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OSURNIA (veterinary)

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OSURNIA (veterinary)

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Method of action: Otologicals

Treatment option:

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 OSURNIA (veterinary)

Quick Facts

Property Description
Active Ingredients Betamethasone Dipropionate, Florfenicol, Terbinafine Hydrochloride
Form Otic gel (viscous suspension)
Pharmacological Class Triple combination anti-infective and anti-inflammatory agent
Target Species Dogs (Canine patients)
Origin Synthetic

Defining OSURNIA (veterinary): Classification and Form

OSURNIA is a veterinary, prescription-only fixed-dose combination (FDC) medication classified as a specialized triple combination anti-infective and anti-inflammatory agent for localized use in dogs. The medication is prepared as a viscous otic gel, which represents a key differentiation from traditional liquid ear drops due to its non-aqueous base and adherence properties. All active components are synthetic compounds combined into a single-dose preparation designed for aural administration. OSURNIA is clinically characterized by its unique single-dose administration design, featuring a sustained release necessary to manage complex canine ear canal conditions with fewer applications.

The Components of OSURNIA: Active Ingredients

The product's identity is defined by its three active ingredients: the potent corticosteroid Betamethasone Dipropionate, the amphenicol antibiotic Florfenicol, and the allylamine antifungal Terbinafine Hydrochloride. Florfenicol is a fluorinated synthetic analog developed exclusively for veterinary medicine. Terbinafine, belonging to the allylamine class, interferes with fungal cell membrane function. The co-delivery of a potent corticosteroid and two specific anti-infective agents in this fixed-dose combination is a core feature. These agents are suspended in an otic vehicle base, formulated as a gel to ensure effective drug contact time within the treated ear canal.

General Purpose of the Triple Combination

The general purpose of the triple combination in OSURNIA is to provide a comprehensive, single-product solution that targets the three primary factors involved in complex canine ear conditions: inflammation, bacteria, and yeast. The formulation utilizes the anti-inflammatory effect of the corticosteroid to rapidly alleviate symptoms of distress, such as pain and itching, which is a critical initial step in managing aural discomfort in dogs. Concurrently, the antibiotic and antifungal components work to address the microbial overgrowth. This combined action is designed to manage the multifaceted issue and promote the overall resolution of the aural condition, representing a common use scenario for veterinary ear preparations.

Regulatory References

  1. official labeling (DailyMed)
  2. NIH/MedlinePlus
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What side effects are possible with OSURNIA (veterinary)?

Possible Side Effects and Safety Information

Regulatory documents classify the safety profile of OSURNIA (veterinary) by the frequency and type of documented adverse reactions. The most frequently reported events are related to the site of application and are generally transient.

Frequency-Classified Adverse Reactions

Classification System-Organ Class Examples of Documented Effects
Common (1-10 in 100) Ear and Labyrinth Disorders Redness (erythema), pain, or discomfort at the application site.
Uncommon (1-10 in 1,000) Ear and Labyrinth Disorders Impaired hearing, or deafness (loss of hearing).

Serious Safety Considerations

Official labeling highlights the potential for serious adverse reactions that affect the hearing and balance systems. These include deafness, which has been documented as potentially irreversible, and vestibular dysfunction (balance/coordination issues). The risk of irreversible deafness is stated to be higher in older dogs.

Safety-Related Restrictions and Contraindications

Due to the components of the triple combination, specific constraints apply. OSURNIA is contraindicated in dogs with a known or suspected perforation of the tympanic membrane (eardrum) and in dogs with known hypersensitivity to the active substances. Additionally, the product is contraindicated for use in pregnant or lactating bitches. The corticosteroid component, Betamethasone Dipropionate, carries a documented risk of systemic absorption, which may lead to potential Endocrine Disorders, such as suppression of the hypothalamic-pituitary-adrenal (HPA) axis.

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Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for OSURNIA (veterinary) describes overdose based on findings from tolerance studies in dogs following administration of doses up to five times the recommended amount. Documented manifestations in the target species include local otic damage such as unilateral vesicle formation of the tympanic membrane and unilateral mucosal ulceration in the middle ear lining.


Physiological systems affected may include the endocrine system. Systemic effects observed after excessive administration include transient decreases in serum cortisol levels, a finding consistent with reversible adrenocortical suppression due to exposure to the corticosteroid component. The overdose information does not specify population-specific considerations for dogs with pre-existing conditions. There is no specific antidote known for the product, and management is generally symptomatic and supportive.


When Emergency Medical Help is Required

Regulatory documentation provides specific instructions for accidental human exposure. In the event of accidental human ingestion, seek medical advice immediately and show the physician the official product labeling. For accidental eye or skin contact, thorough washing with water is recommended. Accidental ingestion defines the critical, regulator-mandated trigger for seeking urgent external help.

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Therapeutic Uses of OSURNIA (veterinary)

What OSURNIA (veterinary) Treats: Main Uses and Benefits

OSURNIA is commonly used for managing conditions associated with acute or disruptive episodes of outer ear infection (otitis externa) in dogs, including the acute exacerbation of recurrent disease. The medication is indicated for managing the infection when it is caused by susceptible microbial strains: bacteria (Staphylococcus pseudintermedius) and yeast (Malassezia pachydermatis).

The medication is applied in contexts marked by increased discomfort or tension, which may include symptoms related to inflammatory or irritative states. It is relevant for easing symptom clusters that may become intense or disruptive, such as pronounced pain, severe itching (pruritus), redness, and swelling in the ear canal. This approach is often used during phases when symptoms become more noticeable and supportive relief is needed.

“The treatment supports the patient during difficult episodes by easing distress and contributes to improved comfort during the acute symptomatic phase.”


Quick Fact: Supportive Management of Aural Discomfort
Primary Use Otitis Externa
Symptom Focus Pain, Pruritus, Swelling
Microbial Focus Staphylococcus and Malassezia
Core Benefit Helps ease the overall symptom load

Regulatory References

  1. European Medicines Agency (EMA) therapeutic overview
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Eligibility and Restrictions for Use

Who Can and Cannot Use OSURNIA (Veterinary)?

OSURNIA is strictly limited to dogs and is contraindicated for several specific populations as defined in official regulatory labeling.

Non-Eligibility and Contraindications

The medicine must not be used in dogs with a perforated eardrum or generalised demodicosis (demodectic mange). Use is also prohibited in dogs with known hypersensitivity to any of the active ingredients (Betamethasone Dipropionate, Florfenicol, Terbinafine Hydrochloride) or other corticosteroids. The product must not be used in cats or any species other than dogs.

Population Restrictions

Safety has not been established for use in puppies less than 2 months of age or dogs weighing less than 1.4 kg. The medicine is contraindicated for pregnant and lactating bitches, and should not be used in breeding animals.

Condition-Specific Restrictions Required Regulatory Status
Dogs with endocrine disorders (e.g., diabetes) Use with precaution
Dogs with impaired hepatic function Use with caution

These restrictions define the eligible patient population based on official regulatory documents.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The regulatory profile for OSURNIA establishes specific constraints regarding co-administration with other substances introduced into the ear canal or administered systemically. The primary regulatory restriction addresses the potential for additive systemic corticosteroid exposure due to the Betamethasone component.

Documented Interaction Patterns

Interacting Product Category Formal Regulatory Restriction Outcome Basis
Additional Corticosteroid Treatments Co-administration should be avoided. Risk of additive systemic effects, including suppression of adrenal function.
Ear Cleaners (Non-Saline Solutions) Compatibility has not been demonstrated. Procedural constraint on co-administration with products other than sodium chloride solution.

Co-administration with additional corticosteroid treatments, whether topical or systemic, must be avoided. This is a crucial constraint rooted in the potential for a pharmacodynamic interaction that can elevate overall corticosteroid load and increase the risk of systemic effects, such as adrenal suppression. The regulatory labeling further establishes a procedural constraint concerning otic product compatibility. The label explicitly notes that compatibility has not been demonstrated for ear cleaners other than sodium chloride solution, imposing a required caution regarding the simultaneous use of non-saline otic cleansers. No specific drug-drug, drug-food, or drug-supplement interactions are documented in the official prescribing information for this veterinary otic preparation.

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Mechanism of Action

The mechanism of action involves three distinct, complementary pharmacodynamic domains: suppression of inflammatory signal transduction, inhibition of fungal ergosterol biosynthesis, and inhibition of bacterial protein synthesis.

Action on Inflammatory Signal Transduction

This mechanism centers on the Betamethasone component, which acts as an agonist of the intracellular Glucocorticoid Receptor (GR). This interaction drives genomic processes that suppress the transcription of pro-inflammatory factors (e.g., NF-kappa B) and induce anti-inflammatory proteins. This cascade blocks the upstream production of mediators like prostaglandins and leukotrienes, leading to the physiological effect of suppressing localized vascular permeability and sensory nerve sensitization.

Blockade of Fungal Ergosterol Biosynthesis

The fungicidal action is achieved by Terbinafine, which causes direct molecular interference through non-competitive inhibition of the fungal enzyme Squalene Epoxidase. This specific enzymatic blockade halts the creation of essential ergosterol for the fungal cell membrane and results in the toxic accumulation of the precursor squalene. The physiological consequence is structural compromise, leading to a fungicidal effect against susceptible pathogens.

Inhibition of Bacterial Protein Synthesis

The antibacterial mechanism involves Florfenicol's specific binding to the bacterial 50S ribosomal subunit. This binding physically obstructs the peptidyl transferase step, which is vital for forming peptide bonds and elongating polypeptide chains. By arresting this process, the mechanism prevents susceptible bacteria from producing the necessary proteins for growth and replication, resulting in a bacteriostatic effect.

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Dosage and Administration Information

OSURNIA otic gel is a prescribed therapy administered exclusively via the auricular (otic) route by a veterinary professional in a clinical setting. The treatment protocol is structured as a two-dose, fixed-schedule regimen. Each application consists of one full dose (one single-use tube) instilled per affected ear(s). The full course requires a second administration precisely 7 days after the initial dose.

Specific procedural conditions govern proper use. Before administering either dose, the veterinarian must first verify that the tympanic membrane (eardrum) is intact. For the initial application only, the external ear canal must be cleaned and dried to optimize the product's contact. Immediately after instillation, the base of the ear should be gently massaged to help distribute the viscous gel throughout the canal.

A critical element of the protocol involves post-administration care: the ear canal must not be cleaned for 45 days following the first dose. This restriction is necessary to ensure the prolonged adherence and effect of the otic gel. Regarding specific populations, the product is not intended for use in pregnant, breeding, or lactating animals, and its safety has not been established in dogs less than two months of age or weighing less than 1.4 kilograms.

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Recent Clinical Evidence

Overview of Clinical Trials

OSURNIA is a veterinary product containing a combination of florfenicol (an antibiotic), terbinafine (an antifungal), and betamethasone acetate (a corticosteroid). Clinical trials have focused primarily on its use for the treatment of acute otitis externa and acute exacerbations of recurrent otitis externa in dogs, specifically when associated with Staphylococcus pseudintermedius and Malassezia pachydermatis.

Key studies include randomized, controlled field trials that evaluated the product's effectiveness following a two-dose regimen, administered seven days apart. In one large study involving client-owned dogs with otitis externa, the rate of clinical success (defined by a Total Clinical Score of 0, 1, or 2) on Day 45 was significantly higher in the treatment group compared to the placebo (vehicle) group.


Efficacy and Quality of Life Outcomes

Comparative studies have been conducted comparing the two-dose, veterinarian-administered gel to daily, owner-administered topical suspensions. These studies assessed improvement using standardized scoring systems like the Otitis Index Score (OTIS-3).

Findings indicated a statistically similar overall clinical success rate between the two treatment types when evaluated several weeks after the final dose. However, some research noted a significantly greater and more rapid improvement in both dog and owner quality of life (QoL) scores for the group receiving the two-dose veterinarian-administered gel, particularly in the initial week of the study, which was suggested to be related to enhanced compliance and reduced owner burden.


Reported Adverse Events

Common adverse reactions reported in field studies and post-approval experience following the use of OSURNIA include vomiting, elevated liver enzymes (such as Alkaline Phosphatase), and hearing decrease or loss. The product contains a corticosteroid component, and studies have noted that betamethasone absorption can lead to a measurable, transient decrease in serum cortisol levels, which is consistent with its pharmacologic action.

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Frequently Asked Questions (FAQ)

Common questions about OSURNIA (veterinary) (FAQ)


Q: How long does OSURNIA typically stay active in the dog's ear?

A: Official dosing protocol indicates that the ear canal must not be cleaned for 45 days following the first application. This long-term restriction is necessary to ensure the prolonged adherence and effect of the otic gel within the ear.

Q: Is it a problem if some of the OSURNIA gel leaks out of the ear?

A: In clinical studies, the presence of the product may cause transient wetness on the inner and outer ear flap (pinna) after application. Official product information describes this observation as being attributed to the medicine's presence and is not described as a clinical concern in regulatory documents.

Q: Why does the product come in individual tubes instead of a multi-dose bottle?

A: The product is provided in a pre-measured, single-use tube because the protocol is a fixed-schedule regimen that requires the administration of one full dose per affected ear. This single-use packaging is intended to support the accurate administration of the fixed dose.

Q: Can a dog swim after receiving the OSURNIA application?

A: The ear canal must not be cleaned for 45 days following the first dose. This restriction is necessary to ensure the prolonged effect. Official guidance does not specifically address swimming, but it restricts cleaning or introducing substances into the ear during this period.

Q: Why is it described as a 'prolonged-release' formula?

A: Official clinical pharmacology information explains that the gel formulation dissolves in ear wax and is then slowly eliminated from the ear mechanically. This unique formulation property is the basis for its description as a sustained or prolonged-release application.

Q: How soon after the first dose do most owners notice an improvement?

A: Clinical studies indicate the maximum clinical response was seen 21 days after the second dose (Day 28). While study results noted improvement in quality of life earlier, the time to maximum effect is described in the label as 28 days.

Q: What kind of studies support the two-dose treatment plan for OSURNIA?

A: The specific two-dose regimen, administered seven days apart, is supported by randomized, controlled field trials that specifically evaluated the product's effectiveness following this two-dose protocol.

Q: Why is OSURNIA applied by a vet and not given to owners to apply at home?

A: Administration by a veterinary professional is required due to the need to verify the eardrum is intact before administering the medicine. The required veterinary application is intended to manage potential hazards, including minimizing the risk of accidental ocular exposure.

Q: What is the difference between OSURNIA and Claro/Otomax/Mometamax?

A: OSURNIA is officially described as a triple combination anti-infective and anti-inflammatory agent. Its identity is defined by its three active ingredients: the antibiotic florfenicol, the antifungal terbinafine, and the corticosteroid betamethasone acetate.

Q: Will OSURNIA interfere with my dog's flea and tick medicine?

A: Official regulatory prescribing information states that no specific drug-drug, drug-food, or drug-supplement interactions are documented in the official prescribing information for this veterinary otic preparation.

Q: Does OSURNIA affect the balance or coordination of the dog after application?

A: Official adverse reaction documents list vestibular dysfunction (issues with balance and coordination) as a potential serious adverse reaction that has been documented post-approval, along with potential deafness or hearing loss.

Q: What kind of follow-up is described as standard after using OSURNIA?

A: The required follow-up is the second administration precisely 7 days after the initial dose. This second application is a required component of the approved treatment course.

Q: What is the main difference between OSURNIA and other common ear drops for dogs?

A: Official documentation describes the product as a viscous otic gel, which is a fixed-dose combination of three active ingredients. It is designed as a two-dose, prolonged-release regimen for administration by a veterinarian.

Q: Does OSURNIA work for yeast infections in dog ears?

A: Official labeling indicates that OSURNIA is approved for the treatment of acute otitis externa when associated with susceptible strains of yeast, specifically Malassezia pachydermatis.

Q: Can OSURNIA be used for ear mites?

A: The product is indicated for otitis externa associated with specific bacteria and yeast. Official regulatory documents do not include treatment for ear mites (O. cynotis) as an approved use.

Q: Why does the core research focus on specific types of bacteria and fungi?

A: The clinical studies and product indications focus on specific strains of bacteria (Staphylococcus pseudintermedius) and yeast (Malassezia pachydermatis). Official documents indicate this is because these organisms are the most common infectious agents associated with canine otitis externa.

Q: Is it true that OSURNIA contains ingredients used in human medicine?

A: Two of the active components, Betamethasone (a corticosteroid) and Terbinafine (an antifungal), are recognized compounds used in both veterinary and human medicine. Florfenicol is a synthetic analog developed exclusively for veterinary medicine.

Q: What is the purpose of the long applicator tip on the OSURNIA tube?

A: The applicator features a flexible, soft tip designed to facilitate the complete and thorough administration of the gel deep into the ear canal. The tip is designed to facilitate thorough administration, which is described as being comfortable for the patient.

Q: If I accidentally store OSURNIA too warm or too cold, is it still usable?

A: Official storage conditions require the product to be kept in a refrigerator (2 degree C to 8 degree C) or temporarily stored up to 25 degree C for a maximum of three months. The official product information does not address the product's integrity or usability if it has been stored outside of these specified conditions.

Q: What is the likelihood of a dog experiencing a severe reaction to OSURNIA?

A: Official safety documents classify less severe side effects as Common (1-10 in 100) or Uncommon (1-10 in 1,000). Severe reactions, such as irreversible deafness and balance issues, are documented as Serious Safety Considerations in official labeling, and reports have been received, particularly concerning older dogs.

Q: What is the definition of 'prolonged ear treatment' in the context of OSURNIA?

A: This term refers to the product's ability to maintain its effect within the ear canal for an extended period (up to 45 days) following the two-dose administration, based on its specific prolonged-release formulation.

Q: What if my dog is allergic to one of the main components of OSURNIA?

A: Official regulatory documents state that OSURNIA is contraindicated and its use is prohibited in dogs with a known or suspected hypersensitivity (allergy) to any of its active substances.

Q: How soon after finishing the OSURNIA doses can my dog resume its normal activities, like going to the groomer?

A: The only time-based restriction detailed in the protocol is that the ear canal must not be cleaned for 45 days following the initial application. This is the primary official constraint regarding post-administration activities that involve the ear.

Q: Are there environmental factors that might affect how OSURNIA works?

A: The prolonged action depends on the medicine dissolving in ear wax and being slowly eliminated. Factors that affect this mechanical process, such as removal of the ear wax, may influence the prolonged efficacy.

Q: Can OSURNIA be used at the same time as ear washes?

A: Regulatory documents explicitly state that compatibility with ear cleaners, other than a saline (sodium chloride) solution, has not been demonstrated. Additionally, cleaning the ear is restricted for 45 days following the initial application as part of the protocol.

Q: What are the most commonly reported temporary side effects of OSURNIA?

A: Official product information lists the most common reactions as those related to the application site, such as redness (erythema), pain, or discomfort. These reactions are generally classified as transient (temporary) in regulatory documents.

Q: Is it normal for a dog to shake its head a lot right after the OSURNIA application?

A: While the veterinarian will gently massage the ear to distribute the gel, head shaking is listed as a reported adverse event. Post-application restraint is sometimes mentioned in official literature as a way to minimize this reported adverse event and prevent accidental contact.

Q: Can the same OSURNIA tube be used for both of a dog's ears?

A: The official dosing protocol requires the administration of one full dose (one single-use tube) per affected ear. Therefore, if both ears require treatment, two separate, unused tubes are required for administration.

Q: Is it possible to overdose a dog on OSURNIA?

A: The product is a fixed, pre-measured dose. However, studies using exaggerated doses (five times the recommended amount) did result in signs of systemic absorption and visible clinical signs.

Q: Are there any long-term effects described in official documents after repeated use?

A: Official product warnings acknowledge that prolonged and intensive use of any topical corticosteroid (one of the components in this product) carries a documented potential risk of systemic effects, such as suppression of adrenal function.

Q: Does the package insert mention any interactions with common dog supplements like glucosamine?

A: Regulatory documents state that no specific drug-drug, drug-food, or drug-supplement interactions are documented in the official prescribing information for this veterinary otic preparation.

Q: Why is it important that the veterinary professional applies the medicine?

A: Veterinary application is required to ensure the correct technique and for safety. The vet must verify the eardrum is intact before treatment, and this method helps minimize accidental ocular exposure for the owners.

Q: Can OSURNIA be used if the dog has a pre-existing health condition?

A: Official labeling requires the use of the product with caution in dogs with certain pre-existing conditions. These include endocrine disorders and impaired hepatic function (liver problems).

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How should OSURNIA (veterinary) be stored and disposed of?

Official Storage and Disposal Requirements

Regulatory agencies require OSURNIA ear gel to be stored in a refrigerator at 2 °C to 8 °C for its primary shelf life. However, the product is permitted to be stored temporarily at temperatures up to 25 °C for a maximum period of three months to facilitate administration.

Storage Classification Requirement
Primary Storage Refrigerator (2 °C to 8 °C)
Temporary Storage Up to 25 °C for le 3 months
Child Safety Keep out of the sight and reach of children
Disposal Must be in accordance with local environmental requirements

Disposal must adhere to local environmental regulations, and the product must not be discharged into drains or water courses due to its documented environmental hazard classification. The product is intended for single use.

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

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