Bravecto

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Bravecto

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Bravecto

Quick Facts

Property Description
Active ingredient Fluralaner
Form Chewable Tablet; Spot-on Solution
Pharmacological class Ectoparasiticide; Isoxazoline class
Common use Treatment and prevention of flea and tick infestations
Origin Synthetic

What Type of Medicine is Bravecto, and What is its Purpose?

Bravecto is a veterinary prescription medicine officially classified as a systemic ectoparasiticide, meaning its action is delivered throughout the animal's body to target external parasites. Its primary purpose is the treatment and prevention of flea and tick infestations in companion animals, such as dogs and cats. The drug belongs to the modern isoxazoline class of chemical compounds, a pharmacological class whose effectiveness in managing arthropod parasites is widely recognized in pharmacological studies.

Manufactured by MSD Animal Health, Bravecto is a single-agent product distinguished by its focus on providing long-lasting treatment for dogs and cats. The product offers a significant benefit in maintaining animal well-being by controlling infestations. This synthetic compound's systemic action pathway is key to its efficacy, offering a sustained defense against these common external threats.

Fluralaner: The Active Ingredient and Form

The product's efficacy is based on its single active ingredient, Fluralaner. This compound is supplied in two primary dosage forms for systemic delivery: a flavored chewable tablet for oral administration in dogs, and a spot-on solution, which is a topical formulation for both dogs and cats. Both pharmaceutical preparations ensure the Fluralaner is absorbed internally, allowing the compound to distribute effectively throughout the animal's system. This systemic delivery is consistently shown to provide persistent efficacy against the target parasites.

Regulatory References

  1. Bravecto (fluralaner) Chewable Tablets FDA Approval
  2. Bravecto (fluralaner) EPAR - EMA
  3. Bravecto (fluralaner) EPAR - Medicine overview

What side effects are possible with Bravecto?

Possible Side Effects and Safety Information

Bravecto (fluralaner) is a product in the isoxazoline class, and its safety profile, as documented in regulatory sources, is structured around both common, mild reactions and specific warnings for rare, serious events.


Adverse Reactions Scope

Common Adverse Reactions The most frequently reported adverse reactions are generally mild, transient, and involve the gastrointestinal system and general signs. These include vomiting, diarrhea, decreased appetite (anorexia), lethargy, and pruritus (itching).

Serious and Rare Adverse Reactions Fluralaner, as an isoxazoline, has been associated with neurologic adverse reactions in dogs and cats. Though reported as Very Rare in post-market surveillance, these serious events include tremors, ataxia (lack of coordination), and seizures (convulsions), even in animals without a prior history of such disorders. Regulatory bodies advise use with caution in animals with a known history of neurologic conditions.


Population-Specific Safety Considerations

Population Safety Consideration
Young Animals The 12-week duration of effectiveness is generally not established in puppies or kittens less than six months of age.
Breeding Animals Safety has not been established in breeding, pregnant, and lactating cats. Adverse events have been reported in breeding female dogs.
Route of Administration Topical solutions are for external use only, and oral ingestion should be avoided.

Regulatory Safety Summary

Regulatory agencies emphasize that the product belongs to a drug class associated with neurologic adverse events, making caution necessary for at-risk animals. The overall safety structure confirms that while most side effects are mild and self-limiting, the potential for rare, serious neurologic outcomes defines a key safety limitation, particularly concerning animals with a history of seizures or other neurologic disorders.

Overdose and Emergency Response

Regulatory studies conducted on Fluralaner, the active ingredient in Bravecto, established a wide safety margin. These studies demonstrated that no adverse reactions were observed in young animals when administered doses up to five times the maximum recommended dose on multiple occasions. Furthermore, specific safety studies documented that MDR1-deficient Collies tolerated a single oral dose up to three times the recommended dose without developing treatment-related clinical signs.

Despite these findings in controlled studies, Fluralaner belongs to the isoxazoline class of medicines, which regulatory authorities have associated with the potential for neurologic adverse reactions. These officially documented reactions include tremors, ataxia (loss of coordination), and the possibility of seizures. The potential for these serious central nervous system effects defines the need for immediate professional evaluation.

When an overdose is suspected or if severe neurologic signs occur, the regulator-mandated action is to seek urgent medical consultation. The official prescribing information states that no specific antidote is known for Fluralaner overdose. In the event of an overdose or the manifestation of severe symptoms, management is generally classified as symptomatic and supportive treatment. The label requires keeping the product secure to prevent accidental ingestion.

Therapeutic Uses of Bravecto

What Bravecto Treats: Main Uses and Benefits

This medication is commonly used across therapeutic domains involving external parasite management and may support long-term management of the parasitic burden. The product is primarily applied for the management of existing infestations and assistance with long-term prevention of adult fleas and several species of ticks. Bravecto is applied in addressing symptoms associated with acute or disruptive episodes related to parasitic activity, notably those dermatological manifestations associated with Flea Allergy Dermatitis (FAD), such as intense itching and self-inflicted skin lesions.

Its application is relevant in clinical settings involving specific mite-induced conditions like Sarcoptic mange and Demodectic mange. In these scenarios, the medication supports the relief of symptoms that create noticeable physiological strain. The medication is relevant when supportive symptom management is appropriate and assists in long-term management of recurrence factors. Overall, the medication contributes to easing the overall symptom load and **supports patients during episodes of heightened discomfort.


Quick Fact: Relief for Ectoparasitic Dermatitis Therapeutic Category Primary Condition Symptom Domains Addressed
External Parasite Control Flea and Tick Infestations Visible parasite presence, Itching, Skin irritation
Dermatology Support Flea Allergy Dermatitis (FAD) Pruritus, Inflammation, Excoriation
Acaricidal Use Mange (e.g., Sarcoptic) Skin scaling, Crusting, Hair loss

Regulatory References

  1. European Commission document on Fluralaner (Bravecto)

Eligibility and Restrictions for Use

Official Eligibility and Restriction Profile for Bravecto

Regulatory documents establish specific rules for who is eligible to use Bravecto (Fluralaner) and when its use is limited or contraindicated.

Classification Eligibility Criteria (Dogs)
Contraindicated Known hypersensitivity or allergy to the active substance (Fluralaner) or any of the product’s excipients.
Not Recommended Puppies less than 8 weeks old and/or dogs weighing less than 2 kg (approx 4.4 lb), due to a lack of established safety data.
Use with Caution Dogs with a history of seizures or other neurologic disorders.
Permitted Use Breeding, pregnant, and lactating dogs; safety has been demonstrated in these physiological states.

For products indicated for 12-week duration, the full efficacy period has not been shown in puppies less than 6 months of age. Use in any dog should not occur at intervals shorter than 8 weeks, as safety for shorter intervals has not been tested.

What should I know about interactions with other medicines?

Interaction Map: Interactions with other medicines and products — official regulatory information for Bravecto

Interaction Scope

Category Official Regulatory Statement
Medicinal product categories with documented interactions None documented. Clinical field studies found no interactions with routinely used veterinary products (e.g., vaccines, anthelmintics, antibiotics, steroids).
Specific interacting medicines (if explicitly listed) None. The theoretical risk of competition with highly protein-bound drugs like Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) or Warfarin was investigated.
Mechanistic basis of interactions (only if stated in label) None documented. The single mechanism investigated was plasma protein binding competition (risk formally dismissed).
Timing-based interaction rules (if applicable) None. No mandatory dose separation or timing requirements are stipulated in regulatory documents.
Population-specific interaction notes (if applicable) None. No interaction-specific cautions are documented for specific populations.
Interaction-related restrictions None. No restrictions are placed on co-administration with other medicines based on official interaction studies.

Interaction Classifications (High-Level)

Classification Type Official Regulatory Statement
Interaction severity classification (as defined in official documents) None documented. The primary statement is the absence of clinically significant interactions.
Regulatory basis (EMA / FDA / etc.) Based on controlled clinical field testing and in vitro studies reported in official prescribing information.
Interaction-context constraints (as defined in official documents) No known contraindications related to co-administration.

Resulting Interaction Structure

Official interaction statements:

  • No interactions were observed between the active ingredient, Fluralaner, and routinely used veterinary medicinal products, including vaccines, antibiotics, anthelmintics, and steroids, during clinical field testing.
  • No formal contraindications related to co-administration are known or stipulated in the regulatory documents.
  • Studies investigating the theoretical risk of plasma protein binding competition with highly bound drugs, such as Warfarin or NSAIDs, confirmed that no exposure-modifying interaction is expected.

Connection to the overall interaction profile

The regulatory documentation defines the product's interaction structure by affirming that no clinically significant drug-drug interactions were identified in controlled studies. This comprehensive finding leads to a profile that stipulates no required timing separation and no formal interaction-related restrictions for co-administration with other medicines.

Mechanism of Action

Targeted Blockade of Arthropod Inhibitory Channels

The mechanism initiates when the active ingredient, Fluralaner, acts as a non-competitive antagonist on two primary inhibitory receptors in the ectoparasite nervous system: the GABA receptors and the Glutamate-gated chloride channels ( GluCl). This selective action blocks the influx of chloride ions ( Cl^-), which are essential for inhibitory signaling, predominantly affecting the arthropod central nervous system.

Cascade of Hyperexcitation and Systemic Failure

The failure of these inhibitory channels leads to unchecked, persistent hyperexcitation of the parasite’s neurons. This continuous neural overstimulation quickly spreads to the neuromuscular system, resulting in irreversible paralysis and mortality of the feeding flea or tick.

Constraint: The Obligate Ingestion Requirement

The drug is designed for systemic distribution in the treated animal, meaning the mechanistic cascade is obligate on ingestion. The target parasite must actively ingest Fluralaner during the feeding process on the host for the molecular mechanism to be triggered and cause systemic failure.

Dosage and Administration Information

The administration of fluralaner (Bravecto) is defined by three official delivery methods: oral via chewable tablets, topical via spot-on solution, and subcutaneous injection via an extended-release suspension. The central principle of use is a weight-based dosing system, which requires selecting a specific product strength to deliver a minimum dose of 25 mg/kg body weight for dogs or 40 mg/kg for cats. For accurate dosing of animals above the maximum weight band, a combination of two unit strengths must be administered.

The standard treatment schedule is an intermittent pattern with a single dose administered every 12 weeks for persistent control. For certain tick species, a more frequent interval of every 8 weeks may be required.

Specific administration instructions are mandatory for correct use. The oral chewable tablets must be given with food or around feeding time to ensure proper absorption and must not be broken or divided. The topical solution is for external use only, applied directly to the skin along the dorsal line. Furthermore, usage of the 12-week formulation is restricted to dogs and puppies 6 months of age and older and weighing at least 4.4 lbs (2 kg). These instructions establish the standardized approach to use.

Recent Clinical Evidence

Bravecto: Recent Clinical Evidence

The active ingredient in all Bravecto products is fluralaner, a compound belonging to the isoxazoline class. Clinical research focuses primarily on two areas: establishing sustained efficacy against various parasites and monitoring the post-approval safety profile.


Efficacy Findings Against Ectoparasites

Studies across different formulations (chewable, topical, injectable) have consistently evaluated the drug's effectiveness against common fleas (Ctenocephalides felis) and ticks (e.g., Ixodes scapularis, Dermacentor variabilis). Key findings include:

  • Duration of Effect: Research supports that a single administration is associated with flea and tick control for an extended period, typically 8 to 12 weeks, depending on the parasite species and formulation studied.
  • Onset of Action: Trials have demonstrated that fluralaner begins to kill newly acquired fleas and ticks within hours of administration in both oral and topical forms, with specific timeframes varying by parasite and study design.
  • Long-Acting Formulations: More recent studies support the extended use of newer formulations, with one year-long study reporting sustained high efficacy (over 97%) against the brown dog tick (Rhipicephalus sanguineus) and fleas following a single dose of an extended-release injectable suspension.

Safety and Adverse Events

Fluralaner's safety profile has been a consistent focus of post-market surveillance and controlled field studies. The most frequently reported adverse events are often mild and transient, involving the digestive system. Reported adverse reactions across various formulations may include:

System Common Reported Reactions
Digestive Vomiting, diarrhea, decreased appetite (anorexia)
Neurologic Lethargy, tremors, ataxia, and seizures (reported rarely)

The isoxazoline class, to which fluralaner belongs, has been associated with neurologic adverse reactions. Therefore, cautious use is advised in dogs with a known history of seizures or other neurologic disorders. The safety of certain formulations has not been evaluated in breeding, pregnant, or lactating animals.

Frequently Asked Questions (FAQ)

Common questions about Bravecto (FAQ)

Q: How long does it take for Bravecto to start working after my pet takes it?

A: Studies and official product information indicate that a single dose is associated with an onset of effect. Efficacy against newly attached fleas is typically reached within 8 hours, and for newly attached ticks, it is within 12 hours of administration and attachment, according to product studies.

Q: Can the chewable tablet be broken or divided for my dog?

A: Regulatory documents indicate that the chewable tablet is intended to be administered whole and should not be broken, divided, or split to maintain proper dosing integrity. For animals exceeding the maximum weight band, specific product combinations are required; the tablet itself is not intended for division.

Q: What are the storage rules for Bravecto, and what about the shelf life?

A: Bravecto products should always be stored in their original packaging, out of the sight and reach of children. Both the chewable tablets and the topical solution should not be stored above 86 F (30 C). When packaged for sale, the typical shelf life of the product is 2 years.

Q: How quickly does Bravecto kill the fleas and ticks that are already on my pet before treatment?

A: The product’s effect is contingent upon the parasites feeding on the host. Official labeling reports that the product is associated with effectiveness against newly acquired parasites, typically within 8 hours for fleas and 12 hours for ticks after they attach and begin feeding.

Q: Is there a generic version of Bravecto available, or is Fluralaner only sold under the brand name?

A: Fluralaner is the active ingredient in Bravecto, which is sold as a brand-name Prescription Animal Drug. While single-agent fluralaner is primarily known under the Bravecto brand, regulatory-approved combination products that include fluralaner along with other ingredients are available in some markets.

Q: If I have an allergic reaction to applying the spot-on solution, what should I do?

A: Official safety information advises that individuals with a known allergy or hypersensitivity to fluralaner should avoid contact with the product. If accidental skin contact occurs, immediately wash the area thoroughly with soap and water. If symptoms like irritation or an allergic reaction develop or persist, seeking medical attention is recommended. Always take the product packaging with you.

Q: Does Bravecto prevent heartworm in dogs and cats?

A: The single-agent Bravecto product containing only fluralaner is officially indicated for the treatment and prevention of flea and tick infestations. However, regulatory authorities have approved certain combination products that pair fluralaner with other active ingredients to address heartworm prevention, depending on the species.

Q: What happens if my dog spits out or vomits the Bravecto chewable tablet after I give it?

A: If a dog vomits within 3 hours of administration, re-administration of a single dose may be warranted, as absorption may have been incomplete. If more time has passed, the medication is likely absorbed, and re-dosing is typically not necessary. Specific guidance for re-dosing should be obtained from a veterinarian.

How should Bravecto be stored and disposed of?

How to Store and Dispose of Bravecto

The storage and disposal instructions for Bravecto are defined by official regulatory documents to ensure product stability and environmental safety.

Storage Requirements

The Topical Solution must not be stored above 86 F (30 C) and must be kept in the original package to protect from moisture; the pouch should be opened only immediately before use. The Topical Solution is also highly flammable and must be kept away from sources of ignition. Chewable Tablets have no special storage conditions required. The shelf life for the product as packaged for sale is typically 2 years.

All Bravecto products must be stored out of the sight and reach of children and kept in the original packaging until use.

Disposal Instructions

Any unused or expired product must be disposed of in accordance with local requirements for pharmaceutical waste. The product and waste materials should not be disposed of via wastewater or household waste.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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