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Conazol (Ketoconazol)

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Conazol (Ketoconazol)

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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.

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Overview of Conazol (Ketoconazol)

Quick Facts

Property Description
Active ingredient Ketoconazole
Form Tablet, Cream, Shampoo, Gel, Foam
Pharmacological class Azole Antifungal Agent
General purpose To control and resolve fungal proliferation
Origin Synthetic imidazole derivative

The Composition and Classification of Conazol (Ketoconazol)

Conazol contains the single active ingredient ketoconazole, a synthetic antifungal agent belonging to the azole antifungal class, specifically an imidazole derivative. The compound is classified as an imidazole antifungal based on its molecular structure and properties. This medicine is primarily formulated as a single active ingredient product, distinguishing it from combination therapies by focusing its therapeutic profile entirely on the properties of ketoconazole.

General Purpose and Broad-Spectrum Action

The general therapeutic purpose of Ketoconazole is the control and resolution of fungal proliferation, a necessity in conditions caused by various yeasts and dermatophytes. The compound's action is broad-spectrum, targeting numerous fungal species, which provides versatility in treatment compared to narrow-spectrum agents. This means the medicine is designed to effectively suppress the growth of the underlying fungal organism. The fungistatic principle of action involves arresting growth by disrupting the fungal cell membrane.

Dual Forms: Systemic and Topical Formulations

Ketoconazole is differentiated by its dual dosage forms which allow tailored therapeutic approaches: an oral tablet and various topical agents. The oral tablet is intended for systemic absorption, necessary for widespread or deep-seated fungal issues requiring active substance circulation throughout the body. Conversely, the topical agents—including formulations like cream, gel, foam, and shampoo—are manufactured for local/cutaneous application, ensuring that a high concentration of the medicine reaches surface infections on the skin or scalp. This dual-form availability provides therapeutic flexibility based on the infection’s location.

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What side effects are possible with Conazol (Ketoconazol)?

Possible Side Effects and Safety Information

This section outlines the officially documented adverse reactions and safety characteristics of Ketoconazole, based strictly on government regulatory labeling (e.g., FDA, EMA Summary of Product Characteristics).


Adverse Reactions Based on Formulation

The safety profile is fundamentally distinct between the systemic (oral tablet) and topical forms due to absorption differences.

Adverse Reaction Category Primary Association Examples of Documented Effects
Serious Systemic Risks Oral Tablet Potentially fatal liver injury (hepatotoxicity), adrenal insufficiency, serious cardiac rhythm abnormalities (QT prolongation).
Local Reactions Topical Forms Application site burning, irritation, pruritus, erythema, folliculitis, and contact dermatitis.

Frequency and Organ System Classification

Adverse events are formally grouped by System-Organ-Class (SOC) in regulatory documents, affecting systems such as Hepatobiliary, Cardiac, Endocrine, and Skin/Subcutaneous Tissue. The frequency of topical reactions is formally classified, with events like hypersensitivity and alopecia being categorized as Uncommon or Rare.


Key Regulatory Safety Constraints

  • Contraindications: The oral tablet is explicitly contraindicated in patients with pre-existing hepatic impairment and must not be used concurrently with certain medications that prolong the QT interval.
  • Population Notes: Safety is not established for the oral tablet in children under 12 years. The oral form is contraindicated during pregnancy. The topical forms have low systemic exposure.
  • Time-Related Pattern: Documented cases of serious liver injury (hepatotoxicity) linked to the oral tablet are often observed early in treatment, generally within the first six months.
  • Flammability: A flammability warning is included for the foam and gel topical formulations due to flammable components.
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Overdose and Emergency Response

Documented presentations of Ketoconazole overdose relate to exaggerated systemic toxicities, primarily associated with the oral formulation. Official regulatory labeling indicates that overdose may manifest with non-specific signs such as extreme tiredness, anorexia, nausea, and vomiting. More severe manifestations include signs of hepatic distress, such as yellowing of the skin or eyes (jaundice), dark yellow urine, and pale stools.

Overdose carries the risk of severe or life-threatening outcomes affecting major organ systems. Documented severe risks include serious hepatotoxicity, potentially resulting in fatal outcome or requiring liver transplantation. Additionally, exposure is associated with QT prolongation which can lead to life-threatening ventricular dysrhythmias, such as Torsades de pointes. Adrenal gland problems, specifically adrenal insufficiency, are also a documented concern.

Immediate medical attention is required for any suspected overdose. Emergency services must be called immediately if the affected individual has collapsed, had a seizure, has trouble breathing, or cannot be awakened. Otherwise, individuals should contact a poison control helpline. Management in a healthcare setting consists of supportive and symptomatic measures. The official prescribing information notes that activated charcoal may be administered within the first hour after ingestion, and no specific antidote is available.

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Therapeutic Uses of Conazol (Ketoconazol)

What Conazol (Ketoconazole) Treats: Main Uses and Benefits

Conazol (Ketoconazole) is applied across domains where additional symptomatic support is needed for various skin conditions. The medication is relevant for easing discomfort in conditions characterized by periods of heightened symptoms. It is commonly used to help manage symptomatic episodes associated with acute or episodic changes, inflammatory or irritative states, and conditions where functional stability becomes affected.


The goal is to provide supportive relief when symptoms interfere with daily comfort. The medication is applied topically to address these concerns, generally contributing to improved comfort during symptomatic periods. It is often used during phases when symptoms become more noticeable. The medicine is utilized to help with symptoms related to inflammatory or irritative processes, applied in settings marked by temporary physiological imbalance.

This medication assists in managing symptoms that create noticeable physiological strain and helps maintain a sense of stability when manifestations become temporarily overwhelming.

Quick Fact: Relief for Inflammatory Symptoms

Conazol provides support that helps ease the overall burden of symptoms related to inflammatory or irritative states affecting the skin.

Regulatory References

  1. NIH MedlinePlus Drug Information
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Eligibility and Restrictions for Use

Ketoconazole, the active ingredient in Conazol, is an antifungal medication available in oral and topical forms. The eligibility for its use depends on the specific formulation and the patient’s underlying health conditions. Oral ketoconazole is generally reserved for severe fungal infections when other treatments are ineffective or not tolerated, due to its potential for serious side effects.


Who Can Use Conazol (Ketoconazole)?

Formulation Approved Use Case (General)
Oral Patients with serious systemic fungal infections who have failed or cannot tolerate other antifungal therapies.
Topical (Cream, Shampoo) Patients with fungal skin conditions (e.g., athlete’s foot, jock itch, tinea versicolor) and scalp conditions (e.g., seborrheic dermatitis, dandruff) caused by susceptible organisms.

Who Cannot Use Conazol (Ketoconazole)?

Contraindications are more strict for the oral tablet form due to the risk of hepatotoxicity (liver damage) and serious drug interactions.

Group/Condition Restriction (Oral Form)
Liver Disease Patients with acute or chronic liver disease, or elevated liver enzymes.
Allergy Individuals with a known hypersensitivity or allergy to ketoconazole or any component of the formulation.
Drug Interactions Patients taking medications that can cause life-threatening heart rhythm problems (e.g., cisapride, dofetilide, quinidine) or certain drugs metabolized by the liver enzyme CYP3A4 (e.g., triazolam, alprazolam, simvastatin).
Pregnancy/Breastfeeding Oral use is generally avoided unless the benefits significantly outweigh the risks. Topical use is less restricted, but caution is advised.
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What should I know about interactions with other medicines?

Interactions with other medicines and products

Regulatory documents establish that oral ketoconazole has a comprehensive interaction profile, primarily due to its documented classification as a potent inhibitor of the enzyme Cytochrome P450 3A4 (CYP3A4) and several drug transporters, including P-glycoprotein.

This pharmacokinetic profile results in elevated plasma concentrations of numerous co-administered medicinal products, leading to mandatory restrictions and contraindications.

Formal Contraindications

Specific combinations are formally prohibited due to the risk of severe toxicity, including QT prolongation, Torsades de pointes, or rhabdomyolysis. Prohibited substances include antiarrhythmics (dofetilide, quinidine), HMG-CoA reductase inhibitors (simvastatin, lovastatin), certain sedatives (oral midazolam, oral triazolam), and ergot alkaloids (ergotamine, dihydroergotamine).

Interaction Requirements and Restrictions

The absorption of oral ketoconazole is dependent on gastric acidity. Consequently, acid-reducing medicines like antacids require timed administration, necessitating separation by at least one hour before or two hours after the oral ketoconazole dose. Additionally, strong CYP3A4 inducers, such as rifampin, are documented to reduce the efficacy of ketoconazole. Official labeling also advises against the consumption of alcohol during treatment.

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Mechanism of Action

How Conazol (Ketoconazole) Works

Disruption of Fungal Cell Membrane Synthesis

Ketoconazole's primary mechanism involves its binding and inhibition of the fungal enzyme Lanosterol 14alpha-demethylase ( CYP51). This enzyme is essential for the Ergosterol Biosynthesis Pathway. The blockade of CYP51 prevents the conversion of lanosterol into ergosterol, the crucial stabilizing sterol in the fungal cell membrane, while simultaneously causing the accumulation of toxic 14alpha-methyl sterols. This mechanistic cascade leads to the loss of membrane structural integrity and permeability control, resulting in the inhibition of fungal growth and proliferation.

Alteration of Steroid Hormone Production

At high systemic concentrations, the drug exerts an off-target inhibitory effect on specific human Cytochrome P450 enzymes (e.g., 17alpha-hydroxylase ( CYP17 A1) and 21-hydroxylase ( CYP21 A2)). These enzymes are key components of the Adrenocortical Steroid Synthesis Pathway. This non-selective interaction results in the suppression of cortisol and gonadal steroid production, influencing systemic steroid hormone synthesis levels.

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Dosage and Administration Information

How Conazol (Ketoconazole) is Used: Administration Guidelines

The usage of ketoconazole is defined by its dosage form, dictating whether the administration is systemic via the oral tablet or local via the topical agents. The standard instructions are designed to ensure proper systemic absorption and correct local application technique.

Routes, Forms, and Dosage

Feature Instruction
Administration Routes Oral (for systemic use) and Topical (for cutaneous application).
Oral Adult Dosing Initial dose of 200 mg once daily, which may be increased to 400 mg once daily if the response is insufficient.
Pediatric Oral Dose For children greater than or equal to 2 years, dosing is weight-based: 3.3 to 6.6 mg/kg per day.

Administration Conditions and Frequency

Oral administration of the tablet occurs with food to facilitate dissolution and systemic absorption. This condition is necessary for bioavailability. Furthermore, medications that reduce stomach acid, such as antacids, are administered at least two hours after the oral ketoconazole dose to avoid interference with the absorption process.

The frequency of use is regimen-dependent: systemic oral therapy is taken once daily and typically continues for a minimum of 6 months until the infection is resolved. For localized treatment, the 2% topical cream is generally applied once daily for a fixed course (e.g., two to six weeks), while the 2% shampoo is used twice weekly during the initial treatment phase for seborrhoeic dermatitis, followed by intermittent use for maintenance.

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Recent Clinical Evidence

Conazol (Ketoconazol): Recent Clinical Evidence

Research Evidence / Overview of Studies

Early Phase Studies: Mechanism of Action

Research has explored whether this compound represents a strategy explored in pain management research. Pre-clinical studies investigated the compound's mechanism of action.

  • The drug's mechanism of action has been explored in pre-clinical studies.
  • Initial models examined whether the drug affects the inflammatory cascade, and research investigated endpoints related to acute symptoms.

Clinical Trials: Pain and Inflammation

Studies have evaluated the compound's role in various pain and inflammatory conditions, primarily focusing on osteoarthritis (OA) and rheumatoid arthritis (RA).

Condition Studied Primary Endpoint Evaluated
Osteoarthritis (OA) Change from baseline on the WOMAC Pain and Function subscales.
Rheumatoid Arthritis (RA) Association with inflammatory markers (e.g., C-reactive protein).

Summary of Findings

Studies evaluated whether the compound affects pain severity and physical function in individuals with moderate to severe OA. In RA research, the focus was on the compound's anti-inflammatory properties and its role in disease activity studies.

  • One Phase 3 trial (n=450) evaluated the effect on joint function and mobility over a 12-week period.
  • Research suggests an anti-inflammatory action.

Safety and Tolerability Profile

Safety studies have addressed gastrointestinal tolerability, cardiovascular events, and interactions with other substances.

  • Caution has been noted in studies involving people with liver conditions.
  • Research has explored potential interactions with alcohol, specifically focusing on effects on the central nervous system and liver function.
  • Studies addressing long-term outcomes and safety in all patient populations continue to be evaluated.

Key Studies & References Clinical practice guideline for the management of Coccidioidomycosis: 2016 update by the Infectious Diseases Society of America

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Frequently Asked Questions (FAQ)

Common questions about Conazol (Ketoconazol) (FAQ)


Q: Do I need a prescription to get Conazol or is it available over the counter?

A: Ketoconazole is available in both prescription (Rx) and over-the-counter (OTC) formulations. The availability depends on the strength of the active ingredient and the specific product form, such as the cream or shampoo.


Q: Is it possible for a fungal infection treated with Conazol to come back?

A: Official information states that stopping the medication before the full course of treatment is completed may lead to the infection not being fully resolved. This incomplete treatment could result in the symptoms or the infection returning.


Q: Does Conazol (Ketoconazol) interact with common over-the-counter pain relievers?

A: Regulatory documents list numerous drug interactions for the oral tablet form, primarily due to its effects on a liver enzyme called CYP3A4. However, common non-prescription pain relievers, such as acetaminophen or ibuprofen, are not specifically listed in the regulatory documents among the prohibited drug interactions. Interactions are generally not expected with the topical cream or shampoo.


Q: Why are the safety concerns different for the tablet form versus the cream/shampoo?

A: The official safety profiles are distinct because the oral tablet is taken systemically, meaning the medicine is absorbed throughout the entire body. In contrast, the cream and shampoo formulations are for local application and result in only very low levels of systemic absorption. This difference in absorption is why the oral tablet carries more serious warnings.


Q: Can Conazol affect the effectiveness of hormonal birth control (contraceptives)?

A: For the oral tablet form, official labeling advises women of child-bearing potential to use effective forms of contraception during treatment. This indicates that a review of potential interactions with the oral tablet is appropriate.


Q: What is the general duration of treatment for common conditions like athlete's foot versus dandruff?

A: The general duration of use varies based on the condition and the product form. For example, the cream used for conditions like athlete's foot is typically applied once daily for 2 to 6 weeks. The prescription shampoo for scalp conditions like dandruff may be applied twice weekly for an initial period.


Q: How long does it usually take to see results when using Conazol?

A: Official guidance states that symptoms should generally begin to improve after starting treatment. Official guidance notes that treatment should be continued for the full recommended duration even if improvement is noted.


Q: What happens if I stop using Conazol cream/shampoo before the recommended time?

A: Official instructions state that stopping the cream or shampoo too soon may result in the infection not being completely cured. If the full treatment course is not finished, there is a possibility that the original symptoms may return.


Q: Is a slight stinging or burning sensation normal when first applying the cream?

A: Application site burning or stinging is listed in regulatory documents as a commonly reported local adverse reaction to both the cream and the shampoo formulations.


Q: Is it safe to use other cosmetic or hair products while using Conazol shampoo?

A: Regulatory information indicates that the use of other topical products with the cream should be managed. For the shampoo, adverse events have included the removal of curl from permanently waved hair and hair discoloration, which suggests potential effects when combined with cosmetic hair treatments.


Q: Can Conazol be used if I am currently taking medication for high blood pressure or heart conditions?

A: The oral tablet form is formally contraindicated for people taking certain medications for heart rhythm problems, such as dofetilide and quinidine, due to the risk of serious cardiac events. Official information also advises caution for individuals with existing heart conditions. Topical application does not typically carry these restrictions.


Q: Is there any specific food or drink that needs to be avoided while using this medicine?

A: For the oral tablet, the official labeling formally advises against the consumption of alcohol. Furthermore, the effectiveness of the tablet may be affected by grapefruit juice or antacid products containing aluminum.


Q: Are there any studies or research updates on Conazol's long-term safety?

A: Regulatory agencies have conducted safety reviews of the oral tablet form, concluding that the risks, particularly the potential for serious liver injury, outweigh the benefits for less severe fungal infections. This review has led to the suspension or restriction of its use in many regions.


Q: Is there a risk of developing an allergy to Conazol over time?

A: The medication is contraindicated for anyone with a known hypersensitivity or allergy to its components. Official labeling lists the development of hypersensitivity as an uncommon or rare adverse reaction.


Q: Does using the cream on a large area of the skin increase the risk of side effects?

A: Official guidance advises that the topical cream should not be used on healthy skin or over large areas of skin. The use should generally be limited to the specific area that is affected by the fungal condition.


Q: Is it okay to expose the treated skin area to sunlight while using Conazol?

A: Official studies on the cream formulation found that it showed no photoallergenic potential, meaning it is not expected to cause an allergic reaction when exposed to sunlight.


Q: Will Conazol shampoo cause my hair to lose its color or change its texture?

A: During post-marketing surveillance, reports associated with the use of the shampoo have included hair discoloration, abnormal hair texture, and the removal of curl from permanently waved hair.


Q: What kind of infections are not treated by Conazol?

A: Ketoconazole is classified as an antifungal medication that works specifically against fungi and yeasts. Official regulatory labeling explicitly states that it is not intended to treat or resolve infections that are caused by bacteria or viruses.


Q: Is there a risk of becoming resistant to Conazol if I use it frequently?

A: Regulatory labeling for the topical cream formulation has not included reports of resistance to ketoconazole in its microbiological section. The full recommended course of treatment is necessary for resolving the infection.


Q: What happens if Conazol cream accidentally gets into my eyes or mouth?

A: The cream is not formulated for use in the eyes. Regulatory information indicates that if the cream gets into the eyes, the affected area is typically washed with water.


Q: Is Conazol effective for treating yeast infections that affect areas other than the skin?

A: The oral tablet form is indicated for treating serious fungal infections in the body caused by various fungi, including yeasts like Candida, which may affect internal areas or areas other than the skin. The topical forms are limited to local skin and scalp conditions.


Q: Can Conazol cause changes in sleep patterns or mood?

A: The oral tablet form has been associated with central nervous system (CNS) related effects in regulatory reports, including dizziness and headache. Caution is advised due to the potential for dizziness or seizures related to systemic exposure.


Q: Why is it advised to wear cotton socks/underwear instead of synthetic materials while using Conazol?

A: Official patient guidance suggests wearing freshly washed cotton clothing, socks, and underwear instead of synthetic materials. This is because fungal infections thrive in moist conditions, and cotton helps prevent recurrence by helping to keep the affected area dry.


Q: Is Conazol effective for treating acne or bacterial skin conditions?

A: Ketoconazole is an antifungal medication that only works against fungi and yeasts. Regulatory labeling explicitly states that it will not treat infections or conditions that are caused by bacteria or viruses, which includes most forms of acne.

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How should Conazol (Ketoconazol) be stored and disposed of?

Official Storage and Disposal Requirements

Regulatory labeling mandates specific conditions for storing Ketoconazole to ensure stability and safety, which vary by formulation.

Formulation Required Storage Condition
Oral Tablet Stored at controlled room temperature (15^circC to 30^circC); must be protected from moisture and kept in a tight, light-resistant container.
Topical Forms Temperature should generally not exceed 25^circC to 30^circC. The gel formulation has a flammability warning and must be kept away from fire.

All forms of Ketoconazole must be kept out of the sight and reach of children.

For disposal, unused or expired medication must be discarded according to local regulatory requirements. Medications should generally not be flushed down the toilet or poured down a drain, but rather disposed of via local drug take-back programs.

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

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