Mycoster 8%

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Mycoster 8%

Quick Facts

Property Description
Active Ingredient Ciclopirox
Form Medicated nail lacquer (8% concentration)
Pharmacological Class Broad-Spectrum Antifungal Agent
Origin Synthetic Agent (Hydroxypyridone Fungicide)
Route Topical

What Type of Medicine is Mycoster 8%?

Mycoster 8% is defined as a prescription medicine for topical application that functions as a specialized broad-spectrum antifungal agent. The active ingredient is Ciclopirox, which belongs to the unique pharmacological class of hydroxypyridone fungicides. This compound is a synthetic agent specifically engineered to possess potent activity against a wide range of dermatophytes and yeasts. Ciclopirox is utilized as a topical treatment for nail fungi.

Composition and Unique Lacquer Form

The medicine is specifically supplied as an 8% concentration of Ciclopirox in a medicated nail lacquer dosage form. This formulation is distinctive, as it represents a targeted approach to managing fungal nail infections, known as onychomycosis. The preparation is a single-entity product, containing only the Ciclopirox compound, often present as the Ciclopirox olamine salt, which aids in its ability to penetrate the nail. The lacquer formulation uses volatile solvents, such as ethyl acetate and isopropyl alcohol, which quickly evaporate to leave a durable film on the nail surface. This design ensures that the antifungal agent is delivered effectively through the tough nail keratin barrier, overcoming a major challenge in treating nail infections.

General Purpose of Ciclopirox Antifungal Therapy

The general therapeutic purpose of using this agent is to control the fungal infection and support the clearance of nail mycosis. The Ciclopirox compound achieves this by having a dual mechanism of effect that is both fungicidal (cell-killing) and fungistatic (growth-stopping). This comprehensive action provides a targeted approach to managing the fungal load and supporting the return of a healthy nail structure. The objective of therapy is the long-term control of fungal proliferation.

Regulatory References

  1. [PubChem]
  2. U.S. National Library of Medicine

What side effects are possible with Mycoster 8%?

Possible Side Effects and Safety Information

The safety profile for Mycoster 8% (ciclopirox) medicated nail lacquer is primarily characterized by localized reactions at the application site due to its very low systemic absorption following topical use.

Documented Adverse Reactions

Adverse reactions are classified according to frequency, based on reports collected by regulatory authorities:

  • Common Reactions (may affect up to 1 in 10 people):

    • Application site irritation
    • Erythema (redness)
    • Pruritus (itching)
    • Burning sensation
  • Uncommon Reactions (may affect up to 1 in 100 people):

    • Application site dryness
    • Exfoliation (skin peeling)
    • Nail discoloration
    • Rash
  • Frequency Not Known (cannot be estimated from the available data):

    • Contact dermatitis
    • Hypersensitivity reactions
    • Urticaria (hives)
    • Vesicles (blisters)
    • Nail disorder (e.g., changes in shape, texture)

Safety Restrictions and Limitations

Official regulatory documents define specific limitations for the use of this medicine:

  • Contraindication: The product is strictly contraindicated for individuals with known hypersensitivity to the active substance, ciclopirox, or any other component of the lacquer.
  • Population Exclusions: Use in pregnant or breastfeeding women and in children and adolescents under 18 years of age is not recommended due to a lack of sufficient clinical data regarding safety and efficacy in these groups.
  • Application Restrictions: Mycoster 8% is for external use only. It must be kept away from the eyes and mucous membranes and should not be inhaled. It is also classified as highly flammable and must be handled and stored accordingly.

Overdose and Emergency Response

Overdose Scope

The official labeling for this topical medication notes that its formulation leads to limited systemic absorption, meaning no specific systemic overdose symptoms are officially documented following over-application. Systemic toxicity is not expected from the intended use. The primary risk factor requiring action is the accidental ingestion of the lacquer solution. Regulatory guidance mandates symptomatic and supportive treatment and confirms that no specific antidote is known for Ciclopirox. No differential population-specific overdose notes are explicitly documented in the official labeling for this topical formulation.


Overdose Classifications (High-Level)

Based on the low systemic toxicity, the severity classification confirms that systemic overdose is not expected to be dangerous. The official regulatory constraint defines the urgent intervention scenario as severe acute exposure, such as accidental swallowing.


Resulting Overdose Structure

Official overdose statements:

  • Systemic overdose from topical application is not expected to be dangerous.
  • Seek emergency medical attention immediately or contact a poison control center if the medication has been accidentally swallowed.
  • Management is limited to symptomatic and supportive treatment.
  • No specific antidote is known for Ciclopirox overdose.

Connection to the overall overdose profile:

Official regulatory documents define the overdose profile by emphasizing the drug's low systemic exposure, which confirms that topical over-application poses minimal risk. The sole trigger for mandated urgent medical help is the non-topical exposure scenario of accidental ingestion. This official structure ensures emergency protocols are focused on administering supportive care following the swallowing of the product, as directed by national health authorities.

Therapeutic Uses of Mycoster 8%

What Mycoster 8% Treats: Main Uses and Benefits

Mycoster 8% is indicated for the localized management of Onychomycosis—fungal infections affecting the fingernails and toenails.

Quick Fact: Relief for Nail Dystrophy

Primary Therapeutic Focus

This topical antifungal is applied to address active fungal colonization in cases of mild to moderate disease. It is relevant for easing symptoms that interfere with daily functioning, such as pronounced nail thickening, discoloration, splitting, and onycholysis (nail separation). The treatment is considered a relevant, localized therapeutic option for patients, especially adults and the elderly, who cannot tolerate or prefer to avoid systemic medications.

Symptom Management and Support

Mycoster 8% helps to manage the structural damage associated with the infection. This supportive management assists with maintaining functional stability of the nail during symptomatic periods and may improve the nail's aesthetic appearance. It is generally used in clinical contexts where the infection is contained, and supports the patient during episodes of heightened discomfort.

Eligibility and Restrictions for Use

Mycoster 8% (Ciclopirox 8% nail lacquer) is a prescription medicine for topical use, and its eligibility is strictly defined by official regulatory documentation to ensure appropriate use.

Populations That Must Not Use This Medicine (Contraindications)

The medicine is contraindicated in individuals with a known hypersensitivity or allergic reaction to Ciclopirox or any of the other ingredients in the nail lacquer formulation.

Age and Condition-Based Eligibility

The medicine is indicated for use in adults. Its safety and effectiveness have not been established in pediatric patients under 12 years of age.

Special Population Official Regulatory Status
Immunosuppressed Patients Use has not been studied; the medicine is indicated for immunocompetent patients [1.7].
Pregnancy Category B. Use is only permissible if the potential benefit justifies the potential risk to the fetus [2.5].
Breastfeeding Caution should be exercised as it is not known if the drug is excreted in human milk [1.3].

Eligibility is further restricted to patients with mild to moderate onychomycosis of the fingernails and/or toenails, specifically without involvement of the lunula (nail matrix) [1.7]. Caution is also advised for patients with a history of insulin-dependent diabetes or diabetic neuropathy due to the required monthly removal of the unattached, infected nail [2.5].

What should I know about interactions with other medicines?

Interactions with other medicines and products

Ciclopirox 8% nail lacquer (Mycoster 8%) has a specific interaction profile due to its topical route of administration and minimal systemic absorption. Official regulatory documents indicate that significant interactions with systemically administered medicines are not expected.


Documented Interaction Status

Item Official Regulatory Documentation
Pharmacokinetic Interactions None documented. Minimal absorption and non-CYP450 metabolism mean no known significant interactions with systemic drugs that rely on liver enzymes or drug transporters.
Food, Alcohol, Herbal Products No known interactions with food, drinks, or herbal products are documented in regulatory labels.

Official Regulatory Restrictions

Official labeling mandates specific product and timing constraints:

  • Systemic Antifungal Agents: The concurrent use of this topical solution with systemic antifungal agents for onychomycosis is not recommended. This status is due to a lack of studies determining whether the topical lacquer might reduce the efficacy of the oral medicine.
  • Cosmetic Products: The application of nail polish, artificial nails, or other cosmetic nail products on the treated nail is prohibited for the duration of therapy.
  • Timing Restriction: The treated nail must not be washed, bathed, or exposed to water for at least 8 hours following application of the lacquer.

Mechanism of Action

How Mycoster 8% works

Mycoster 8% (ciclopirox) engages multiple, simultaneous mechanisms which affect the core regulatory systems of the target organisms, leading to the physiological consequences of growth inhibition and cellular necrosis.


Interfering with Cellular Energy and Replication

This domain covers the drug's effect on internal enzyme systems and essential nutrients, which results in a fungistatic physiological effect. The active ingredient acts as a chelating agent, binding to vital metal ions like Fe^3+ required by key metabolic enzymes for energy production and DNA/protein synthesis. Interference with these pathways impairs the organism's enzymatic processes necessary for growth, replication, and cellular repair.


Effects on Membrane Integrity and Structure

This domain describes the physical consequences of the drug's action, which results in a fungicidal physiological effect. The drug directly alters the structural integrity and permeability of the target organism's cell membrane. This structural damage causes the cell to become leaky, leading to the irreversible loss of internal components and contributing to cellular necrosis and the breakdown of the target population.

Dosage and Administration Information

Administration of Mycoster 8%

Mycoster 8% (ciclopirox 8% nail lacquer) is strictly for topical administration to the affected fingernails or toenails and the immediately adjacent skin. The medicine is applied once daily in a thin, uniform layer, preferably in the evening or at bedtime, directly over the entire nail surface. The regimen requires coverage of the entire nail plate, approximately five millimeters of surrounding skin, and the underside of the nail plate when it is separated from the nail bed. Daily applications are made over the previous coat throughout the week.


Procedural Schedule and Duration

The regimen dictates a weekly treatment cycle. Daily applications continue for seven days, and then the accumulated lacquer coating must be removed using a solvent, such as alcohol or a commercial nail lacquer remover, before the next application is applied. The treatment is generally considered part of a comprehensive management program, which frequently involves a healthcare professional performing the monthly removal (debridement) of unattached, infected nail material. Treatment is expected to continue for long periods, typically 9 to 12 months for toenails, or up to 48 weeks, until full mycological and clinical recovery is observed. The safety and efficacy for use exceeding 48 weeks has not been established.


Administration Constraints

To ensure proper administration, the treated area should not be washed for at least six to eight hours following application. Furthermore, the use of nail polish or other nail cosmetic products is restricted on the treated nails during the entire duration of therapy. Regarding specific populations, the safety and efficacy of Mycoster 8% have not been established in pediatric patients under 12 years of age.

Recent Clinical Evidence

Recent Clinical Evidence

Mycoster 8% is a medicated nail lacquer containing ciclopirox, an antifungal agent. Clinical research has primarily focused on its application for managing mild-to-moderate fungal infections of the nails, known as onychomycosis, especially those without involvement of the nail matrix.


Studies Evaluating Outcomes and Penetration

Research has explored the drug's role in subjects experiencing pain and its effectiveness in achieving mycological and clinical improvement. Ciclopirox demonstrates a broad spectrum of antifungal activity, including against common causative agents of onychomycosis, such as Trichophyton rubrum and Candida albicans.

  • Efficacy Rates: Trials spanning up to 48 weeks have investigated the rate of complete or clinical success. In various studies, the reported rate of mycological cure (clearance of the fungus) ranged from approximately 54% to over 90% (in comparative trials), depending on the definition and nail formulation used. The clinical success rate (reduction in the affected nail area) typically varies widely, with some studies reporting success in over 60% of patients.
  • Penetration: The nail lacquer formulation is designed to allow the ciclopirox concentration to increase significantly on the nail surface after application, which facilitates penetration into the nail keratin to reach the site of infection.

Safety Profile and Dosing Regimens

Standard safety assessments have been conducted to monitor potential side effects and adverse events associated with the use of the topical lacquer.

Side Effect Category Study Findings
Local Adverse Events Local skin irritation, such as mild redness (erythema) or temporary burning sensation around the application site, was the most commonly observed event.
Systemic Absorption Ciclopirox shows very low systemic absorption (typically less than 5% of the applied dose) following topical application to the nails.

Comparative studies have also explored alternative dosing schedules, finding that less frequent application (e.g., once weekly) may be similarly effective compared to more traditional regimens, offering a potentially more comfortable treatment application.

Key Studies & References Ciclopirox Topical Solution, 8% - Full Prescribing Information (Regulatory Monograph for Safety and Pharmacokinetics)

Frequently Asked Questions (FAQ)

Common questions about Mycoster 8% (FAQ)

Q: How quickly should I see results after starting Mycoster 8%?

It is important to understand that treating nail fungus is a prolonged process. According to official product information, it may take six months or longer before visible improvement is observed in the treated nail. The full recommended treatment duration may last 9 to 12 months, or until the nail has fully grown out and appears healthy.

Q: What is the difference between Mycoster 8% and other common anti-fungal nail treatments?

A primary difference is the active ingredient used. Mycoster 8% contains ciclopirox, which belongs to a specific family of drugs called hydroxypyridone antifungals. This classification helps healthcare professionals understand its unique mechanism of action compared to other topical antifungal agents available.

Q: Is it normal to feel a slight tingling or burning when applying Mycoster 8%?

Yes, regulatory documents list a burning sensation at the application site as a common adverse reaction. Experiencing mild, temporary tingling or local irritation is frequently reported. If these sensations become severe or persistent, review the product’s safety information or consult with a healthcare professional regarding side effects.

Q: What happens if I accidentally get Mycoster 8% on the skin around my nail?

The product is designed to be applied to the nail and the skin immediately adjacent to it. Contact with other areas of skin or mucous membranes should be avoided. If accidental contact with the eyes occurs, the product labeling suggests rinsing the area thoroughly with water.

Q: Are there any specific medicines or supplements that interact with Mycoster 8%?

Official documents state that no formal interaction studies have been conducted for this topical product. Due to its minimal absorption into the body, no significant interactions are expected with systemically administered medicines or supplements taken orally. This lack of known interaction also applies to food, alcohol, and herbal products.

Q: Can individuals with diabetes safely use Mycoster 8%?

Caution is specifically noted for individuals with insulin-dependent diabetes or diabetic neuropathy. This caution is noted because the treatment protocol often involves the monthly removal (debridement) of the unattached, infected nail material by a healthcare professional.

Q: Does the nail need to be filed before each application of Mycoster 8%?

Product information describes the need for the removal of loose nail material, usually coinciding with the weekly removal of the lacquer coating using a solvent. Before starting treatment, all loose parts of the diseased nail should be removed.

Q: How long does the Mycoster 8% lacquer take to dry after application?

The product should be allowed to air dry for approximately 30 seconds after application. It is also important not to wash the treated area for at least eight hours, which allows the medication time to properly penetrate the nail.

Q: Does Mycoster 8% cure the fungal infection, or just suppress it?

Clinical studies and product labeling indicate that the aim of treatment is mycological cure, which means the clearance of the fungus. The drug works through a dual action that is both fungicidal (cell-killing) and fungistatic (growth-stopping). Success rates for achieving a completely clear nail vary among patients, as reflected in the clinical trial data.

Q: How long does it take for the active ingredient in Mycoster 8% to penetrate the nail?

The lacquer formulation is specifically designed to allow the active ingredient, ciclopirox, to penetrate the tough nail keratin barrier. Studies have shown that after a single application, the active ingredient can penetrate the nail to a measurable depth, as noted in clinical summaries.

Q: Can Mycoster 8% be used on children's nails?

No, the medicine is only indicated for use in adults. The safety and effectiveness of Mycoster 8% have not been established in pediatric patients, which includes children and adolescents under 12 or 18 years of age, depending on the specific regulatory label.

Q: Is Mycoster 8% known to cause any long-term side effects?

Clinical trials for this product have primarily focused on a treatment period of up to 48 weeks (approximately 12 months). The safety and efficacy for use exceeding this duration have not been fully established. The most common side effects observed are mild, localized reactions at the application site.

Q: What is the difference in active ingredient between Mycoster and other antifungal lacquers?

The active ingredient in Mycoster 8% is ciclopirox. It is important to know that other topical nail treatments contain different active ingredients, such as amorolfine or efinaconazole, which work through different pharmacological mechanisms.

Q: Is there scientific research supporting the efficacy of Mycoster 8%?

Yes, official documentation confirms that clinical trials have been conducted for up to 48 weeks. These studies have shown that the product is significantly more effective than a vehicle (placebo) in treating mild-to-moderate fungal nail infections caused by common agents.

Q: How often should Mycoster 8% typically be applied?

According to official product information, Mycoster 8% is typically applied once daily in a thin, uniform layer. It is usually recommended to apply the lacquer in the evening or at bedtime.

Q: Is it possible to be allergic to Mycoster 8%?

Yes, it is possible. Official regulatory information states that the medicine is contraindicated (must not be used) in individuals who have a known hypersensitivity or allergic reaction to the active substance, ciclopirox, or any of the other ingredients in the nail lacquer.

Q: What happens if I miss an application of Mycoster 8%?

If you miss applying the lacquer, regulatory patient guides suggest applying it as soon as you remember. However, if it is almost time for your next scheduled application, you should skip the missed one. It is important not to apply more of the product to make up for a forgotten dose.

Q: Is it normal for the nail to look discolored or worse before it starts to improve with Mycoster 8%?

Some patients may observe changes in the nail during treatment. Regulatory documents list nail discoloration and nail disorder (such as changes in shape or texture) as potential uncommon adverse reactions that may occur while using the product.

Q: Is Mycoster 8% effective for ringworm on the skin near the nail?

Mycoster 8% is specifically indicated for the treatment of mild to moderate onychomycosis (fungal nail infection). While the product is applied to the skin immediately adjacent to the nail, its primary therapeutic indication, according to the label, is for the infection within the nail plate.

Q: What happens if I stop using Mycoster 8% before the recommended treatment time?

Treatment should generally be continued until full mycological and clinical recovery is complete, as determined by a healthcare professional. Discontinuing the medication prematurely carries a risk of the infection returning or relapsing.

Q: Is the 8% concentration the only strength available for Mycoster?

Mycoster is supplied as an 8% concentration of ciclopirox nail lacquer. While the active ingredient ciclopirox itself is available in other topical forms and strengths for different conditions, this specific product is packaged as an 8% solution.

Q: Is there any research on the relapse rate after using Mycoster 8%?

Clinical study summaries may include follow-up periods after treatment has ended to assess the long-term success. While specific relapse rates are not typically listed in the main drug labels, patients are monitored to determine the durability of the cure achieved.

Q: Does Mycoster 8% need to be applied to the entire nail or just the affected area?

Official instructions specify that the medicine must be applied in a thin, uniform layer over the entire nail surface. This application should also cover approximately five millimeters of the surrounding skin and the underside of the nail plate where it is separated from the nail bed.

How should Mycoster 8% be stored and disposed of?

Storage and Disposal Requirements for Mycoster 8% Nail Lacquer

The storage and disposal of Mycoster 8% (Ciclopirox Topical Solution, 8%) must adhere to specific regulatory mandates to ensure product stability and safety.


Official Storage Conditions

Detail Requirement
Temperature Store at controlled room temperature, below 25 C.
Light Protection Keep the bottle in its original outer carton.
Handling The solution is flammable; keep it away from heat and flame.
Container The bottle must be kept tightly closed after use to prevent solvent evaporation.
Child Safety Keep out of the sight and reach of children.

Disposal Instructions

Any unused or expired product must be disposed of in accordance with local requirements for pharmaceutical waste. Taking the medication to an authorized drug take-back program is often the recommended method for proper disposal.

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

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