Otomax-G

Quick links to important sections

Otomax-G

Treatment option:

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 Otomax-G

Property Description
Active ingredients Lidocaine Hydrochloride, Phenazone
Form Otic solution (Ear drops)
Pharmacological class Local Analgesic / Anti-inflammatory for Otological Use
Common purpose Symptomatic relief of localized pain and inflammation in the ear
Origin Synthetic, fixed-dose combination

What Type of Medicine is Otomax-G?

Otomax-G is defined as a specialized otological preparation formulated as a synthetic, fixed-dose combination drug for topical administration into the ear. Its classification places it within the high-level therapeutic group of local analgesic and anti-inflammatory agents for otological use. The specific combination of a local anesthetic and a pyrazolone derivative is recognized for its targeted application in managing acute aural symptoms. As an otic solution, the preparation is engineered for direct, localized application, which is a key differentiator from oral systemic analgesic therapies.

Composition: Active Ingredients and Dual-Action Strategy

The formulation of Otomax-G is based on the interaction of two principal active ingredients: Lidocaine Hydrochloride and Phenazone. Lidocaine is classified as a potent local anesthetic of the amide group, used to stabilize nerve membranes and block pain signal transmission. Phenazone functions as a non-opioid analgesic and a localized anti-inflammatory agent. This dual-action strategy is designed to ensure that both the perception of pain and the underlying inflammatory process are addressed simultaneously through a single, fixed-dose composition.

General Purpose of this Otological Solution

The general purpose of this otic solution is to provide localized symptomatic management against acute aural discomfort. This preparation is intended to provide relief of pain and improvement of inflammation. The preparation's utility is centered on offering targeted relief by combining the numbing action of Lidocaine Hydrochloride with the inflammation-mitigating effect of Phenazone, thereby easing localized discomfort and swelling in the ear structure.

What side effects are possible with Otomax-G?

Possible Side Effects and Safety Information

Documented Adverse Reactions

The most significant and serious adverse reaction associated with this product is ototoxicity (inner ear damage), primarily linked to the gentamicin component. This can manifest as deafness or partial hearing loss and vestibular dysfunction (balance issues such as circling, head tilt, or rhythmic eye movements). While the hearing deficit is often reported as temporary, permanent hearing loss has been documented on rare occasions, particularly in sensitive or geriatric subjects. If signs of hearing or vestibular dysfunction are observed, the product should be discontinued immediately.

Less frequent systemic reactions, typically following prolonged use, overdosage, or ingestion, are related to the corticosteroid (betamethasone) component. These may include signs of adrenocorticoid overdosage (e.g., sodium retention, increased thirst/urination, and weight gain) and inhibition of endogenous steroid production upon withdrawal. Gastrointestinal effects like vomiting and diarrhea (sometimes bloody) have also been reported.

Safety Restrictions and Monitoring

  • Contraindications: This product should not be used in the presence of a known perforation of the eardrum due to the risk of inner ear damage and transmission of infection. It is also contraindicated in case of hypersensitivity to any of the components.
  • Concomitant Use: Concomitant use with other drugs known to induce ototoxicity should be avoided.
  • Exposure-Related Risk: Use of the recommended doses beyond 7 days may result in delayed wound healing. Topical application for prolonged periods to large wounds or denuded skin can increase the risk of systemic gentamicin toxicity, especially in patients with renal impairment.
  • Fetal Risk: Administration of corticosteroids during pregnancy has been associated with congenital anomalies and may precipitate premature parturition.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for an overdose of this otic solution is structured around the potential for systemic absorption of the active components, primarily Lidocaine, which can lead to severe toxicity. Systemic exposure is a risk if the medication is accidentally ingested or applied to a compromised eardrum.

Documented Overdose Manifestations Regulator-Mandated Action
Initial signs may include a metallic taste, numbness of the mouth and tongue, drowsiness, or confusion. Seek immediate medical attention upon the recognition of any signs of systemic toxicity or suspected overdose.
Severe CNS toxicity is marked by convulsions and seizures. Contact emergency services is the required action for the onset of life-threatening symptoms, such as circulatory or respiratory distress.

Severe Outcomes and Monitoring Requirements

A severe overdose carries the documented risk of profound cardiovascular depression, potentially leading to hypotension, respiratory arrest, and cardiac arrest. Due to these life-threatening outcomes, continuous hospital monitoring is necessary until symptoms have fully resolved. Management is defined by supporting vital functions, including establishing adequate oxygenation and ventilation, as no specific chemical antidote is known. Regulatory documents also note that particular vigilance is required for young children due to their increased susceptibility to systemic toxicity.

Therapeutic Uses of Otomax-G

Otomax-G is relevant for symptomatic relief applied in contexts marked by increased discomfort and tension within the ear structure. The medication is commonly used across conditions presenting with acute episodes, such as congestive acute otitis media, pain associated with barotrauma otitis, and phlyctenular viral otitis (viral bullous otitis).

The primary therapeutic benefit may assist with managing symptoms related to physical discomfort and inflammatory states. Applied during phases when symptoms become more noticeable, it contributes to easing the overall symptom load.

“This preparation supports the patient during difficult episodes, contributing to easing the distress caused by acute, localized symptoms.”

The solution is applied in clinical settings that involve acute or unstable symptom patterns, relevant when supportive symptom management is appropriate. It plays a role in managing symptom clusters that may become intense or disruptive, including symptoms related to physical discomfort and symptoms related to inflammatory or irritative states. This focus helps maintain a sense of stability when symptoms are more noticeable.


Quick Fact: Relief for Acute Ear Pain

  • Target: Acute Otalgia and localized inflammation.
  • Benefit: Provides supportive relief, assisting with maintaining functional stability during symptomatic episodes.

Regulatory References

  1. Rwanda Food and Drug Authority Summary of Product Characteristics

Eligibility and Restrictions for Use

Official Eligibility and Non-Eligibility Rules

Eligibility for Otomax-G (Phenazone/Lidocaine otic solution) is strictly defined by regulatory documents, focusing primarily on the structural integrity of the ear and known allergies. The medicine is suitable for use in adults and children.

Eligibility Scope Regulatory Status
Populations for Whom Use is Allowed Adults and children (pediatric use is generally established, though caution is advised for infants under 3 months).
Pregnancy and Lactation Can be used, if necessary; systemic exposure is anticipated to be negligible under normal conditions of use.
Populations for Whom Use is Contraindicated Individuals with tympanic perforation (ruptured eardrum) of infectious or traumatic origin.
Allergy History Individuals with known hypersensitivity to the active substances (Phenazone or Lidocaine Hydrochloride) or any excipients.

Eligibility-Related Restrictions and Cautions

Use is prohibited if the tympanic membrane is compromised, as this may allow the solution to enter the middle ear, risking adverse effects on middle ear structures. Therefore, a regulatory precaution requires that the eardrum be confirmed as intact before administration.

Caution is formally advised for certain susceptible populations, including infants under 3 months of age and patients with specific metabolic conditions like G6PD deficiency, due to a very low potential risk related to local anesthetics. Additionally, athletes should be aware that one of the active ingredients may result in a positive anti-doping test.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Otomax-G (a fixed-dose combination of Phenazone and Lidocaine otic solution) is characterized by a definitive finding of no clinically significant interactions with other medicinal products. This classification is explicitly documented in official government labeling.

Pharmacokinetic and Pharmacodynamic Status

Regulatory authorities state that the systemic absorption of the active ingredients, Lidocaine and Phenazone, is negligible when the product is administered topically into the ear, provided the tympanic membrane is intact. This minimal systemic exposure provides the pharmacokinetic basis for the lack of interaction data, effectively eliminating the risk of enzyme- or transporter-mediated metabolic interactions (such as those involving CYP pathways) that affect the exposure of co-administered systemic drugs.

Regulatory Restrictions and Prohibitions

The official labeling imposes no formal contraindicated combinations stemming from drug-drug interaction risk. No other medicinal products or substance categories are explicitly restricted for co-administration in the regulatory documents. Furthermore, the prescribing information does not require mandatory timing separation rules for administration with other medicines. Interactions with food, alcohol, or herbal products are also not documented in the official regulatory profile.

Mechanism of Action

How Otomax-G Works: The Dual-Action Mechanism

Otomax-G functions through a localized, synergistic approach, targeting both the electrical transmission pathway and the biochemical production of inflammatory mediators. This strategy utilizes two distinct mechanistic domains to produce a coordinated local physiological effect.

Blocking Nociceptive Signal Conduction

This domain is defined by the action of Lidocaine, which directly targets and blocks Voltage-Gated Sodium Channels (Nav channels) on sensory nerve endings. By preventing the influx of sodium ions, this mechanism halts the electrical signaling sequence, which results in the stabilization of the nerve membrane and the functional interruption of afferent sensory signals.


Suppressing Localized Inflammatory Cascade

The second domain involves Phenazone as a non-selective inhibitor of Cyclooxygenase (COX) enzymes. This molecular interference modifies the Arachidonic Acid Cascade, thereby reducing the local biosynthesis of Prostaglandins. This action limits the chemical factors that contribute to the sensitization of local nociceptors and vascular changes.


Mechanistic Synergy and Physiological Outcome

The combination creates a complementary cascade: the immediate electrical blockade provided by Lidocaine is accompanied by Phenazone’s action of modulating localized chemical signaling. This coordinated action addresses both the conduction of the afferent signal and the generation of the local chemical stimulus.

Dosage and Administration Information

How to Use Otomax-G Otic Ointment

Otomax-G (Gentamicin-Betamethasone-Clotrimazole) is an otic ointment or suspension intended for topical administration strictly into the external ear canal of dogs.

Administration Conditions and Preparation

Prior to initial application, the external ear canal must be thoroughly cleaned and dried to remove any debris or excessive exudate. Excessive hair surrounding the ear canal should also be removed (clipped). For the suspension formulation, the product bottle must be shaken well immediately before use.

Dosing Schedule

Administration is required twice daily (B.I.D.) for a total of seven consecutive days. The amount of medication administered is based on the dog's body weight:

Dog Weight Standard Dose per Ear (Drops)
Less than 30 lbs (or 15 kg) 4 drops
30 lbs or more (or 15 kg or more) 8 drops

*Note: Dosing specifications for larger package sizes (e.g., 215 g) may differ from the table above; always refer to the specific product's labeling.

Post-Application Procedure

Immediately following the instillation of the drops, the base of the ear should be massaged gently and thoroughly. This procedure is required to ensure proper distribution of the ointment or suspension throughout the ear canal.

Recent Clinical Evidence

Research evidence / Overview of studies for Otomax-G

Evidence for Use in Acute Otitis Media (AOM) Symptoms

The combination of ingredients in Otomax-G was evaluated in studies exploring how symptoms change over time during the acute, non-perforative phases of Acute Otitis Media. This research included Systematic Reviews and Randomized Controlled Trials (RCTs). These trials primarily compared the ear drops against a control (such as a placebo or usual care) and research examined patient-reported outcomes describing perceived discomfort.

The studies explored short-term symptom changes, with observation periods relevant in trials assessing episodic symptom patterns. Studies monitored changes measured during the study period for both the feeling of pain and the appearance of localized inflammatory signs on the eardrum. Research describes patterns observed in the studies related to outcomes describing episodic or acute changes over the initial hours and days of application.

Research in Other Acute Otitis Conditions

Research has explored the use of this otic solution in other localized conditions marked by functional limitations and periods of heightened symptoms. This includes symptoms related to otitis in influenza (viral bullous otitis) and the pain associated with barotraumatic otitis. The evidence structure for these specific conditions relies on the pharmacological activity of the drug’s components for localized discomfort, drawing from the same underlying principles studied in the AOM research.

Dedicated, focused research (such as large-scale RCTs) is less frequently cited in public scientific literature for these specific diagnoses. The evidence base for these specific indications is not as well-characterized as that for AOM, meaning fewer dedicated research studies were reviewed.

Populations Studied in Clinical Trials

The research examined diverse populations, including both children and adults. Specific age ranges of children have been studied, with many trials focusing on those over one year of age. Across all studies and indications, a consistent feature of the researched population is that patients had an intact tympanic membrane. The results apply only to the populations studied.

Duration of Study and Long-Term Follow-up

Studies exploring short-term symptom changes were monitored in research examining how symptoms change over time. The primary assessment of the rapid analgesic effect was observed in trials that monitored patients over short intervals. The overall follow-up durations were limited, typically aligning with the acute, short-term treatment period, which is generally 7 to 10 days. There is limited information for long-term outcomes or how the duration of use relates to sustained symptomatic patterns beyond this acute phase.

What Remains Uncertain in the Research Landscape

Several limitations are documented in the scientific literature. Sample sizes were modest in some studies, meaning the data should be viewed as preliminary for some subgroups. The common practice of using oral analgesics alongside the drops complicates the interpretation of the isolated findings. This research provides insight into short-term changes but highlights what is known—and what is still uncertain—about this fixed-dose combination.

Frequently Asked Questions (FAQ)

Common questions about Otomax-G (FAQ)


Q: What are the most commonly reported side effects of Otomax-G?

Official safety documents are primarily focused on highlighting the serious, though less frequent, adverse reactions like ototoxicity (inner ear damage). Information about the most common, localized, and transient reactions is typically available from detailed reports of clinical studies, and are generally considered less serious than the primary safety warnings.


Q: Is it common for people to feel a mild burning sensation after using Otomax-G?

Official reports for the components in this medication describe the possibility of transient, localized effects. This can include mild symptoms such as stinging, irritation, or temporary discomfort specifically at the application site.


Q: How quickly do people typically start noticing changes after using Otomax-G?

Research and studies examining this otic solution have focused on measuring changes in symptoms during the acute phase. The studies looked for evidence of the rapid analgesic effect and patterns of acute symptom changes over the initial hours and days following application.


Q: Is Otomax-G appropriate for use in children?

According to official eligibility rules, the medicine is described as suitable for use in both adults and children. However, a specific formal caution is advised for infants under 3 months of age.


Q: Is Otomax-G generally suitable for the elderly?

Official safety information notes a specific caution regarding use in elderly individuals. Permanent hearing loss has been documented on rare occasions, particularly in sensitive or geriatric subjects, indicating they may be a more susceptible population.


Q: What should be done if an adverse reaction is suspected while using Otomax-G?

The official safety information advises that if signs of a serious adverse reaction, such as hearing or vestibular dysfunction (balance issues), are observed, the official guidance is that the product should be discontinued immediately.


Q: Are headaches a known side effect of Otomax-G?

Official safety data for similar otic or topical antifungal agents have included headache in the list of less common or rare adverse effects. Patients should consult the full product information for a comprehensive list of known reactions.


Q: Can Otomax-G affect balance or cause dizziness?

Official documents list vestibular dysfunction, which involves balance issues such as circling or head tilt, as a serious adverse reaction. This risk is specifically linked to the gentamicin component of the medication.


Q: Do people typically experience temporary discomfort when first starting Otomax-G?

Official reports describe the possibility of transient, localized effects upon initial application. These temporary feelings of irritation or stinging are generally not considered the serious adverse reactions noted in the primary safety warnings.


Q: Is Otomax-G available over the counter?

Based on its official classification as a fixed-dose combination otic preparation with specific contraindications and required patient screening, this product is consistent with a prescription (Rx) status.


Q: Is Otomax-G known to cause hearing loss?

The safety information identifies the most significant adverse reaction associated with the product as ototoxicity (inner ear damage). This reaction can potentially manifest as deafness or partial hearing loss, which is why it must not be used if the eardrum is perforated.


Q: What happens if Otomax-G is accidentally used in the eye?

Official handling information advises that the eyes should be flushed with water immediately, and medical attention should be sought if irritation persists. This guidance applies to accidental use of similar topical formulations.


Q: Does Otomax-G contain pain relievers?

The formulation contains two ingredients with analgesic properties. Lidocaine is classified as a potent local anesthetic, and Phenazone functions as a non-opioid analgesic and localized anti-inflammatory agent.


Q: Is it necessary to warm the Otomax-G drops before use?

Otic administration guidelines for similar drops often suggest warming the drops prior to use. This is a suggestion often included in otic administration guidelines to help prevent a temporary vestibular reaction (a feeling of dizziness).


Q: Are there different strengths of Otomax-G available?

Official regulatory documents, such as the DailyMed entry, list the exact strength of each active ingredient (Gentamicin, Betamethasone, Clotrimazole) for the approved formulation. Generally, only one approved fixed-dose strength is detailed in official labeling.


Q: What are the signs that Otomax-G may not be working?

The official safety section advises that treatment should be discontinued if certain conditions arise, such as the overgrowth of non-susceptible bacteria, fungi, or yeasts, or if a local hypersensitivity reaction develops. These issues may suggest the desired effect is not being achieved.


Q: Can Otomax-G be used alongside other ear drops if they are prescribed for different issues?

The official safety section advises that concomitant (simultaneous) use with other drugs known to induce ototoxicity (inner ear damage) is to be avoided to prevent cumulative risk.


Q: Why do official documents mention the potential for long-term use concerns?

Official warnings exist because administration of recommended doses beyond the standard 7 days may result in delayed wound healing. The warning is grounded in the fact that prolonged use increases the risk of systemic gentamicin toxicity, particularly in patients with kidney impairment.


Q: Is Otomax-G known to interact with topical skin products?

The official regulatory profile states that the systemic absorption of the ingredients is negligible, and it imposes no formal restrictions regarding drug-drug interaction risk. While interactions with food, alcohol, and herbal products are not documented, the labeling does not formally address topical skin products.


Q: Does Otomax-G have any effect on the ear drum?

The product is strictly contraindicated (must not be used) if a known perforation (rupture) of the eardrum exists. This is due to the significant risk of inner ear damage and the potential for transmitting infection into the middle ear.

How should Otomax-G be stored and disposed of?

Official Storage and Disposal Requirements

Official regulatory information dictates specific conditions necessary for storing and ultimately disposing of Otomax-G (Lidocaine Hydrochloride/Phenazone Otic Solution) to maintain product stability.

Storage Conditions

Condition Type Requirement Based on Official Labeling
Temperature Does not require any special temperature storage conditions for the unopened product.
Protection Must be stored in the original package in order to protect the solution from light.
Stability The shelf life after first opening the bottle is restricted to 6 months.

Disposal Instructions

Unused or expired Otomax-G solution and any waste materials derived from it must be disposed of in accordance with local requirements for pharmaceutical waste. Following these local rules ensures proper environmental compliance and safe discarding of the medication.

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

Available in countries:

Equivalent of Otomax-G found in:

A-Z Index: