Dermax

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Dermax

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 Dermax

Property Description
Active ingredient Terbinafine Hydrochloride
Form Oral tablet, Cream, Topical Solution
Pharmacological class Antifungal Agent (Allylamine)
General purpose To eliminate susceptible fungal organisms
Origin Synthetic derivative

What is the Active Ingredient and Class of Dermax?

Dermax is a medication whose identity is centered on the active component, Terbinafine Hydrochloride, which is a synthetic compound classified as an Antifungal Agent. The drug is categorized specifically as an Allylamine derivative within the broader Antimycotic Drug class. The efficacy of Terbinafine has been clinically recognized for achieving mycological cure. Terbinafine is recognized by the World Health Organization (WHO) as an essential medicine due to its established efficacy against a range of dermatophytoses. The inclusion of Terbinafine on its Essential Medicines List confirms its established importance and effectiveness in global health.

What Forms of Dermax are Available for Use?

Dermax is available in multiple dosage forms to facilitate either topical or systemic use, depending on the delivery required. The medication exists as an oral tablet for internal absorption via the systemic route and as a cream or topical solution for external application on the skin. This dual availability is key to its therapeutic utility, enabling healthcare providers to select a form appropriate for the location of the fungus. For example, the topical preparations are typically positioned for localized skin use, while the systemic oral tablet is reserved for deeper-seated or widespread infections. The availability of both systemic and topical forms means that treatment can be tailored to the exact location of the infection.

How Does the Allylamine Class Provide a Fungicidal Effect?

The core benefit of the Allylamine class is its fungicidal action, meaning the drug actively kills the fungal organism rather than merely slowing its growth. This is achieved because Terbinafine acts as a Squalene Epoxidase inhibitor, a mechanism that disrupts the fungal cell structure. By blocking the synthesis of ergosterol, an essential building block, the drug compromises the cell's structural integrity, leading to rapid cellular failure and the elimination of the pathogen.

Regulatory References

  1. WHO Essential Medicines List
  2. Terbinafine - NIH LiverTox

What side effects are possible with Dermax?

Possible Side Effects and Safety Information

The safety profile for Dermax (terbinafine oral tablet) is structured by government regulatory documents based on the body systems affected and the frequency of reported adverse reactions. This classification ranges from very common to rare or not known.

Very common adverse reactions reported in official labeling include various gastrointestinal symptoms (such as nausea, diarrhea, dyspepsia, and abdominal pain) as well as rash, urticaria, and musculoskeletal pain (arthralgia, myalgia). Common effects include headache, taste disturbance (dysgeusia), and abnormalities in liver enzyme levels.

Serious Adverse Reactions and Safety Constraints

The regulatory safety profile documents rare but serious adverse reactions. These include severe hepatic failure (in some cases requiring liver transplantation or resulting in death), severe skin reactions (such as Stevens-Johnson syndrome and Toxic Epidermal Necrolysis), and serious hematologic disorders like pancytopenia and agranulocytosis.

Official labeling contains specific safety constraints. The oral tablet is contraindicated in individuals with pre-existing chronic or active liver disease. Use is not recommended in patients with severe renal impairment (creatinine clearance leq 50 mL/min). The label also notes that taste and smell disturbances, including loss, may be prolonged or permanent in some reported instances. Liver function testing is advised before initiating therapy, and treatment must be discontinued immediately if specific signs of liver injury, a progressive rash, or hematologic abnormalities appear.

Overdose and Emergency Response

Overdose and when to seek help

Overdose information for Dermax (Terbinafine Hydrochloride) is based exclusively on official government regulatory documents, detailing documented clinical presentations and mandatory emergency actions.


Documented Overdose Manifestations

Symptoms reported following acute overdosage of Terbinafine are typically associated with gastrointestinal and central nervous system effects. The officially documented manifestations include nausea, vomiting, upper abdominal pain, dizziness, and headache. Acute overdose has occurred with the ingestion of high doses, such as up to five grams.


Required Emergency Actions and Management

In all cases of suspected or confirmed overdose, regulatory instructions mandate the immediate need to seek immediate medical attention or contact emergency services.

Management of the overdose is defined by the absence of a specific counteracting agent. Official labeling states that no specific antidote is known for Terbinafine overdose. Therefore, treatment is symptomatic and supportive. Procedures such as gastric lavage or the administration of activated charcoal may be considered by medical professionals as measures to eliminate the drug, where appropriate.


This profile underscores that professional medical intervention and clinical monitoring are required for the management of an overdose event.

Therapeutic Uses of Dermax

What Dermax Treats — Main Uses and Benefits

Dermax (Terbinafine) is commonly used to manage fungal infections that are established deep within dense keratin structures, such as the nails (onychomycosis) and the hair and scalp (Tinea capitis). This systemic approach is relevant when the infection is deep-seated or affects tissues not easily reached by external application.

The medication is commonly used to help with infections involving structural damage, such as nail thickening, discoloration, and distortion, as well as skin conditions including Tinea pedis, Tinea corporis, and Tinea cruris. It is generally applied across therapeutic domains where additional symptomatic support is needed for extensive or persistent fungal infections.

“The treatment supports managing the progression of structural damage and assists with the clinical goal of mycological resolution.”

It is used for managing symptom clusters that may become intense or disruptive, contributing to improved comfort by easing pronounced symptoms like chronic itching (pruritus), severe scaling, burning, and fissuring. This helps maintain a sense of stability when symptoms are more noticeable and create noticeable physiological strain.


Quick Fact: Symptomatic Relief The medication is relevant for easing symptoms related to inflammatory or irritative states caused by dermatophyte fungi, supporting general comfort during symptomatic phases.

Regulatory References

  1. NIH DailyMed label for Terbinafine

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Dermax (Terbinafine) — official regulatory information

Eligibility Scope

  • Populations for whom use is allowed: Use is approved for adults.
  • Populations for whom use is contraindicated: The medicine is absolutely contraindicated in patients with chronic or active hepatic (liver) disease. It is also contraindicated for individuals with a known hypersensitivity or allergy to terbinafine or any excipients.
  • Populations for whom use is not recommended: Use is not recommended in patients with renal impairment (creatinine clearance less than 50 mL/min).
  • Age-related eligibility rules: Safety and efficacy for treating onychomycosis have not been established in pediatric patients, and use is generally not recommended for children under two years of age.
  • Pregnancy and lactation eligibility status: Use is not recommended during pregnancy unless the potential benefits outweigh the risks. Women should not breast-feed as the substance is excreted into human milk.
  • Eligibility-related restrictions: Use should proceed with caution in patients with pre-existing psoriasis or lupus erythematosus due to reports of possible exacerbation.

Eligibility Classifications (High-Level)

  • Eligibility severity classification: Absolute Contraindication (Liver Disease, Hypersensitivity), Not Recommended (Renal Impairment, Breastfeeding).
  • Regulatory basis: Based on official labeling from multiple governmental regulatory bodies.
  • Eligibility-context constraints: Eligibility is defined by organ function, allergy status, and age-group-specific data sufficiency.

Resulting eligibility structure

Official eligibility statements:

  • The medicine is absolutely contraindicated in patients with chronic or active hepatic disease.
  • Use is not recommended in patients with renal impairment or who are breastfeeding.
  • Safety for onychomycosis treatment has not been established in pediatric patients.

Connection to the overall eligibility profile: Governmental regulatory documents strictly define eligibility by establishing absolute contraindications based on liver function and allergy status. The profile then layers use limitations by classifying the status as "not recommended" for groups with organ impairment and where safety data is not established, such as for young children.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interactions with Dermax (Terbinafine) are primarily defined by its role as a strong inhibitor of the Cytochrome P450 2D6 (CYP2D6) isozyme, a classification based on regulatory documents. This activity reduces the clearance of certain co-administered medicinal products metabolized by this enzyme, leading to an increase in their systemic exposure. Substances affected include Tricyclic Antidepressants (such as Desipramine), Selective Serotonin Reuptake Inhibitors (SSRIs), certain Beta-blockers, and Class 1C Antiarrhythmics.

Conversely, the systemic exposure of Terbinafine itself is altered by co-administered CYP enzyme inducers and inhibitors. Co-administration with the CYP inhibitor Fluconazole is documented to significantly increase Terbinafine C max and AUC. Conversely, Rifampicin (a CYP inducer) substantially increases Terbinafine clearance by mathbf100%, resulting in reduced systemic exposure. A formal substance interaction exists with Caffeine, whose clearance is decreased by mathbf19% to mathbf21%. The use of oral Terbinafine is contraindicated in patients with chronic or active hepatic disease, which represents a formal restriction on administration based on the risk of compromised drug processing.

Mechanism of Action

How Dermax Works

The action of the active ingredient is focused on disrupting the metabolic processes required for fungal structural integrity, specifically by targeting the pathway responsible for the synthesis of its primary membrane sterol.


Inhibiting the Fungal Cell's Structural Production

This drug targets a specific fungal enzyme, squalene epoxidase, found in the fungal cell's endoplasmic reticulum. By acting as an inhibitor, the drug effectively blocks the conversion of squalene into the primary structural sterol ergosterol . This mechanism prevents the fungus from producing the essential building blocks of its cell membrane.


Dual-Action Cellular Disruption

The blockade of ergosterol synthesis causes a dual physiological effect. First, the resulting deficiency of ergosterol compromises the stability and function of the fungal cell membrane; simultaneously, the blocked substance, squalene, accumulates to highly toxic levels inside the cell. These two simultaneous mechanisms rapidly and irreversibly damage the cell membrane, resulting in cellular lysis (rupture).

Dosage and Administration Information

Administration and Dosing Schedule

Dermax (Terbinafine) is administered through the oral route for systemic therapy, primarily in the 250 mg tablet strength. The standard systemic regimen for adults is 250 mg taken once daily. The tablet may be taken with or without food, though consistency in daily timing is preferred. For pediatric use, 125 mg and 187.5 mg oral granules are available for specific indications, which require mixing the contents with a spoonful of soft, non-acidic food and swallowing immediately without chewing.


Duration and Special Use Considerations

The required duration of use varies depending on the infection site. For example, the treatment course is typically 6 weeks for fingernail onychomycosis and 12 weeks for toenail onychomycosis, while courses for skin infections like Tinea corporis may range from 2 to 6 weeks.


Procedural Rules and Restrictions

Specific parameters exist regarding constraints on use related to existing health conditions. Systemic use is not recommended in patients with chronic or active liver disease or in cases of severe renal impairment, generally defined as a creatinine clearance (CrCl) of 50 mL/min or less. Regarding missed timing, if the next scheduled dose is less than 4 hours away, the missed tablet should be skipped to maintain the established daily rhythm.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Dermax (Terbinafine)

This section summarizes the types of official research that have been conducted on Dermax (Terbinafine) formulations, detailing what the studies examined and what areas remain less studied, according to regulatory and scientific literature. Findings describe group patterns observed in studies and are not personal predictions.


Evidence for Use in Fungal Nail Infections (Onychomycosis)

The primary evidence for the oral tablet formulation in nail infections was derived from Randomized Controlled Trials (RCTs) and meta-analyses that included comparisons against inactive substances (placebo). Researchers studied adult patients with confirmed dermatophyte infections. Key monitored outcomes included mycological cure (clearance of fungus) and clinical cure (resolution of visible nail issues). Findings describe patterns observed in these studies when comparing the measured rates of mycological clearance between the Terbinafine-treated groups and placebo groups. Research exploring outcomes for non-dermatophyte molds or yeast is limited, as the bulk of the research focused on dermatophyte fungi.


Evidence for Use in Scalp and Hair Infections (Tinea Capitis)

Research has explored the use of the oral tablet for Tinea capitis, a scalp infection that was studied with systemic treatment, primarily evaluated in pediatric patients. Studies were designed to observe how measured outcomes varied against other treatments based on the specific type of fungal species causing the infection. Data for certain groups, particularly children younger than four years of age, remains insufficient. Findings were mixed when comparing outcomes based on the fungal species.


Evidence for Topical Use in Superficial Skin Infections

The research base for the cream and topical solution involves placebo-controlled trials conducted in adults and adolescents with localized skin infections like Athlete's foot. These short-term studies monitored changes in clinical signs and symptoms. Researchers also monitored mycological cure following a brief course of treatment, with studies reporting observed changes in symptoms soon after application began. Long-term outcomes for recurrence are not as extensively tracked as they are for nail infections.


Uncertainty and Limitations in Research

Research focusing on onychomycosis often involves long-term observation periods to assess the durability of the measured clearance. However, long-term effects are not fully established for all formulations and populations. Data for certain groups remain insufficient, particularly for patients with underlying conditions like severe diabetes. Comparative evidence is often lacking for less common fungal species, and some subgroup findings are uncertain due to small sample sizes. Research provides context but not individual predictions.

Key Studies & References

  1. Terbinafine Hydrochloride Tablet U.S. Prescribing Information (Reference for Study Designs and Outcomes)
  2. Oral antifungal therapy for onychomycosis: an evidence-based review (Meta-analysis for Efficacy and Follow-up)

Frequently Asked Questions (FAQ)

Common questions about Dermax (FAQ)


Q: How quickly can a person expect Dermax to start having an effect?

A: Studies and official information indicate that the medication begins to act on the fungal cells soon after treatment starts. However, Dermax accumulates in the skin and nails to eliminate the infection, and visible improvement is typically a gradual process. Visible results are often assessed following the completion of the recommended treatment course.


Q: Is it true that Dermax can interfere with birth control pills?

A: Official information indicates that Dermax is not generally expected to reduce the effectiveness of hormonal contraception, including oral birth control pills. However, some individuals have reported menstrual disturbances, such as breakthrough bleeding, when taking Dermax along with oral contraceptives. Unexpected changes are typically reported to the prescribing healthcare professional.


Q: Can Dermax be taken with common pain relievers like Tylenol (acetaminophen)?

A: No clinically significant interaction is typically reported between Dermax and common pain relievers like acetaminophen (Tylenol) in official regulatory documents. Dermax is primarily known to interact with certain medicines that are processed by the CYP2D6 enzyme, which does not commonly include acetaminophen.


Q: What should a person do if they feel dizzy after starting Dermax?

A: Dizziness is a possible side effect listed in official adverse reaction reports, particularly in postmarketing experience. The official labeling highlights that symptoms such as yellowing of the skin (jaundice), dark urine, or a progressive rash are associated with rare but serious adverse reactions, and these should be reported to a healthcare professional.


Q: Is it normal for a side effect of Dermax to go away after the first week?

A: Commonly reported side effects, such as stomach upset and headache, are often temporary and may be assessed for resolution as the body adjusts to the medication. However, official regulatory labeling notes that serious side effects, including taste and smell disturbances, may be prolonged or permanent in some reported instances.


Q: Does Dermax cause weight changes for most people?

A: Weight gain or loss is not listed as a common or very common side effect in the official regulatory documents for Dermax. However, official lists of adverse reactions do include loss of appetite (anorexia) as an infrequent report, which may be associated with weight loss.


Q: What if someone accidentally misses a dose of Dermax?

A: Official guidance describes that if a dose is missed, it can be taken as soon as it is remembered, unless the time for the next scheduled dose is less than four hours away. In that case, the missed tablet is intended to be skipped to maintain the established daily rhythm.


Q: Does Dermax interact with herbal remedies like St. John's Wort?

A: The manufacturer’s information does not typically include specific clinical trial data on Dermax and St. John's Wort. However, because St. John's Wort is a known enzyme inducer, regulatory bodies suggest there is a theoretical potential for it to reduce the amount of Dermax in the body. Information regarding the use of supplements and herbal products should be shared with the prescribing healthcare professional.


Q: Is Dermax the same type of medicine as [similar drug name]?

A: Dermax (Terbinafine) is officially classified as an Antifungal Agent and is specifically categorized as an Allylamine derivative. Other antifungal drugs, such as those in the Azole class, work through different mechanisms. This Allylamine classification defines how the drug acts to eliminate the fungal cell.


Q: Why do some people say Dermax caused them [minor, general side effect]?

A: Official regulatory documents track and report adverse reactions, which are possible side effects noted during trials or reported voluntarily after the drug is marketed. It is important to know that these reports do not definitively establish that the medicine caused the reaction, only that the two occurred together.


Q: How long does Dermax stay in the body after the last dose?

A: The active substance of Dermax is generally cleared from the bloodstream with an effective half-life of about 36 hours. However, the medication is known to accumulate in the skin and nails, where small amounts can remain for several weeks or months. This extended presence contributes to the medication’s antifungal action.


Q: Is Dermax considered a high-risk medication?

A: Official documentation details specific serious but rare risks, including severe liver failure and serious skin reactions. Due to these risks, the medicine has formal safety constraints, such as being contraindicated in patients with existing liver disease. Liver function testing is recommended before use.


Q: What kind of research has been done on Dermax?

A: Research has included large Randomized Controlled Trials (RCTs) primarily for the oral tablet in nail infections. Studies have also been conducted for pediatric patients with scalp infections and for topical use in skin infections. The bulk of the official evidence focuses on the effectiveness against specific types of fungal species.


Q: Are there any specific foods or drinks to avoid while using Dermax?

A: Official labeling states that the oral tablet may be taken with or without food. No specific foods or drinks are formally prohibited or required to be avoided while taking the medication. The drug is known to interact with certain other medicines, but generally not with food.


Q: What is the main difference between Dermax and a generic version?

A: A generic version of Dermax contains the identical active ingredient, Terbinafine. Generic drugs are required by regulatory bodies like the FDA to be bioequivalent, meaning they work in the same way, at the same dosage, and are absorbed at the same rate and extent as the original branded medication.


Q: Is Dermax habit-forming or addictive?

A: Dermax (Terbinafine) is not classified as a controlled substance by regulatory bodies. It is not documented in official labeling as being habit-forming or having a known potential for abuse.


Q: Why is Dermax sometimes not effective for every patient?

A: Official clinical trial data describes a range of outcomes, and effectiveness can vary among individuals. Factors such as the specific type of fungal species causing the infection and the location of the infection may impact the final treatment response.


Q: What happens if a person stops using Dermax suddenly?

A: Dermax is not associated with withdrawal symptoms upon cessation. However, if the full prescribed course is not completed, official guidance states that the fungal infection may not be fully eliminated and may return (recurrence). Completing the full duration of treatment is described as necessary to achieve clearance.


Q: Is it safe for teenagers to use Dermax?

A: The safety and effectiveness of Dermax for treating nail fungus have not been fully established in pediatric patients. Use in adolescents should be determined by a healthcare provider after a complete evaluation of the patient’s condition and treatment needs.


Q: What is the typical patient experience with starting Dermax?

A: The most commonly reported adverse reactions for patients starting Dermax include various gastrointestinal symptoms, such as diarrhea, upset stomach, and abdominal pain. Headache and temporary changes in taste are also reported as common experiences in official documentation.


Q: Are there specific tests a doctor must run before prescribing Dermax?

A: Official regulatory documents advise that patients should be assessed for pre-existing liver disease. Liver Function Tests (LFTs) are generally recommended before starting therapy with the oral tablet as part of the assessment for patient eligibility prior to starting treatment.


Q: Does Dermax have any official warning labels?

A: Official regulatory documents include prominent safety warnings regarding rare but serious events, including liver failure and severe skin reactions. The medicine is contraindicated in patients with active or chronic liver disease, and specific warnings are also in place regarding serious hematologic disorders.


Q: What is the consensus from clinical trials regarding the effectiveness of Dermax?

A: Clinical trials consistently demonstrate that Dermax is effective in achieving both mycological cure and clinical cure for its approved indications. The effectiveness is often described in terms of the high cure rates observed in study groups when compared to inactive treatments.


Q: What are the differences in how Dermax is used in other countries?

A: While the core drug substance and purpose are globally recognized, specific dosage forms, approved indications, and age-related restrictions for use may have minor variations between different national regulatory documents. This is determined by the specific governmental drug authority in each region.


Q: Does Dermax cause problems with sleep?

A: Official lists of adverse reactions include sleep disturbances, such as trouble with sleeping, in the less common or post-marketing experience categories. New or worsening sleep issues are typically shared with the prescribing healthcare professional.


Q: How do scientists describe the benefits of Dermax?

A: The benefits of Dermax are described by scientists primarily using objective endpoints from clinical studies. These include achieving 'mycological cure,' which means the elimination of the fungus, and 'clinical cure,' which refers to the resolution of visible signs of infection in the treated population.

How should Dermax be stored and disposed of?

How to Store and Dispose of Dermax (Terbinafine)

The official regulatory labeling defines specific conditions for storing and disposing of Dermax to ensure stability and safety.

Storage Requirements

Dermax, in both tablet and cream forms, must be stored at controlled room temperature, typically between 20 C and 25 C (68 F and 77 F). The oral tablets require mandatory protection from light and moisture. For the topical cream, the label specifically instructs Do not freeze.

Child Safety and Stability

All Dermax products must be kept out of the reach of children. The product should be stored in its original, tightly closed container. For certain topical creams, stability is limited to 28 days after first opening.

Disposal Instructions

Unused or expired Dermax must be disposed of according to local requirements. Federal guidelines recommend utilizing community drug take-back programs. If a take-back option is unavailable, the medicine must be prepared for safe household trash disposal by mixing it with an undesirable substance before discarding. The medicine should not be flushed down the toilet.

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

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