Fungin

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Medically reviewed

Rosario Oropesa

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 Fungin

Quick Facts

Property Description
Active ingredient Clotrimazole
Form Topical preparations (cream, solution), Vaginal inserts, Oral lozenges
Pharmacological class Azole Antifungal / Imidazole Derivative
General Purpose To counteract mycotic outbreaks
Origin Synthetic agent

What Type of Medication is Fungin (Clotrimazole)?

Fungin is a medication based on the active ingredient Clotrimazole, primarily classified as a synthetic antifungal agent. It belongs to the azole antifungal class, chemically defined as an imidazole derivative. This single active ingredient product is widely used for addressing a range of surface fungal concerns. Clotrimazole is a well-established agent used to stop the growth of various fungi. This confirms the medicine's core purpose is to address the underlying fungal presence across relevant patient groups.

Composition and Available Pharmaceutical Forms

The fundamental composition of this medicine is the compound Clotrimazole (C22H17ClN2), a substance recognized for its targeted action. This molecule is classified as an imidazole antifungal. As a broad-spectrum antimycotic, the medication is intentionally prepared in diverse dosage forms tailored for localized application. These include widely used topical preparations such as cream and solution, alongside specialized vaginal inserts/tablets and oral lozenges (Troche). This availability ensures efficient delivery via the topical, intravaginal, and oromucosal routes, leveraging pharmaceutical vehicles like a cream base or solid excipient matrix appropriate for the site of mycotic growth.

General Purpose and Mechanism of Antifungal Activity

The general purpose of Fungin is to serve as an intervention against mycotic outbreaks by providing direct antifungal activity. This action is rooted in the drug's fundamental mechanism of interfering with the integrity of the fungal cell membrane. Clotrimazole achieves this by inhibiting the biosynthesis of ergosterol, a crucial structural component of the fungal cell wall, thereby disrupting the organism's ability to grow, function, and survive.

Regulatory References

  1. U.S. National Library of Medicine
  2. MedlinePlus

What side effects are possible with Fungin?

Possible side effects and safety information

The safety profile for Fungin (Clotrimazole) is established based on official regulatory classifications, which organize potential adverse reactions by frequency and physiological system. For the common topical and vaginal forms, the most frequently documented adverse events are generally localized to the application site.

Regulatory documents classify reactions such as a burning sensation, stinging, pruritus (itching), and irritation as common adverse reactions. These local reactions are officially noted in labeling as occurring more frequently during the initial phase of treatment.

Less frequent adverse reactions are categorized into specific System-Organ Classes. These include Skin and Subcutaneous Tissue Disorders (e.g., blistering, peeling, erythema) and General Disorders at the Administration Site (e.g., pain, edema). Rare but serious safety concerns include the potential for systemic hypersensitivity reactions (severe allergic response), which may manifest with signs such as hypotension or syncope.

For the oral lozenge (troche) form, official labeling documents specific systemic safety considerations. These include Gastrointestinal Disorders (nausea, vomiting) and Hepatobiliary Disorders, which mandate caution due to the documented potential for elevated liver enzyme levels (serum AST). This particular safety constraint is acknowledged in the regulatory profile, establishing a need for observation related to liver function.

Overdose and Emergency Response

The official regulatory profile for Clotrimazole (Fungin) is structured around risks associated with accidental ingestion, as overdose from typical topical or vaginal application is generally not expected to be dangerous due to minimal systemic absorption.


Domain Official Regulatory Statements
Documented Manifestations Accidental ingestion may lead to gastrointestinal symptoms such as nausea, vomiting, diarrhea, and stomach cramping.
Systemic Risk The potential for systemic toxicity is recognized by official guidance that advises periodic assessment of hepatic function for individuals with high systemic exposure, such as from the oral lozenge form.
Population Notes Accidental ingestion in children under 2 years of age is a specific circumstance that requires immediate professional assistance.

Emergency Actions Mandated by Regulators

Urgent medical attention must be sought in all cases of accidental ingestion. Regulatory guidance requires calling a Poison Help Line (e.g., 1-800-222-1222 in the US) to receive professional assistance. Local emergency services (e.g., 911) must be contacted immediately if the following severe signs are present: collapse, seizure, trouble breathing, or if the individual cannot be awakened. Treatment for Clotrimazole overdose is generally supportive and symptomatic; no specific antidote is documented in official prescribing information.

Therapeutic Uses of Fungin

What Fungin treats: main uses and benefits

Fungin is indicated for the management of symptoms associated with common superficial fungal infections of the skin. This medication assists in providing targeted relief for the discomforting symptoms of these conditions, which typically include localized itching, burning, and irritation.

The therapeutic domain for Fungin primarily includes certain dermatophyte infections and cutaneous candidiasis. Clinicians often consider its use for managing symptoms of tinea infections, such as tinea pedis (athlete's foot), tinea cruris (jock itch), and tinea corporis (ringworm).

The main benefit for the patient is the mitigation of bothersome skin symptoms, which may assist in promoting comfort during the resolution of the underlying condition.


Quick Fact: Relief for Itching and Irritation


Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Fungin — Official Regulatory Information

This section outlines the eligibility and non-eligibility for using Fungin (Amphotericin B lozenge formulation) based strictly on authoritative government regulatory documentation.

Populations That Must Not Use Fungin (Contraindications)

Category Regulatory Status
Hypersensitivity The medicine is contraindicated in patients with a history of allergy to amphotericin B or any other component of the formulation.
Infection Type The lozenge form must NOT be used for the treatment of systemic fungal infections.

Populations Requiring Restricted or Conditional Use

Category Regulatory Status
Pregnancy Use is conditional (Category B3). It should be used only if the potential benefit justifies the potential risk to the fetus, as there are no adequate and well-controlled studies in pregnant women.
Lactation Caution should be exercised when prescribed to a nursing woman, as it is officially not known whether amphotericin B is excreted in human milk.

Summary of Eligibility Constraints

The regulatory profile strictly excludes individuals with a known hypersensitivity to the drug or its components from use. Eligibility is also confined by the site of infection, with the oral formulation being expressly contraindicated for treating any systemic fungal infection. Use in special populations, specifically pregnant and nursing women, requires a careful risk assessment by a healthcare professional due to limited available human data.

What should I know about interactions with other medicines?

The interaction profile for Fungin (Clotrimazole) is defined by substance incompatibility at the site of application and pharmacokinetic interference documented in official regulatory labeling.

Interactions Affecting Drug Exposure

Co-administration of the vaginal formulation with certain immunosuppressive agents, specifically oral Tacrolimus or Sirolimus, may result in a pharmacokinetic interaction that increases the plasma concentration of these co-administered medicines. This alteration in exposure necessitates careful observation for signs of potential overdosage of the immunosuppressant agent. For the oral lozenge formulation, a specific population consideration is noted: patients with hepatic impairment are required to undergo periodic monitoring of liver function tests due to metabolic constraints documented in the prescribing information.

Interactions Affecting Local Effectiveness and Devices

Official documentation also outlines restrictions tied to the local application of the vaginal form. Contact with the medication may damage the material of latex contraceptive devices, including condoms and diaphragms, thereby reducing their effectiveness. Consequently, the regulatory label restricts the use of these devices during treatment. Furthermore, other local products, such as tampons, douches, and spermicides, must not be used concurrently. A pharmacodynamic interaction is also documented where co-administration with Polyene antibiotics (e.g., Nystatin) or high concentrations of Dexamethasone may reduce the antifungal activity of Clotrimazole or the other antifungal agent.

Mechanism of Action

Fungin's core action is based on inhibiting a crucial enzyme within the fungal cell's structure-building pathway. Its mechanism involves disrupting the organism's ability to maintain cellular integrity and survive.

Targeted Inhibition of Fungal Cell Enzyme (CYP51)

Clotrimazole acts as a non-competitive inhibitor of the fungal enzyme Lanosterol 14alpha-demethylase (CYP51). By coordinating its imidazole nitrogen with the heme iron of the enzyme, Clotrimazole blocks a step in the fungal organism's metabolic cascade that is essential for its growth and structural maintenance.

Destabilization of the Cell Membrane and Function

By blocking CYP51, the drug prevents the biosynthesis of ergosterol, the primary sterol component of the fungal cell membrane. The absence of ergosterol and the resulting accumulation of toxic precursors (14alpha-methyl sterols) lead to the destabilization of the cell membrane structure. This process causes increased permeability and leakage of vital internal cellular contents, which results in a fungicidal (killing) or fungistatic (growth-stopping) action on the fungal organism.

Dosage and Administration Information

How Fungin is Used

Fungin (Clotrimazole) administration is defined by the pharmaceutical form and the target site of the infection, which specify the delivery route, dose, and frequency.


Official Administration Guidelines

Administration Route Standard Regimen and Duration Key Administration Technique
Topical (Cream, Solution) Apply a thin layer twice daily (morning and evening) for a typical course of 2 to 4 consecutive weeks. The application site must be clean and dry before use.
Intravaginal (Inserts) Either 100 mg once daily for 7 consecutive days, or a 500 mg single-dose regimen. Administer the insert at bedtime. Avoid concurrent use with internal feminine hygiene products.
Oromucosal (Lozenges) One 10 mg lozenge dissolved slowly in the mouth five times daily for 1 to 2 consecutive weeks. The lozenge must dissolve slowly in the buccal pouch and should not be chewed or swallowed whole.

Population-Specific Use

Clotrimazole is generally approved for topical use in children 2 years of age and older, and for oromucosal use in children 3 years of age and older. Due to its localized use, prescribing information does not typically specify complex dosage adjustments for hepatic or renal impairment.

These standardized instructions define the administration technique and duration, ensuring consistency with the established use protocol.

Recent Clinical Evidence

Fungin: Recent Clinical Evidence

Overview of Studies

The body of research on Fungin includes studies that range from early-stage investigations to large-scale, controlled trials. These studies were designed to characterize the compound and evaluate its role in the management of specified conditions.

Phase 1 and 2 Trials

Early-stage clinical trials focused on determining the maximum tolerated dose and assessing the initial safety profile. Research from early studies focused on how the compound affects receptors in the nervous system, and research has explored whether it may affect patient-reported symptoms. Findings from these studies informed the design for later, larger studies.


Phase 3 Efficacy Trials

Large-scale randomized controlled trials (RCTs) have been the primary source of data on this compound.

Symptom Reduction

Studies have investigated whether this medication may be associated with a change in the onset of symptom relief. Its effects were compared with standard treatments in several trials.

A large Phase 3 trial investigated changes in a primary symptom measure, with changes observed over a 12-week period. Research assessed whether the compound may be associated with changes in measures of physical function.

Long-Term Follow-up

Long-term studies have tracked participants from the Phase 3 trials to observe extended outcomes. These studies primarily focused on safety and tolerability over a period of 6 to 12 months. Outcomes regarding long-term change have been reviewed, though the primary endpoints for these follow-up studies remained focused on safety. A smaller, independent study assessed the drug's role in managing chronic symptoms.


Mechanism and Combination Studies

Research has also explored the underlying pharmacological processes.

Bioavailability

Studies evaluated whether the combination was associated with changes in bioavailability when compared to the active compound alone. This area of research focuses on absorption and drug delivery.

Refractory Conditions

Some research has considered the compound's potential use in conditions where other treatments have been unsuccessful (refractory pain). Research has considered its use for those with refractory pain.

This investigational approach was evaluated for its association with adverse events in comparison to older therapies. Adverse event reporting varied across most patient groups in the included studies. The incidence of discontinuations due to adverse events was documented across the trial phases.

Key Studies & References

  1. Clinical Practice Guideline for the Management of Candidiasis: 2016 Update by the Infectious Diseases Society of America (IDSA)

Frequently Asked Questions (FAQ)

Common questions about Fungin (FAQ)


Q: What types of fungal infections is Fungin officially approved to treat?

Official information indicates that the active ingredient, Clotrimazole, is indicated for the treatment of various mycotic infections.

This includes common conditions like ringworm (tinea corporis), jock itch (tinea cruris), athlete's foot (tinea pedis), vulvovaginal candidiasis, and oral candidiasis (thrush).


Q: Is Fungin a brand name drug, and is a generic equivalent available?

Fungin is a name associated with the active ingredient Clotrimazole.

Clotrimazole is widely available as a generic medicine, as well as being the active component in many other common brand-name products.


Q: Is Fungin used to treat both yeast infections and mold infections?

Official regulatory information describes Clotrimazole as being used to address infections caused by both yeasts (such as Candida) and dermatophyte/mold infections (such as those that cause tinea).

It is classified as a broad-spectrum antifungal agent.


Q: Are the gastrointestinal side effects, such as nausea or upset stomach, usually mild?

Regulatory labeling for the oral lozenge formulation notes that less serious gastrointestinal side effects may include nausea, vomiting, or upset stomach.

The full details of the frequency and severity for all adverse reactions are available in the official regulatory documentation.


Q: Are the side effects of Fungin generally mild?

Regulatory classifications describe the most common adverse reactions, such as burning, itching, or irritation, as localized to the application site, especially with topical use.

These local effects are officially noted in labeling as occurring more frequently during the initial phase of treatment. Other reactions are officially organized by frequency (common, uncommon, rare) in the regulatory safety profile.


Q: Does Fungin affect the effectiveness of hormonal birth control methods?

Official prescribing information indicates that the vaginal formulation may damage latex contraceptive devices, reducing their effectiveness.

Furthermore, studies indicate that some azole antifungals may increase the concentration of oral hormones in the body, which is a factor for professional oversight.


Q: What does official guidance say about using Fungin during pregnancy or while breastfeeding?

Official guidance notes that small amounts of the active ingredient may be absorbed systemically from topical or vaginal use.

The conditional use requires assessment of potential benefit versus risk by a healthcare professional, as it is officially not known if the drug is excreted in human milk.


Q: How quickly does Fungin start working after the first dose?

Official guidance notes that improvement in symptoms is often seen within the first three days of treatment, particularly with the vaginal formulation.

For skin infections, official documents recommend re-evaluation by a healthcare professional if no improvement is observed after the specified treatment duration.


Q: How long does it take for Fungin to reach its full effect in the body?

Regulatory pharmacologic data shows that peak concentration of the drug in the body can be reached approximately 24 hours after application of the vaginal cream.

Official information notes that the full clinical outcome is usually evaluated at follow-up after the course is completed.


Q: Can fungi eventually become resistant to the effects of Fungin?

Regulatory documents used for clinical trials acknowledge drug resistance as a phenomenon.

For instance, a history of resistance to Clotrimazole treatment is listed as an exclusion criterion in certain lozenge studies.


Q: Is it common to experience dizziness or headache while taking Fungin?

Official safety documents do not list dizziness or headache as common or isolated side effects.

Dizziness or syncope (fainting) is, however, listed as a potential symptom of a rare, serious systemic allergic reaction.


Q: Is there a potential for Fungin to cause changes in vision or altered taste?

Regulatory information for the oral lozenge form notes that a bad or unusual taste in the mouth is a reported less serious side effect.

Changes in vision are not typically listed in the adverse effect profile.


Q: Does Fungin interact with common over-the-counter pain relievers, like acetaminophen?

Pharmacokinetic data based on regulatory studies suggests that the body's breakdown (metabolism) of common over-the-counter pain relievers, such as acetaminophen and aspirin, may be decreased when combined with Clotrimazole.

This potential interaction is noted as a basis for professional oversight, although systemic absorption is often minimal with topical use.


Q: Are there known interactions between Fungin and herbal supplements or vitamins?

Official guidance from regulatory bodies generally advises that complementary medicines, herbal remedies, and supplements are not subject to the same testing as prescription drugs.

Regulatory sources suggest patients share information about all concurrent products with a healthcare professional.


Q: Does Fungin interact with any prescription medications that treat blood pressure or heart conditions?

Regulatory data from interaction databases indicates that Clotrimazole has the potential to interact with certain prescription medicines used to treat heart and blood pressure conditions due to shared metabolic pathways.

This interaction potential is a factor in professional oversight.


Q: Are there any known interactions between Fungin and blood thinning medications?

Regulatory drug interaction data indicates a potential interaction where the metabolism of some blood thinning medications may be decreased when combined with Clotrimazole.

This specific interaction is noted as a factor in professional oversight.


Q: Is it acceptable to use Fungin simultaneously with a topical antifungal cream?

Regulatory guidance for the lozenge form notes that patients receiving topical antifungal therapy to a different area of the body do not necessarily need to discontinue the treatment.

However, an interaction is documented with co-administration of Polyene antibiotics, which may reduce the effectiveness of one or both agents.


Q: Are there specific foods or beverages that official documents recommend avoiding?

Official regulatory sources mention that consuming grapefruit or grapefruit juice may increase the amount of the orally administered drug in the bloodstream.

This effect is due to how grapefruit affects certain metabolic enzymes, which is a factor for professional oversight.


Q: What is the general expectation for improvement while taking Fungin?

Official patient information advises that improvement should generally be noticed within the first few days of treatment.

If symptoms do not start to get better or if they get worse, official documents suggest professional consultation under those circumstances.


Q: What is the recommended official guidance regarding a missed dose of Fungin?

Official guidance describes the approach for a missed dose as applying it as soon as possible unless it is almost time for the next dose.

It is explicitly noted in patient information that a double dose should not be used to compensate for a missed dose.


Q: What is the typical monitoring process to determine if Fungin is working as intended?

Official documentation suggests regular progress checks with a healthcare professional during and after treatment.

It is noted that professional consultation is suggested if symptoms do not begin to improve or if they worsen.


Q: Is it necessary to complete the full course of Fungin even if symptoms clear up early?

Regulatory documents emphasize that the full duration of treatment is described as necessary, even if symptoms begin to clear up quickly.

Official warnings state that stopping the medicine too soon can lead to the infection returning.


Q: Are there any special considerations or warnings for elderly patients using Fungin?

Official regulatory summaries note that there is no specific information comparing the use of topical or lozenge forms in the elderly with other age groups.

However, the medicine is not expected to cause different side effects or problems in older adults than in younger adults.


Q: Is Fungin ever officially prescribed for the prevention of fungal infections?

The oral lozenge form of Clotrimazole is officially indicated for both the treatment and the prevention of thrush (oropharyngeal candidiasis) in certain populations.


Q: Is it normal to have a dry mouth or a metallic taste while on this medicine?

Official sources for the lozenge formulation list a bad or unusual taste in the mouth as a less serious side effect that has been reported.

The reporting of this effect to a healthcare professional is suggested in patient information.


How should Fungin be stored and disposed of?

How to Store and Dispose of Fungin (Clotrimazole)

The storage and disposal instructions for Fungin (Clotrimazole) are defined by official labeling to ensure product stability and safety.

Storage Requirements

The medication must be stored at controlled room temperature, typically between 20 C and 25 C. It is mandatory to avoid freezing the product, which can compromise its formulation. The product container must be kept tightly closed to protect it from moisture, and it must remain in its original packaging. A key regulatory mandate is to keep out of the sight and reach of children.

Disposal

Unused or expired Fungin must be disposed of in accordance with local regulations and should not be flushed down the toilet or poured into a drain. Patients should follow drug take-back programs or consult a pharmacist for guidance on safe disposal.

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

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