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Bravecto S

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Bravecto S

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Medically reviewed

Laura Arias

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.

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Overview of Bravecto S

Bravecto S is a veterinary prescription-only medicine for dogs, manufactured and globally distributed by Merck Animal Health. It is a single-active-ingredient product classified as a systemic ectoparasiticide.


Quick Facts

Property Description
Active Ingredient Fluralaner
Form Spot-on solution (Topical formulation)
Pharmacological Class Isoxazoline class, systemic ectoparasiticide
General Purpose Sustained antiparasitic control
Origin Synthetic compound
Manufacturer Merck Animal Health

What Type of Veterinary Medicine is Bravecto S?

Bravecto S is classified as a systemic ectoparasiticide and acaricide, meaning it is designed to circulate within the animal's body to eliminate parasites after feeding. The active substance, Fluralaner, is a synthetic compound belonging to the isoxazoline class of chemicals. This chemical designation confirms its role as a novel entity specifically developed for highly targeted action against arthropods. Its formulation as a spot-on solution provides an effective alternative route of administration for dogs who may experience difficulty with oral medications.

Composition and Form: The Fluralaner Spot-On Solution

The medicine is presented as a topical formulation, specifically a clear spot-on solution, which is applied directly to the skin. The composition is centered on the pure active ingredient Fluralaner, dissolved within a specialized oily vehicle base. This formulation is critical because the vehicle aids the compound's efficient absorption through the skin into the dog’s systemic circulation following the topical administration. The drug is readily absorbed from the application site to maintain concentrations that support its extended duration of action.

How Bravecto S Provides General Antiparasitic Control

The general purpose of Bravecto S is to provide sustained, systemic efficacy for the continuous control of external parasites. This is achieved because Fluralaner works as a targeted neurotoxin, acting specifically on the nervous systems of arthropods (fleas and ticks). This mechanism results in the parasite's lethal paralysis upon exposure. The primary benefit of this systemic approach is its capacity for extended duration of action, ensuring effective and continuous management of the parasite burden with a low frequency of administration.

Regulatory References

  1. EMA Medicine Overview
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What side effects are possible with Bravecto S?

Possible Side Effects and Safety Information

The safety profile for Bravecto (fluralaner) is formally documented based on government regulatory reviews, which categorize adverse reactions by frequency and organ system.

Frequency-Classified Adverse Reactions

The most frequently reported side effects are generally mild and temporary:

  • Common (Affects 1% to 10% of treated animals): Gastrointestinal disturbances such as vomiting (emesis), diarrhea, decreased appetite (anorexia), and drooling (hypersalivation).
  • Very Rare (Affects less than 0.01% of treated animals): Neurological effects, including lethargy, muscle tremor, incoordination (ataxia), and convulsion (seizure).

Serious Adverse Reaction Caution

Fluralaner belongs to the isoxazoline class of drugs, which regulatory bodies have formally associated with neurological adverse reactions. This includes reports of tremors, ataxia, and seizures. This class-specific safety information is a key component of the official safety profile.

Population-Specific Restrictions and Limitations

  • Neurological History: Use with caution in animals with a history of seizures or other neurologic disorders, including pre-existing epilepsy.
  • Age and Weight: The product is not authorized for use in puppies less than 8 weeks old or dogs weighing less than 2 kg.
  • Dosing Interval: Administration should not occur at intervals shorter than 8 weeks.
  • Contraindication: Do not use if the animal has a known hypersensitivity to the active substance (fluralaner) or any of the excipients.
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Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information for Bravecto (fluralaner) primarily establishes a wide margin of safety based on controlled studies.


Documented Overdose Profile

Regulatory safety studies in target animals (dogs and puppies) administered oral doses up to five times the maximum recommended dose (e.g., 280, mg fluralaner/kg body weight) observed no adverse reactions or clinical signs of overdose. This finding establishes high tolerance in the target species.

  • Population Tolerance: The medication was well tolerated at overdose levels in vulnerable populations, including puppies aged 8–9 weeks, MDR1-deficient Collies, and breeding, pregnant, or lactating dogs.
  • Serious Outcomes: While controlled studies showed no ill effects, post-market surveillance for the isoxazoline class of medications (which includes fluralaner) has received very rare reports of serious neurological signs, such as seizures and ataxia.

Emergency Actions and Management

Since no signs of overdose were observed in controlled studies, official regulatory documents do not mandate specific immediate actions for overexposure in the target animal. However, if any neurological signs or other serious adverse events are observed following suspected overexposure, veterinary attention should be sought promptly.

  • Antidote: No specific chemical antidote is known for fluralaner overdosage.
  • Management: Management is restricted to symptomatic and supportive care as needed.

In the event of human accidental ingestion, regulatory safety data advises not to induce vomiting and to get medical attention immediately.

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Therapeutic Uses of Bravecto S

What Bravecto S Treats: Main Uses and Benefits

The therapeutic utility of Bravecto S (Fluralaner spot-on for dogs) is commonly used to help with management that provides support against external parasitic arthropods, which supports the easing of symptoms related to associated skin diseases and discomfort. It is relevant in clinical situations marked by active parasitic burdens or the risk of re-infestation.

The medicine is applied across domains where additional symptomatic support is needed. Its use is relevant for easing symptoms associated with flea and tick infestations, and for the therapeutic management of mite-induced skin conditions such as demodicosis and sarcoptic mange. It also plays a supportive role in managing Flea Allergy Dermatitis (FAD).


Sustained Control and Symptom Relief

This application is commonly used to help with the initial management of active infestations by common fleas and multiple species of ticks, and is relevant for supporting sustained control over an extended period. This provides supportive relief when symptoms interfere with routine activities.

For mite-related conditions, the treatment may assist in the therapeutic management of mite-related conditions, which helps ease the overall symptom burden by supporting the improvement in pronounced pruritus and inflammation. This assists with maintaining functional stability.


Quick Fact: Therapeutic Use

Symptom Category Therapeutic Benefit
Pruritus (Intense Itching) Contributes to improved comfort by addressing the source of the allergic or irritative state.
Dermatitis/Skin Symptoms Supports healing by easing the inflammatory symptoms caused by mites and flea bites.
Infestation Risk Provides supportive control over an extended period against new parasitic acquisitions.

Regulatory References

  1. European Medicines Agency product information
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Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Bravecto S

This eligibility profile is based strictly on governmental regulatory documentation for Fluralaner spot-on solution for dogs.

Eligibility Classification Population Group Regulatory Status
Absolute Contraindication Dogs with known hypersensitivity to Fluralaner or any excipients. Contraindicated
Use Not Recommended Puppies less than 8 weeks old or dogs weighing less than 2 kg (4.4 lbs). Not recommended (due to lack of data)
Conditional Use Dogs with a history of seizures or other neurologic disorders. Use with caution
Authorized Use Dogs 8 weeks of age and older and weighing at least 2 kg. Allowed
Reproductive Status Breeding, pregnant, and lactating dogs. Can be used

Official regulatory documents define the eligibility profile through specific, labeled requirements. The medicine is explicitly contraindicated only for those dogs with known hypersensitivity to the active substance. Furthermore, use is not recommended for the very young or very small dogs, as safety data in these groups are absent. The regulatory label also requires caution when the product is used in dogs with a history of neurologic conditions.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Bravecto S (fluralaner spot-on solution) indicates a high degree of compatibility with products routinely co-administered in veterinary practice, with no known formal contraindications based on drug-drug interaction risk.


Documented Interaction Profile

Clinical field studies and regulatory reviews have established the following about the product's interaction structure:

  • Concurrent Use Compatibility: No adverse reactions were observed during controlled studies when Bravecto S was used concurrently with commonly administered medicinal products, including vaccines, anthelmintics, antibiotics, and steroids. This confirms the product's compatibility with standard veterinary treatment protocols.

  • Absence of Exposure-Altering Interactions: The active substance, Fluralaner, is highly bound to plasma proteins. While this characteristic theoretically suggests potential competition with other highly bound agents, such as certain Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) or the coumarin derivative warfarin, in vitro studies confirmed that Fluralaner did not reduce the protein binding of these substances.


Restrictions and Requirements

Restriction Category Regulatory Statement
Formal Contraindications None specified due to drug-drug interaction risk.
Timing Requirements No mandatory separation periods are specified for co-administration with other medicinal products.
Food/Herbal Interactions None documented (medicine is a topical spot-on solution).
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Mechanism of Action

Targeting Arthropod Inhibitory Neurotransmission

Fluralaner operates by acting as a selective, non-competitive antagonist of two major inhibitory receptors in the parasite's central nervous system: the gamma-aminobutyric acid (GABA)-gated and L-glutamate-gated chloride channels (GluCls). By occupying the channel pore, the drug prevents the influx of chloride ions ( Cl^-), which are essential for dampening nerve activity. The mechanism demonstrates differential binding affinity between arthropod and mammalian receptors.


The Cascade to Paralysis

The blockade of inhibitory signaling triggers an uncontrolled hyperexcitation of the arthropod's central neurons. This uncontrolled electrical activity quickly escalates, leading to irreversible paralysis and cessation of nerve-driven motor control in the parasite shortly after it has ingested the drug. The mechanism is obligately systemic, requiring the parasite to commence feeding on the host to initiate the toxic cascade.

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Dosage and Administration Information

Administration and Dosing Instructions

Bravecto S (fluralaner) is administered either orally as a chewable tablet or topically as a spot-on solution.

Official Dosing Rules

Treatment is based on the dog's body weight, ensuring a minimum target dose of 25 mg of fluralaner per kg of body weight. The dog must be weighed, and the corresponding fixed-dose product strength must be administered whole. Tablets must not be broken or divided. For dogs exceeding the largest weight band (56 kg), the appropriate combination of available product strengths must be used to match the animal's weight most closely.

Administration Route Instructions for Use
Oral (Chewable Tablet) Administer at or around the time of feeding (with food). The dog must be observed to confirm the entire tablet is swallowed.
Topical (Spot-on Solution) Apply the entire contents directly to the skin along the dog’s back, starting between the shoulder blades. The dog should be standing or lying with its back horizontal. Before application, the tube's cap must be rotated one full turn to break the seal.

Frequency and Treatment Interval

Bravecto is administered as a single dose. The standard retreatment interval is 12 weeks. The product must not be administered at intervals shorter than 8 weeks, as the safety for shorter intervals has not been established. Treatment can commence at any time of the year.

Population Restrictions

Use is restricted to dogs and puppies weighing at least 2 kg (4.4 lbs) and generally 6 months of age or older (for oral and topical products, varying slightly by region and formulation). The product is restricted to use by or on the order of a licensed veterinarian.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Bravecto S

Official research describing the clinical evaluation of Bravecto S (fluralaner spot-on solution) is available through regulatory bodies and peer-reviewed scientific literature. The studies explored the effects of the compound on various external parasites and associated conditions, focusing on the duration of observed activity and the outcomes measured in controlled and real-world conditions. This overview describes the structure of the evidence without providing individual advice or clinical recommendations.


Evidence for Use in Flea and Tick Control

Research into the use of Bravecto S for external parasite control primarily utilizes Randomized Controlled Trials (RCTs). These studies were designed to compare the compound's properties against negative control groups or sometimes against other approved products. Researchers primarily monitored two key outcomes: the speed of activity against the parasite population and the duration of observable reduction over a specific time period. Findings describe patterns of early onset of activity measured in laboratory models. The field studies, relevant in trials assessing short-term or episodic symptom patterns, reported that the observed effect against common flea species and some specific tick species was monitored for up to 12 weeks.

The body of evidence for this indication is classified as High (based on evidence certainty grading). Research so far explores the range of effectiveness against all tick species that a dog might encounter globally. Additionally, there is limited information for long-term outcomes, meaning data on the durability of the observed effect beyond the typical 12-week re-treatment cycle is not the primary focus of initial registration trials.


Evidence for Use in Mite-Induced Skin Conditions

For Generalized Demodicosis, controlled field studies described measurable mite clearance (a parasitological outcome) at assessment time points, which was associated with an observed pattern of change in skin condition. For Sarcoptic Mange, research examined the parasitic clearance and monitored patient-reported outcomes describing perceived discomfort. Studies reported that while mite clearance occurred in the early phase of the study, the resolution of severe skin symptoms often required a longer observation period.

Research also explored the compound’s relationship to symptoms associated with Flea Allergy Dermatitis (FAD). This outcome is linked to the reduction of fleas, which are associated with the allergic reaction. Research reports monitoring the evolution of associated skin inflammation and pruritus in animals diagnosed with FAD during the study period.


Uncertainty, Evidence Gaps, and Research Limitations

While the evidence landscape is generally robust for the core parasitic indications, limitations and areas of uncertainty are present. Follow-up durations were limited in many primary trials, meaning that long-term effects are not fully established. Sample sizes were modest in some specific field studies. Comparative evidence is lacking for how the spot-on performs against all available standard comparator treatments.

Key Studies & References European Medicines Agency Product Information Annex I, Summary of Product Characteristics (Bravecto)

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Frequently Asked Questions (FAQ)

Common questions about Bravecto S (FAQ)

Q: Is it safe to use Bravecto S if my dog has a history of seizures?

Official product information advises using Bravecto S with caution in dogs that have a pre-existing history of epilepsy or other neurologic disorders. Regulatory documents note that products in this class (isoxazolines) have been associated with neurological adverse reactions, including seizures. Disclosure of any history of seizures to a licensed veterinarian is required prior to using the product.

Q: What should I do with the unused or expired spot-on solution?

Regulatory documents require that unused or expired Bravecto S must not be thrown away in household garbage or disposed of via water courses, as the product is considered hazardous to aquatic life. Disposal must adhere to local regulatory requirements, which often involves consultation with a veterinary surgeon or pharmacist.

Q: What is the main action of Fluralaner on fleas and ticks?

Fluralaner is a systemic insecticide and acaricide, providing continuous activity against external parasites. Official information states that the onset of activity is rapid and persistent against fleas and ticks for the specified duration. The drug’s systemic mechanism requires the parasite to commence feeding on the host to initiate exposure to the active substance.

Q: What is the latest age restriction for dogs?

Official safety data has been established for use in dogs aged eight weeks and older and weighing at least 2 kg (4.4 lbs). The product label does not specify a maximum age or an upper limit for older dogs.

Q: Can I split a tablet or an application tube if the dose is too strong?

Official rules specify that the oral chewable tablets must not be broken or divided. For the spot-on solution, the entire contents of the appropriate pipette must be administered.

Q: What should I do if my dog licks the spot-on solution after I apply it?

Bravecto S is formulated for topical use only, and oral ingestion should be avoided. Official warnings state that the dog should be prevented from licking the application site until it is dry. If accidental ingestion occurs, advice should be sought from a veterinary professional.

Q: What should I do if I accidentally get the solution in my eyes or on my skin?

If the solution contacts human skin, the affected area should be washed immediately and thoroughly with soap and water. Eye contact with the product should be avoided. If accidental exposure to the eyes occurs, the eyes should be rinsed thoroughly with water. Hands must be washed thoroughly with soap and water after the application is complete.

Q: How quickly does Bravecto S start working against fleas/ticks once applied?

According to the official product information, the onset of action is rapid. Studies show the drug starts killing fleas within 8 hours of attachment and ticks within 12 hours of attachment.

Q: Do I need a prescription from a vet to buy Bravecto S?

Yes, Bravecto S is classified as a veterinary prescription-only medicine. It can only be purchased and used by or on the order of a licensed veterinarian.

Q: Is it okay to bathe my dog immediately before or after applying the spot-on?

While the product is designed to maintain efficacy, some regulatory information advises that dogs should only be washed or shampooed three days after the treatment. Care should be taken to ensure the application site is fully dry before the dog is exposed to water.

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How should Bravecto S be stored and disposed of?

Official Storage and Disposal Instructions

All storage and disposal of Bravecto S (Fluralaner spot-on solution) must adhere strictly to the conditions specified in the official regulatory labeling.


Storage and Handling

The product must be kept out of the sight and reach of children and pets, and stored in its original packaging (outer carton) until immediate use to prevent accidental access. Do not refrigerate or freeze the solution, and protect it from light. The solution is highly flammable and must be kept away from sources of ignition, heat, and open flames. The official shelf life for the packaged product is typically 3 years.


Disposal

Unused or expired Bravecto S must not be disposed of in household waste or via water courses, as it is dangerous to aquatic life. Disposal must be performed in accordance with local regulatory requirements, often requiring owners to consult with a veterinary surgeon or pharmacist.

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

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