Clozol

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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 Clozol

Quick Facts

Property Description
Active ingredient Clotrimazole
Form Cream, Solution, Lotion, Vaginal Tablet
Pharmacological class Antifungal Agent, Azole Derivative
Common use Combating fungal and yeast proliferation (Antimycotic)
Origin Synthetic

What is Clozol? Defining the Active Ingredient and Class

Clozol is a pharmaceutical preparation that utilizes Clotrimazole as its sole active ingredient. The substance is structurally defined as an imidazole derivative, positioning it within the larger azole antifungal class of medicines, which are synthetic in origin. Clotrimazole is categorized as a local antifungal agent, used for treating localized mycoses. A key feature of Clozol is its availability across a variety of topical preparation types, making it suitable for application to different affected areas of the body.

Composition and Form: A Single-Ingredient Topical Preparation

Clozol is supplied primarily as a single-ingredient product intended for topical administration, which involves localized application to the affected skin or mucous membranes. This contrasts with combination treatments, focusing its therapeutic effort exclusively on the action of Clotrimazole. Common dosage forms include cream, topical solution, lotion, and vaginal tablet formulations, all designed to ensure effective contact with the infection site. The Clotrimazole is integrated into an appropriate base or vehicle suitable for its intended route, such as an emulsified cream or a hydroalcoholic solution, depending on the product’s formulation specifications.

General Purpose: Combating Fungal Proliferation

The general purpose of Clozol is to inhibit the growth and eliminate fungal organisms responsible for superficial infections. The drug's physiological action exerts a fungistatic (growth-halting) and fungicidal (killing) effect. By inhibiting the synthesis of ergosterol, Clotrimazole disrupts the structural integrity of the fungal cell wall. This mechanism compromises the physical structure of the fungal organism in scenarios involving localized fungal overgrowth, helping to resolve the microbial imbalance and restore the body’s normal environment.

Regulatory References

  1. WHO Essential Medicines List for Clotrimazole
  2. Clotrimazole Topical Pharmacology (NCBI/NIH)
  3. Mechanism of Action for Azole Antifungals (NIH/NCBI)

What side effects are possible with Clozol?

Possible side effects and safety information

The safety profile of Clozol (Clotrimazole), as documented in government regulatory sources, is primarily defined by local reactions at the application site. The officially listed adverse reactions are classified across three main System-Organ Classes: Skin and subcutaneous tissue disorders, General disorders and administration site conditions, and Immune system disorders.


Documented Adverse Reactions

The most frequently reported effects are classified as Common and involve localized symptoms. These include a burning sensation, stinging, localized pruritus (itching), and erythema (redness) . Other local effects documented include edema (swelling), discomfort, and skin exfoliation (peeling).

Classification Examples of Reactions
Common Local Burning, Pruritus, Stinging, Erythema
Other Local Blistering, Peeling, Edema

Serious Safety Considerations

The most significant, though rare, safety concern documented in regulatory texts is the potential for Systemic Hypersensitivity Reactions (allergic reactions). These may include symptoms such as hives (urticaria) or breathing difficulties (dyspnea). The frequency of these systemic events is often classified as Not Known, meaning it cannot be estimated from available data, but their presence is formally recognized.


Specific Safety Constraints

A specific, non-pharmacological restriction applies to certain vaginal formulations. The excipients in these products may cause damage to latex contraceptive devices, such as condoms or diaphragms, potentially impairing their reliability. Regulatory documents advise that users rely on alternative precautions during and shortly after treatment. Furthermore, use during pregnancy and lactation should be under the direction of a healthcare professional, especially during the first trimester. Local reactions are generally transient and may be more pronounced during the initial phase of treatment.

Overdose and Emergency Response

Overdose and when to seek help

Overdose scope

Feature Regulatory Documentation Status
Documented Overdose Presentation Primary concern is accidental oral ingestion of the topical formulation.
Physiological Systems Affected Primarily the gastrointestinal system, manifesting as nausea, vomiting, and abdominal discomfort.
Systemic Risk Systemic toxicity is not expected following overdose or accidental ingestion due to the minimal absorption rate of the active ingredient.
Population-Specific Notes Official overdose sections do not include distinct warnings for specific populations regarding altered severity.

Official Emergency Response

Required Action Label-Derived Phrasing Only
Immediate Action Mandated Seek immediate medical attention upon known or suspected overdose.
Antidote Information No specific antidote is known for this active ingredient.
Management Measures Management must be symptomatic and supportive. Gastric decontamination may be considered by medical professionals when a large quantity of the formulation has been ingested.

Connection to the Overall Overdose Profile

Regulatory documents define the overdose profile by stating that systemic toxicity is not expected due to the minimal absorption of the topical agent, which constrains the potential for severe outcomes. Official guidance requires the user to seek immediate medical attention and contact a Poison Control Center if accidental oral ingestion occurs, reflecting the need for clinical observation and symptomatic management of documented gastrointestinal manifestations. This management approach is focused entirely on supportive care, confirming the absence of a known specific antidote.

Therapeutic Uses of Clozol

What Clozol Treats: Main Uses and Benefits

Clotrimazole is commonly used to treat conditions involving superficial fungal infections of the skin, which may be part of symptomatic management.

Clozol is relevant in conditions characterized by periods of heightened symptoms related to both dermatophytoses and localized candidiasis. It is generally applied in addressing common skin and mucosal issues such as Tinea pedis (athlete's foot), Tinea cruris (jock itch), Tinea corporis (ringworm), and vulvovaginal yeast infections. The medication is used for managing symptom clusters that may become intense, such as pronounced pruritus (itching), burning sensations, and local erythema (redness).

“Clozol provides supportive relief when symptoms interfere with routine activities.”

The medication plays a role in managing symptoms related to inflammatory or irritative states. Applied in scenarios where additional management of discomfort is required, Clozol is relevant for easing the overall symptom load during these symptomatic periods. It is applied in addressing symptoms related to physical skin changes like flaking and cracking associated with the irritative state.

Quick Fact: Relief for Pruritus
Primary Symptom Relief Easing of intense itching and localized burning.
Condition Type Superficial fungal and yeast infections.
Core Therapeutic Benefit Supports the patient during difficult episodes by easing distress.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

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

Eligibility Scope

Classification Official Regulatory Statements
Populations for whom use is allowed Adults and older adults are generally eligible. Use in the second and third trimesters of pregnancy is permitted under supervision.
Populations for whom use is not recommended Children under two years of age (OTC topical) and those under 12 years (vaginal forms) are not recommended without medical authorization. Use is not advised during menstruation.
Populations for whom use is contraindicated Patients with known hypersensitivity to clotrimazole, other imidazole antifungals, or any excipients in the formulation.
Age-related eligibility rules Minimum age threshold for OTC topical use is two years. Safety and effectiveness are generally established for older adults.
Condition-specific eligibility rules The product is not effective for fungal nail infections (onychomycosis) and is not for ophthalmic use.

Eligibility Classifications (High-Level)

Classification Regulatory Definition
Eligibility severity classification Contraindicated (Hypersensitivity); Restricted Use (First Trimester of Pregnancy); Not Established (Certain Pediatric Use).
Pregnancy and lactation eligibility status Restricted in the first trimester. Caution is advised during lactation; avoid application to the breast area.

Resulting Eligibility Structure

Official eligibility statements:

  • The primary prohibition is documented hypersensitivity to the active ingredient.
  • Eligibility is formally restricted for infants and for use during the first trimester of pregnancy.
  • A conditional use constraint is imposed due to the potential for vaginal forms to damage latex contraceptive devices.

Connection to the Overall Eligibility Profile

Official regulatory documents define the eligible population primarily through strict contraindications and documented restrictions based on age and physiological status. These governmental classifications establish clear boundaries for use, conditioning treatment during pregnancy and restricting application to specific body sites like the eye or nail.

What should I know about interactions with other medicines?

Clozol Interactions with other medicines and products

Official regulatory documents define the interaction profile for Clozol, primarily in its vaginal formulation, across two distinct domains: systemic exposure modification and physical device integrity.

Category Official Regulatory Classification/Basis
Interaction severity classification Interactions requiring close patient/plasma level monitoring; Interactions causing reduction of contraceptive effectiveness.
Interaction-context constraints Applies to vaginal formulation due to potential for localized absorption affecting systemic drugs or local physical damage to devices.

Official interaction statements:

  • Co-administration of the vaginal formulation of Clozol with the oral immunosuppressants Tacrolimus or Sirolimus is a documented pharmacokinetic interaction [SmPC]. This may lead to increased plasma levels of the immunosuppressant, which requires appropriate monitoring for signs of overdosage.
  • Vaginal Clozol is officially documented to potentially cause damage to latex contraceptives, including condoms and diaphragms [SmPC]. This physical damage can reduce the effectiveness of the contraceptive device in preventing pregnancy or sexually transmitted disease.
  • A mandatory timing-based restriction applies, requiring users of latex contraceptives to employ alternative precautions for at least five days following the use of the vaginal preparation.
  • Regulatory data reports no antagonism or synergism when Clotrimazole is tested against Candida albicans strains in combination with the polyene antifungal agents Amphotericin B or Nystatin [NIH/NCBI].

The official interaction structure is limited to these specific systemic drug and local device interactions due to the minimal systemic absorption of the topical and vaginal formulations.

Mechanism of Action

Clozol's action is fundamentally based on disrupting the unique life processes of fungal organisms, resulting in the loss of cellular function and integrity. The mechanism involves two primary mechanistic domains: targeted enzyme inhibition and consequential compromise of cellular structure.

The mechanism initiates at the molecular level by binding to and inhibiting the fungal enzyme Lanosterol 14-alpha-demethylase (CYP51). This enzyme is essential for manufacturing ergosterol, the primary structural sterol of the fungal cell membrane. By preventing this synthesis, the drug initiates a structural and metabolic defect that is highly selective, as this pathway is absent in human host cells.

The lack of ergosterol production directly compromises the integrity and permeability of the fungal cell membrane. This structural failure is amplified by the accumulation of toxic precursor molecules, known as 14-alpha-methylated sterols, which contribute to membrane instability. This cascade results in the uncontrolled leakage of vital cellular contents and the shutdown of critical membrane-bound enzymes, resulting in growth inhibition or fungicidal action.

Dosage and Administration Information

The administration of Clozol (Clotrimazole) is defined by standardized protocols that utilize either a topical (cream, solution) or intravaginal (cream, tablet) route, depending on the site of the fungal infection.

Topical Administration

For superficial infections of the skin, Clozol is typically applied twice daily, once in the morning and once in the evening. The application amount should be sufficient to form a thin layer that covers the affected skin area and the surrounding borders. The standard protocol involves washing and drying the skin thoroughly before each application. The duration of the topical regimen is specified by product guidelines and is intended to be followed for a full course, which typically ranges from two to four weeks for most body and yeast infections, extending up to eight weeks for conditions such as Tinea pedis. The product is not intended for use on the nails or the scalp.

Intravaginal Administration

For intravaginal use, the medication is supplied in fixed-dose unit strengths, such as 100 mg, 200 mg, or 500 mg tablets, or 1% and 2% cream formulations. This form is inserted once daily, preferably at bedtime. Treatment follows specified course durations of either one, three, or seven days, determined by the milligram strength used. If an application is missed, instructions generally suggest applying the dose when remembered unless it is near the time for the next scheduled dose, in which case the missed dose is skipped to prevent doubling the application amount. In pediatric populations, similar dosing protocols are generally utilized for children over 2 or 3 years of age for topical use, as per specific product labeling.

Recent Clinical Evidence

Clozol: Recent Clinical Evidence

This overview summarizes the clinical research that has evaluated Clozol (Clotrimazole), focusing on the types of studies conducted and where evidence limitations exist. This information describes group patterns observed in studies and is not a substitute for medical guidance.


Evidence for Skin and Tinea Infections

The research base for Clotrimazole’s evaluation against common fungal infections, such as athlete's foot and ringworm, relies on short-term Randomized Controlled Trials (RCTs). Researchers examined two outcomes: lab confirmation that the fungus is no longer detected (mycological cure) and the monitoring of patient-reported discomfort (clinical cure). Findings describe patterns where clearance measurements were reported, often comparable to those seen with other antifungal agents tested in short-term comparative studies. Evidence quality varies across studies, and there is limited information for long-term outcomes to track the durability of the effect and recurrence.

Evidence for Vulvovaginal Candidiasis (Yeast Infections)

Clotrimazole was studied for use in uncomplicated yeast infections using controlled clinical trials focused on short-term symptom changes in adult women. Studies examined single vs. multi-day regimens, reporting that clearance and symptom monitoring patterns were generally consistent regardless of the duration studied. Research has also monitored severe or recurrent cases, where prolonged maintenance regimens were explored to achieve sustained remission. In specific observational studies involving symptomatic pregnant women, treatment of the genital infection was observed to be associated with a recorded reduction in the incidence of preterm birth measurements. Data for infections caused by non-albicans species remain insufficient.

What is Still Uncertain in the Evidence Base

Most clinical research examined short-term changes, and long-term effects are not fully established for the prevention of recurrence in most uses. Comparative evidence is lacking for direct, modern head-to-head comparisons against all other topical antifungals, meaning certainty remains low when trying to definitively determine if any single topical antifungal provides better measurements than all others for short-term cure rates. Studies help show what has been observed so far, but results apply only to the populations studied.

Key Studies & References

  1. Clotrimazole for Vulvovaginal Candidosis: More Than 45 Years of Clinical Experience (Systematic Review/Meta-analysis)

Frequently Asked Questions (FAQ)

Common questions about Clozol (FAQ)

Q: How quickly does Clozol usually start working for people?

A: Official product information, often based on clinical trials, indicates that symptom improvement typically begins within the first week of starting topical treatment. This includes relief from discomforts like itching (pruritus). However, it is important to continue using the medication for the full prescribed course, even if symptoms improve quickly.

Q: How long can a person usually stay on Clozol?

A: Regulatory documents state that treatment is generally intended to be limited to the required short-term course duration specified in the official instructions. The safety and effectiveness of using systemic forms of the drug for a prolonged duration have not been fully established. Official guidance emphasizes the importance of adhering to the recommended course length.

Q: Is it true that Clozol can interact with certain common foods?

A: Official information regarding the topical formulation of Clozol indicates that there are generally no known interactions with common foods or drinks. Information regarding specific drug-drug interactions can be found in the dedicated Clozol Interactions section.

Q: Can herbal supplements interfere with how Clozol works?

A: While specific herbal products are not always listed in mandatory interaction warnings, official patient information advises users to inform their healthcare provider about all medicines, vitamins, and supplements. This is generally done so that healthcare providers have a complete picture when reviewing potential interactions or interference.

Q: What should I know about Clozol and alcohol consumption?

A: Regulatory guidance and official patient information indicate that there is generally no known interaction between clotrimazole and the consumption of alcohol. For any concerns about combining this medication with alcohol, official information supports consulting a healthcare provider.

Q: Can I take Clozol if I have a history of liver problems?

A: For systemic forms of clotrimazole (such as oral lozenges, which are absorbed internally), periodic assessment of liver function tests may be recommended by a healthcare professional for patients who have pre-existing liver impairment. This monitoring is used to observe how the body processes the medicine.

Q: What happens if I miss a dose of Clozol (in general terms)?

A: If a topical or intravaginal dose is missed, official patient instructions advise that you should apply the dose as soon as you remember. However, if it is already close to the time of the next scheduled dose, the missed dose should be skipped entirely to prevent applying a double amount. Following the treatment schedule as prescribed is a common component of achieving optimal therapeutic outcomes.

Q: Is Clozol used for anything besides the main condition?

A: Official regulatory documents and scientific information indicate that the active ingredient, Clotrimazole, has action against certain types of bacteria in addition to its primary antimycotic (antifungal) effect. Specifically, it has been documented to exhibit activity against some gram-positive and gram-negative micro-organisms.

Q: Is it common to feel tired when taking Clozol?

A: Fatigue or tiredness is not listed in official documentation as a common side effect of the topical drug. The most frequently reported effects are localized at the application site, such as burning or itching. Unusual or extreme tiredness may be a rare symptom associated with a serious adverse event, particularly when using combination products.

Q: Can Clozol cause problems with my stomach?

A: The common side effects reported in official documents primarily involve local reactions at the application site (e.g., burning, redness). Symptoms like nausea or vomiting are not common but have been reported in connection with rare systemic reactions or when using oral formulations of the drug.

Q: Can older adults typically use Clozol safely?

A: Yes, official labeling indicates that the safety and effectiveness of the medication are generally established for the treatment of localized fungal infections in adults, which includes the older adult population.

Q: How does Clozol affect my ability to drive or operate machinery?

A: Official regulatory documents, such as the Summary of Product Characteristics (SmPC) in Europe, indicate that the medication has no or negligible influence on the ability to drive or use machinery.

Q: Is Clozol considered a controlled substance?

A: No. Official government classification lists for controlled substances confirm that Clotrimazole (the active ingredient in Clozol) is Not a controlled drug under the Controlled Substances Act (CSA) Schedule.

Q: If I feel better, can I stop taking Clozol on my own?

A: Official patient information consistently advises users to use the medication for the full treatment time prescribed by the healthcare professional or indicated on the packaging. Stopping the full treatment course early, even upon improvement, has been associated with the infection possibly returning.

Q: Is 'weight gain' a common concern for people using Clozol?

A: Weight gain is not listed in official documentation as a common side effect of clotrimazole alone. It has been reported as a rare symptom potentially associated with adrenal issues when using certain combination products that also contain a corticosteroid.

Q: What kind of studies led to Clozol being approved by the FDA or EMA?

A: Approval was based on controlled clinical trials and Randomized Controlled Trials (RCTs). these studies measured both the patient's reported clinical improvement and confirmed the physical elimination of the fungal organism.

Q: How is Clozol described in patient information leaflets from official sources?

A: Official patient information leaflets describe Clozol primarily as an antifungal agent. Key descriptions include its common uses and safety warnings, such as the directive that it is generally 'for external use only' and that contact with the eyes should be avoided.

Q: How does the research evidence say about Clozol's long-term use?

A: Most clinical research has focused on short-term outcomes, such as immediate cure rates. Evidence regarding the safety and benefits of extended or long-term use, especially for preventing future recurrence, is generally limited.

Q: Is the long-term benefit of Clozol supported by many studies?

A: Clinical studies primarily focus on short-term cure rates for fungal infections. Since most studies focus on short-term cure rates, evidence supporting definitive long-term benefit or prevention of recurrence when compared to all other similar drugs is limited.

Q: What are the main risks for younger adults using Clozol?

A: Official documentation indicates that the primary risks for younger adults are generally the same as those documented for all adult populations, such as local irritation and hypersensitivity reactions. Regulatory restrictions primarily focus on minimum age thresholds, such as for use in children under two years old.

How should Clozol be stored and disposed of?

Storage and Disposal Requirements

Clozol (Clotrimazole) must be stored and handled according to official regulatory labeling to maintain its stability and ensure household safety.


Storage Conditions

Requirement Details
Temperature Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F).
Protection Avoid freezing and store away from excess heat and moisture. Do not store in the bathroom.
Container Rule Keep the medication in the original container and ensure the cap is tightly closed.

Safety and Disposal

The medicine must be kept out of the sight and reach of children at all times.

For disposal, do not flush unused or expired Clozol down the toilet or sink. The preferred method is to utilize an official drug take-back program. If a take-back option is unavailable, the product may be mixed with an undesirable substance (such as dirt) and placed in a sealed container before discarding in the household trash.

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

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