued alerts about these potential adverse events.
Do not give fluralaner to pets with a history of seizures or neurological disease without careful veterinary consultation.
Common side effects in cats include:
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Vomiting
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Itchy skin
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Diarrhea
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Decreased appetite
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Lethargy
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Hair loss or scabbing at the application site
Common side effects in dogs are rare but may include:
The neurological risks are uncommon but real. Pet owners should monitor their animals after treatment and contact their veterinarian immediately if they observe tremors, weakness, or seizure activity.
When Fluralaner May Not Be the Right Choice
Fluralaner isn't suitable for every pet or situation. Consider these limitations:
Pets with seizure history: Fluralaner should be avoided or used with extreme caution in animals with prior seizures or neurological conditions.
Very young or underweight pets: Dosage requirements mean very small pets may not receive appropriate formulations. Always follow veterinary guidance for weight-based dosing.
Expecting immediate environmental relief: Fluralaner kills parasites when they bite, but it doesn't instantly eliminate existing infestations in your home. You may still need environmental cleaning and vacuuming alongside treatment.
Short-term needs: If you only need flea/tick protection for a few weeks (like a short vacation), the 12-week duration means you're committing to longer protection than needed.
Budget constraints: Prescription isoxazoline products tend to cost more than some monthly alternatives, though the longer duration may offset this over time.
For pets who can't tolerate isoxazolines, discuss alternative classes like spinosad (Comfortis) or larvicides with your veterinarian.
How HERO Veterinary Supports Flea and Tick Care
HERO Veterinary offers flea and tick products as part of their pet healthcare e-commerce catalog for cats and dogs, including isoxazoline-based options in their Flea & Tick category. As a pet healthcare brand incorporated in Hong Kong in 2018, they serve over 20,000 pets worldwide and cooperate with more than 300 pet clinics and hospitals.
Before purchasing any fluralaner product, consult your licensed veterinarian to confirm it's appropriate for your pet's specific health situation, especially if your pet has neurological history or is on other medications. HERO Veterinary provides 24/7 online customer support and worldwide shipping with a 14-day money-back guarantee, but prescription medications still require veterinary approval.
Frequently Asked Questions
Is fluralaner safe for all dogs and cats?
Fluralaner is safe for most healthy adult dogs and cats, but it should not be given to pets with a history of seizures or neurological disease without veterinary consultation. All fluralaner products require a prescription.
How quickly does fluralaner start working?
Fluralaner starts killing fleas within 2 hours of administration, providing rapid flea control.
How long does one dose of fluralaner last?
For most products, one dose provides 12 weeks of flea protection and tick control in dogs; cats receive 8–12 weeks depending on the tick species. The injectable Bravecto Quantum provides up to 12 months.
What are the most serious side effects of fluralaner?
The most serious risk involves neurological side effects including muscle tremors, ataxia, and seizures, though these are uncommon.
Can I buy fluralaner without a prescription?
No, fluralaner products like Bravecto require a veterinarian prescription in the United States.