Femizole

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Femizole

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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 Femizole

Femizole is a fixed-dose combination drug that provides a synchronized therapeutic approach to complex infections by containing two distinct, synthetic active pharmaceutical ingredients: Ketoconazole and Secnidazole.

Property Description
Active ingredient Ketoconazole (Antifungal) and Secnidazole (Antimicrobial)
Form Oral tablet or Topical/Vaginal ovule (high-level)
Pharmacological class Dual-mechanism Anti-infective: Azole Antifungal and Nitroimidazole Antimicrobial
Common use Targeting mixed infections (fungal and protozoal/bacterial)
Origin Synthetic chemical compounds

What Type of Medicine is Femizole?

Femizole is classified as a broad-spectrum Anti-infective designed to deliver its full therapeutic action simultaneously. The first component, Ketoconazole, is categorized as an Imidazole Antifungal agent. The second component, Secnidazole, is classified as a Nitroimidazole Antimicrobial and an effective Antiprotozoal agent. This specific pairing—an antifungal with an antimicrobial—is clinically recognized for its utility in addressing conditions where polymicrobial involvement is either confirmed or highly suspected, offering a comprehensive strategy against various co-existing pathogens.

Composition: Active Ingredients and Dual Classification

The active core consists of Ketoconazole and Secnidazole. Ketoconazole functions as the Antimycotic by targeting fungal cell membrane stability, while Secnidazole operates as the potent Antimicrobial component. This fixed-dose combination is a synthetic approach to therapy. For products designated for topical/vaginal use, the medicine is commonly prepared as an ovule, a specialized form tailored for local route of administration, which differs from typical oral tablet formulations. The evidence confirms that this type of combination therapy is used in the syndromic management of lower genital infections where mixed pathogens are prevalent.

Regulatory References

  1. Ketoconazole - StatPearls - NIH
  2. Secnidazole (SOLOSEC) Label - DailyMed - NIH

What side effects are possible with Femizole?

Possible Side Effects and Safety Information

This information is based strictly on documentation from government health authorities, detailing officially documented adverse reactions and safety restrictions.

Frequency-Classified Adverse Reactions

The following are side effects documented in regulatory labeling, categorized by how frequently they occurred in clinical studies:

Classification Examples of Reactions
Very Common (Affects ge 1 in 10) Hot flashes, Joint pain (arthralgia), Fatigue, Increased sweating, High cholesterol (hypercholesterolemia).
Common (Affects ge 1 in 100 to <1 in 10) Headache, Dizziness, Nausea, Depression, Bone pain, Osteoporosis, Bone fractures, Hair loss (alopecia).
Uncommon (Affects ge 1 in 1,000 to <1 in 100) Heart palpitations, Ischaemic cardiac events (e.g., angina), Blood clots (thrombophlebitis), Stroke, Cataracts.

Serious Safety Risks and Contraindications

Serious Adverse Reactions documented in regulatory sources include ischemic cardiac events (such as myocardial infarction), hepatitis, and tendon rupture (rarely). The risk of bone fractures is also documented, often associated with a decrease in Bone Mineral Density (BMD).

Contraindications and Restrictions:

  • Pregnancy: Femizole is contraindicated (must not be used) in women who are or may become pregnant due to the risk of fetal harm (Embryo-Fetal Toxicity).
  • Monitoring: The official safety profile requires monitoring of Bone Mineral Density and serum cholesterol levels during treatment due to the documented risks of osteoporosis and hypercholesterolemia.
  • Duration-Related Risks: The risk of low BMD and subsequent fractures is a cumulative concern over the course of extended treatment.
  • Impaired Performance: Due to the potential for fatigue, dizziness, and somnolence, caution is advised when performing tasks that require mental alertness, such as driving or operating machinery.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose Scope

Official regulatory information regarding Femizole (letrozole) overdose in humans is limited. The documented experience is primarily based on studies in healthy male volunteers who received single oral doses up to 30 mg. In these circumstances, no dose-related adverse events were observed. This dose is twelve times higher than the recommended therapeutic dose.

Since specific clinical manifestations for an acute overdose of this substance have not been established in the labeling, any suspected or known overdose requires immediate medical attention.

Emergency Response

In the event of a suspected overdose, the prescribed emergency action is to initiate general supportive treatment and perform frequent monitoring of vital signs. The official regulatory text emphasizes that, due to limited experience, any overdose must be managed symptomatically by a healthcare professional.

When to seek immediate medical help: Urgent medical attention is required for any known or suspected overdose. Individuals should contact their local poison control center or emergency services promptly if they have taken more than the prescribed amount. Do not wait for symptoms to appear.

Therapeutic Uses of Femizole

What Femizole Treats: Main Uses and Benefits

The primary role of Femizole is in addressing complex polymicrobial infections in the lower genital tract, which involve the simultaneous presence of distinct pathogens. The medication is commonly used in conditions presenting with acute episodes, and is applied across domains where additional symptomatic support is needed. Specifically, it is relevant for managing Vulvovaginal Candidiasis (fungal species), Bacterial Vaginosis (anaerobic bacteria), and Trichomoniasis (protozoa). This dual-action approach is applicable within clinical settings that involve acute or disruptive symptom patterns, providing a strategic benefit of comprehensive coverage against co-existing pathogens that often lead to recurrent symptoms. The combination is relevant for a strategic approach when multiple sources of distress are likely.

The treatment supports the management of acute symptom clusters that create noticeable interference with daily stability. This includes intense vulvovaginal pruritus (itching), persistent burning sensations, local irritation, and the syndrome of abnormal, foul-smelling discharge. In managing symptoms related to inflammatory or irritative states, Femizole contributes to easing the overall symptom load and offers symptomatic relief that helps patients cope more steadily with difficult episodes.

“The primary utility of the combination is to address the high clinical probability of co-existing fungal, bacterial, and protozoal infection patterns.”

Quick Fact: Relief for Vulvovaginal Discomfort Femizole is considered relevant for easing symptoms related to inflammatory or irritative states, assisting with maintaining functional stability during episodes of heightened discomfort.

Eligibility and Restrictions for Use

Official Eligibility and Non-Eligibility Status

The eligibility profile for Femizole, a fixed-dose combination drug, is defined by the strictest population constraints documented in governmental regulatory labeling for its components, Ketoconazole and Secnidazole.

Populations Strictly Contraindicated

Femizole must not be used by patients who fall into the following categories, as they represent absolute non-eligibility based on officially documented risks:

  • Patients with Acute or Chronic Liver Disease or underlying Hepatic Impairment, including those with baseline liver enzyme levels (e.g., ALT/AST) greater than 2 times the upper limit of normal.
  • Individuals with known Adrenal Insufficiency.
  • Patients with a documented Hypersensitivity to Ketoconazole, Secnidazole, or any derivative of the nitroimidazole chemical class.
  • Patients diagnosed with Cockayne Syndrome.

Age-Based and Conditional Use Restrictions

Population Group Regulatory Status
Approved Age Group Adults and adolescents ge 12 years of age.
Pediatric Use (under 12) Safety and efficacy have not been established.
Pregnancy Data are generally insufficient; use is restricted to cases where documented benefit justifies the risk.
Lactation Breastfeeding is not recommended during treatment and for a period of 96 hours after the final dose.
Renal Impairment Generally permitted; no specific dose adjustment is required according to official labeling.

These official statements define a clear boundary: use is established for adults and older adolescents, but it is strictly prohibited in the presence of specific organ dysfunction or underlying disease.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Femizole (assumed to be Letrozole/Femara) is known to interact with certain other medicinal products, with the official regulatory profile focusing on a limited set of substances and drug classes. These documented interactions are based on pharmacokinetic studies and clinical experience, establishing necessary precautions for co-administration.


Documented Pharmacokinetic Interactions

The most significant interaction concerns Tamoxifen. Co-administration of Femizole and Tamoxifen has been shown to result in a reduction of Femizole plasma levels by approximately 38%. Despite this documented reduction, clinical data has indicated that the therapeutic effect of Femizole was not impaired when it was administered immediately following Tamoxifen.

Conversely, official studies examining the co-administration of Femizole with Cimetidine and Warfarin found no clinically significant effect on the pharmacokinetics of Femizole or the respective co-administered drugs. This indicates that dose adjustments are typically not required for these specific combinations.


Interaction-Related Restrictions

Co-administration of Femizole with estrogen-containing products is generally avoided. Because Femizole works by significantly lowering estrogen levels, administering it with products containing estrogen could counteract its therapeutic mechanism and reduce the drug’s effectiveness. This represents a significant drug class restriction outlined in official labeling, primarily due to the opposing actions of the substances.

Mechanism of Action

How Femizole Works: Mechanism of Action

Femizole utilizes a dual-mechanism of action by combining two distinct synthetic agents, each targeting a unique core component of different microbial pathogens. This strategy employs two entirely separate biological pathways to achieve its physiological effect.


Inhibiting Fungal Cell Membrane Synthesis

One component acts as an inhibitor against a critical fungal enzyme, lanosterol 14alpha-demethylase (CYP51A1) . By blocking this enzyme, the drug disrupts the ergosterol biosynthesis pathway, which is essential for creating the structural sterols of the fungal plasma membrane. This results in the compromise of fungal cell integrity and leads to growth arrest (fungistasis) or cell death (fungicidal action).


Destroying Anaerobic Pathogen DNA

The second component utilizes a mechanism dependent on its bioactivation by specific nitroreductase enzymes found in anaerobic bacteria and protozoa. This activation process generates highly destructive radical anions that chemically damage the pathogen's DNA and essential macromolecules. This targeted destruction prevents the organisms from replicating or repairing themselves, achieving a cidal action that results in microbial cell death.

Dosage and Administration Information

How to use Femizole

Femizole, a fixed-dose combination drug, is administered through two distinct official routes: Oral (tablet or granule) and Topical/Vaginal (ovule), according to the defined therapeutic protocol. The specific form dictates the administration principles and the intended duration of the course.

The Oral Regimen is based on the single, complete 2-gram dose of the Secnidazole component, which constitutes a single-day course of therapy. This regimen is officially specified for patients 12 years of age and older. For oral granule forms, the contents must be sprinkled onto a small amount of soft food, such as applesauce or yogurt, and consumed whole. The entire mixture must be consumed within 30 minutes of preparation and may be taken without regard to the timing of meals. It is a procedural requirement that the granules are not chewed, crushed, or dissolved in liquid.

Alternatively, the medicine is used for Topical/Vaginal administration as an ovule. This regimen involves the application of one unit once daily for a fixed, short-term course, often spanning seven to fourteen consecutive days. The application is typically scheduled at bedtime to support the standardized administration protocol. These instructions define the precise procedural constraints for the use of this medicine.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Femizole

The clinical evidence base supporting the fixed-dose components of Femizole is based on research that examines the use of its two active ingredients—an antifungal (Ketoconazole) and an antimicrobial (Secnidazole)—for their respective target pathogens. This body of evidence primarily describes patterns observed in trials focused on short-term symptom changes and pathogen clearance.


Evidence for Use in Fungal Infections (Vulvovaginal Candidiasis)

Research has explored the antifungal component, Ketoconazole, in studies evaluating Vulvovaginal Candidiasis (VVC). These studies included Randomized Controlled Trials (RCTs) and Systematic Reviews that measured mycological eradication (confirming the clearance of fungal organisms) and tracked the research endpoint of clinical cure, which researchers defined as the measure of signs and symptoms such as pruritus and local burning. This large body of evidence is primarily structured for the Ketoconazole component as monotherapy or in combination with different antifungals. Data for the specific fixed-dose pairing with Secnidazole is limited in major regulatory summaries.


Evidence for Use in Bacterial and Protozoal Infections (BV/Trichomoniasis)

The antimicrobial component, Secnidazole, was evaluated in trials exploring symptom patterns in conditions such as Bacterial Vaginosis (BV) and Trichomoniasis (TV). The evidence base includes Phase 3 Randomized, Double-Blind, Placebo-Controlled Trials that research examined microbiological cure (confirming pathogen eradication) and clinical response, measured by outcomes related to physical discomfort. The foundational evidence focuses on studies that evaluated oral Secnidazole monotherapy for BV and TV. Evidence remains limited regarding studies that specifically assess the combined topical/vaginal formulation containing both Secnidazole and Ketoconazole.


What Remains Uncertain in the Research Landscape

Research exploring the combination product contributes to the broader evidence landscape, but key knowledge gaps remain. The comparative evidence is lacking for the specific Ketoconazole and Secnidazole fixed-dose combination when measured directly against other monotherapies. Also, evidence quality varies across studies, and some trials used modest sample sizes or open-label designs, which makes findings for certain groups uncertain. Furthermore, long-term effects and the durability of the effect after therapy discontinuation are not fully established.

Frequently Asked Questions (FAQ)

Common questions about Femizole (FAQ)


Q: Is Femizole a type of antibiotic?

Femizole is classified as a dual-mechanism anti-infective. It combines an Azole Antifungal with a Nitroimidazole Antimicrobial, which is a type of medicine often generally referred to as an antibiotic. This combination allows it to target both fungal and certain bacterial or protozoal pathogens.


Q: Does Femizole interact with common birth control pills?

Official documents caution against co-administering Femizole with estrogen-containing products, which include many common birth control pills. This restriction is due to the drug’s mechanism, which involves lowering estrogen levels; taking it with estrogen could counteract its intended therapeutic effect.


Q: Is Femizole safe to use during pregnancy?

According to the official safety information, Femizole is strictly contraindicated for use during pregnancy or for women who may become pregnant. This restriction is based on documented risks of fetal harm.


Q: Is Femizole safe to use while breastfeeding?

Official regulatory documentation states that breastfeeding is not recommended while undergoing treatment with Femizole. Regulatory documents state this restriction applies for a period of at least 96 hours (four days) following the final dose.


Q: Can people with kidney problems use Femizole?

Official labeling indicates that for patients with renal impairment (kidney problems), there is typically no specific dose adjustment required for Femizole. Patients are advised to discuss any pre-existing kidney conditions with a healthcare professional.


Q: What specific warnings are listed on the Femizole label?

The official label includes serious safety information such as the potential risk of ischemic cardiac events, hepatitis, and tendon rupture (rarely). It also warns about decreased Bone Mineral Density (BMD), which can lead to bone fractures, and notes the potential for fatigue/dizziness that may require caution.


Q: Does Femizole require any special monitoring or blood tests?

According to official safety documents, monitoring is required for both Bone Mineral Density (BMD) and serum cholesterol levels during treatment. This monitoring addresses the documented risks of osteoporosis and hypercholesterolemia.


Q: How strong is the evidence base for Femizole?

Official summaries indicate that the evidence base is primarily derived from studies of the drug's individual components (antifungal and antimicrobial agents). Official overviews note that comparative evidence against other single-agent therapies is lacking, and some trials have used modest sample sizes or open-label designs.


Q: Can Femizole be taken with or without food?

For the oral granule form, official instructions state it may be taken without regard to the timing of meals. The topical/vaginal ovule form is typically scheduled for application at bedtime, which is a different administration constraint.


Q: Does Femizole have a black box warning?

One of the active components, Ketoconazole, is associated with an FDA Boxed Warning. This is the agency's strongest warning and concerns the risks of hepatic toxicity (liver damage) and serious drug interactions.


Q: Does using Femizole make other medications less effective?

Official documents highlight that Femizole’s mechanism involves significantly lowering estrogen levels in the body. Therefore, co-administration with estrogen-containing products could counteract this effect and reduce the effectiveness of those estrogen products.


Q: Why is Femizole only approved for specific patient populations?

Official eligibility is restricted due to specific safety concerns documented in regulatory reviews, such as the risk of embryo-fetal toxicity and severe liver disease. Additionally, safety and efficacy have not been established for certain patient populations, notably children under the age of 12.


Q: Can Femizole be used for conditions other than its main approved use?

Official regulatory documentation only provides information for the approved uses of Femizole, which are for targeting mixed fungal, bacterial, and protozoal infections. Information regarding its use for other conditions is not contained in the official label.


Q: What happens if I miss a dose of Femizole?

Official instructions describe taking a missed dose as soon as it is remembered. However, if it is nearly time for the next scheduled dose, the regulatory guidance directs skipping the missed dose and resuming the regular schedule without taking two doses at once.


Q: How long can a person safely use Femizole?

While a single course of treatment is short-term, the risk of low Bone Mineral Density (BMD) and subsequent fractures is documented as a cumulative concern. This indicates that if treatment is extended or repeated, monitoring the duration may be warranted due to these potential cumulative effects.


Q: Is it normal to feel a mild headache when starting Femizole?

Headache is a Common side effect documented in official regulatory profiles, meaning it affects at least 1 in 100 users. This is factual information based on clinical trial data.


Q: Are there any long-term side effects associated with Femizole use?

Studies and official information indicate that long-term use is associated with duration-related risks. These risks include decreased Bone Mineral Density (BMD) and a resulting increased potential for bone fractures.


Q: Does Femizole cause weight gain or weight loss?

Official regulatory documents include both weight gain and weight loss as reported side effects. These effects were documented during clinical monitoring of the drug's components.


Q: Can Femizole affect mood or cause anxiety?

Documented side effects listed in official profiles include depression and anxiety. Other effects that may impact mental state include dizziness and somnolence (sleepiness).


Q: Does Femizole interact with alcohol?

Official warnings state that alcohol consumption should be avoided during treatment with Femizole. Regulatory warnings state that this avoidance applies for a period of at least two days after the final dose to prevent possible adverse reactions like flushing, vomiting, and headache.


Q: What foods or supplements should be avoided while taking Femizole?

Official information indicates that certain substances may interact with the drug's components. Interactions have been noted with specific supplements, such as DHEA, and with certain foods like grapefruit juice.


Q: Can men use Femizole for certain conditions?

The antimicrobial component, Secnidazole, has been evaluated in trials and is FDA-approved for conditions such as trichomoniasis in men. The full eligibility profile is based on the condition being treated and the patient's medical history.


Q: What should I do if the side effects of Femizole don't go away?

Persistent or bothersome side effects are grounds for immediate consultation with a healthcare professional. Official patient counseling guidelines instruct users to seek medical advice for ongoing concerns.


Q: Is it true that Femizole can cause discoloration of urine?

Official regulatory documents report that discoloration of the urine has been a documented side effect of the medicine's components. This discoloration may cause the urine to appear dark-colored.


Q: Are there any known allergic reactions to Femizole?

Official safety profiles have documented serious allergic reactions, including signs of hypersensitivity. These reactions may include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat.


Q: Does Femizole affect fertility?

Studies and official information indicate that the drug or its components may affect fertility in both men and women. This is a documented consideration related to the drug's safety profile.


Q: Why do some users report stomach upset with Femizole?

Nausea, vomiting, and stomach pain are documented as Common side effects in the official regulatory profiles. This is a known adverse reaction pattern associated with the medicine's components.


Q: What happens if Femizole is accidentally frozen or left in a hot car?

To maintain its stability and effectiveness, the medicine must be stored at a controlled room temperature, protected from moisture, and should not be frozen. Exposing the product to high or low extreme temperatures can compromise the medicine's integrity.


Q: Is Femizole known to cause photosensitivity (sun sensitivity)?

Increased sensitivity to sunlight, also known as photosensitivity, has been reported as a documented side effect of one of the active components. Regulatory documents indicate that appropriate precautions when exposed to UV light may be warranted.


Q: What are the signs that Femizole is not working for me?

A perceived lack of improvement in symptoms or a worsening condition should prompt consultation with a healthcare professional. Official patient guidance is non-directive on clinical judgment.


Q: Do I need to finish the entire course of Femizole if I feel better?

Any potential change in the prescribed treatment duration requires consultation with a healthcare professional. Official regulatory documents do not provide self-administered instruction on altering the course of therapy.


Q: What is the risk of overdose with Femizole?

Official prescribing information includes a section on the risk of overdose, which can potentially lead to severe gastrointestinal issues, liver damage, and heart rhythm abnormalities. Immediate medical attention is necessary if an overdose is suspected.


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

Pharmacokinetic data, which describes how long the medicine stays in the body, is available in the official labeling. This data indicates, for example, that approximately 15% of the Secnidazole component is excreted unchanged in the urine.


Q: What is the physical appearance of the Femizole tablet/capsule?

Femizole is supplied in different forms, including an oral tablet and a topical/vaginal ovule. The specific physical appearance details (such as color, shape, and markings) are documented in the manufacturer's packaging section of the full official label.


Q: Where can I find the official prescribing information for Femizole?

The official prescribing information, also known as the full label, is available to the public on the websites of government health authorities. These sources include the FDA (DailyMed) in the US and the EMA (SmPC) in Europe.

How should Femizole be stored and disposed of?

How to Store and Dispose of Femizole?

The storage and disposal instructions for Femizole, a combination of Ketoconazole and Secnidazole, are defined by regulatory labeling requirements to maintain product stability and safety.

Storage Component Official Regulatory Requirement
Temperature Store at controlled room temperature (20 C to 25 C), with excursions permitted up to 30 C.
Environment The medication must be protected from moisture and direct light; it must not be frozen.
Packaging Keep the product in its original, tightly closed container and store out of the reach and sight of children.

The official disposal protocol for unused or expired medicine mandates that it must not be flushed down the toilet or sink. Instead, the product should be mixed with an undesirable substance (e.g., used coffee grounds) and placed in a sealed bag for disposal in household trash, or returned via a drug take-back program if available.

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

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