Vagizol

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Medically reviewed

Marina Burgos

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 Vagizol

Property Description
Active Ingredient Metronidazole
Form Vaginal Suppositories (Pessaries)
Pharmacological Class Antiprotozoal and Antibacterial Agent
Origin Synthetic Nitroimidazole Derivative
Administration Route Intravaginal (Local Application)

Vagizol: Identity and Pharmacological Class

Vagizol is a pharmaceutical preparation classified as a nitroimidazole antimicrobial, functioning as both a synthetic antiprotozoal and antibacterial agent. Its foundational activity is derived from the single active ingredient, Metronidazole. This compound is a synthetic derivative whose efficacy is clinically recognized for its action against specific susceptible pathogens. Metronidazole is a core anti-infective agent used to treat infections caused by anaerobic pathogens. This classification means the medicine is specifically designed to eliminate harmful microorganisms that thrive without oxygen.


Composition and Localized Dosage Form

Vagizol is manufactured as Vaginal Suppositories (or pessaries), which are solid forms intended exclusively for intravaginal administration—a delivery system that ensures local application. The suppository's general composition involves the Metronidazole active substance uniformly dispersed within a lipophilic base, typically hard fat or semi-synthetic glycerides. This base allows the preparation to melt or dissolve at the body's temperature, releasing the medicine to achieve a high, localized concentration directly at the site of infection as a topical preparation.


General Purpose and Targeted Anti-Infective Role

The general purpose of Vagizol is to provide focused anti-infective therapy by eliminating the microorganisms responsible for localized conditions, such as those that commonly affect the vaginal microenvironment. Nitroimidazoles provide bactericidal action against a clinically significant range of anaerobes. By actively destroying susceptible microbial agents, the drug supports the resolution of the infectious process, which, in turn, helps to relieve discomfort and restore the local microbial environment.

Regulatory References

  1. Read about Metronidazole on MedlinePlus
  2. anti-infective therapy

What side effects are possible with Vagizol?

Official Classification of Adverse Reactions

The safety profile for the active ingredient, Metronidazole, is structured by classifying adverse reactions based on their frequency and the system-organ class affected, as defined by regulatory documents. Effects observed in clinical use are officially categorized as Common or Uncommon.

Classification Examples of Reactions Affected System-Organ Class
Common (ge 1%) Headache, nausea, vulvovaginal candidiasis (yeast infection), vulvovaginal pruritus, abdominal pain, diarrhea. Nervous System, Gastrointestinal, Infections & Infestations, Genitourinary
Uncommon (< 1%) Depression, dizziness, constipation, allergic reaction, urticaria. Nervous System, Gastrointestinal, Skin & Subcutaneous Tissue

Serious Adverse Reactions and Safety Constraints

The regulatory profile documents specific, rare, but clinically significant adverse reactions. Serious neurological events such as convulsive seizures, peripheral neuropathy (numbness/paresthesia), and signs of encephalopathy are associated with metronidazole, and the development of abnormal neurological signs requires the discontinuation of treatment. Hematological changes such as reversible neutropenia (low white blood cell count) have also been documented.

Specific Safety Constraints are formally included in regulatory labeling:

  • Hepatic Impairment: Caution is advised in patients with severe liver disease, and dosage adjustment may be required due to the risk of accumulation. The drug is contraindicated in individuals with Cockayne syndrome due to the risk of acute hepatic failure.
  • Drug Restrictions: Co-administration with Disulfiram is prohibited. Ingestion of alcohol/ethanol is also strictly restricted during therapy and for a specified period after treatment ends due to the risk of a disulfiram-like reaction (e.g., flushing, vomiting, headache).

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose involving Metronidazole, the active ingredient in Vagizol, is primarily documented through systemic exposure and may present with specific clinical manifestations. Officially reported signs in acute overdose cases, which include ingestion of large single oral doses, include gastrointestinal distress, such as nausea and vomiting, alongside neurological symptoms like ataxia (loss of control of body movements).

Documented Overdose Manifestations Severe Outcomes
Nausea, Vomiting, Ataxia Convulsive Seizures, Encephalopathy

Emergency Actions and Management

Regulatory guidance directs that no specific antidote is known for Metronidazole overdose. Management is therefore limited to symptomatic and supportive therapy. Official government instructions emphasize the need to seek immediate medical attention for the development of severe signs. Immediate help is required if a person collapses, experiences a seizure, has trouble breathing, or cannot be awakened. Users should also contact a Poison Control Center for guidance.

Specific Overdose Considerations

A severe, population-specific risk is documented for patients with Cockayne Syndrome, where Metronidazole use is associated with a rapid onset of severe and potentially fatal acute liver failure. Additionally, patients with severe hepatic impairment may experience drug accumulation, which can heighten the risk of adverse neurological events such as encephalopathy.

Therapeutic Uses of Vagizol

What Vagizol Treats: Main Uses and Benefits

Vagizol is commonly used in clinical settings that involve acute or unstable symptom patterns, and is considered relevant for the management of conditions characterized by the overgrowth of susceptible anaerobic bacteria. This therapeutic application is relevant for managing conditions that produce a significant symptomatic burden, providing support that helps ease the overall symptom load. The medication is commonly used to help with the management of vaginal infections caused by susceptible organisms, such as Bacterial Vaginosis (BV) and Trichomonas vaginalis infection.


The most common real-world use involves addressing the distressing symptoms that interfere with daily functioning, such as abnormal vaginal discharge, unpleasant odor, localized itching, and a burning sensation. Used when groups of symptoms appear suddenly, the treatment contributes to improved comfort during periods of heightened symptoms. It is applied across domains where additional symptomatic support is needed.

“Applied during phases of increased distress, this treatment supports patients by easing the associated discomfort and assists with maintaining functional stability.”

Quick Fact: Relief for Discharge and Odor Vagizol is commonly used to help manage symptom clusters that create noticeable physiological strain, assisting in easing the impact on daily functioning.

Regulatory References

  1. Metronidazole Vaginal: MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Vagizol — Official Regulatory Information

The eligibility for using Vagizol is strictly defined by regulatory documents, imposing specific restrictions and absolute prohibitions on certain patient populations.


Eligibility Scope

Populations for Whom Use is Allowed:

  • Adult Females.
  • Females 12 years of age and older (established for certain formulations).

Populations for Whom Use is Contraindicated:

  • Patients with a prior history of hypersensitivity to metronidazole, other nitroimidazole derivatives, or formulation ingredients.
  • Patients who have taken Disulfiram within the preceding two weeks.
  • Individuals consuming alcohol during treatment and for a specified time after therapy.

Age and Condition-Related Limitations

Safety and efficacy have not been established in the pediatric population under 12 years of age. Use is subject to caution in patients with certain underlying conditions. This includes individuals with severe hepatic disease, Central Nervous System (CNS) disorders, or a history of blood dyscrasias.

Pregnancy and Lactation: Use during pregnancy is permitted only if clearly needed. The medicine is not recommended for lactating women, who may be advised to interrupt breastfeeding for a specified period.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile of Vagizol (Metronidazole) is based on official regulatory documentation and emphasizes systemic effects despite the intravaginal administration route. The profile contains substances that are strictly contraindicated and others that require careful monitoring due to altered systemic drug exposure.

Mandatory Avoidance and Contraindicated Combinations

Co-administration with Alcohol/Ethanol or products containing Propylene Glycol is officially prohibited. This is due to the risk of a severe Disulfiram-like reaction. The combination of Metronidazole and Disulfiram is also contraindicated, associated with the development of psychotic reactions. The regulatory label advises against initiating Metronidazole therapy in patients who have taken Disulfiram within the preceding two weeks.

Clinically Significant Exposure Modification

Metronidazole can significantly alter the exposure of several co-administered medicines. The drug potentiates the anticoagulant effect of Warfarin and other oral coumarins, which prolongs Prothrombin Time. Metronidazole also reduces the clearance of Busulfan, Cyclosporine, and 5-Fluorouracil, leading to increased plasma concentrations of these drugs. Conversely, drugs like Phenobarbital can reduce Metronidazole plasma concentrations, while Cimetidine may increase them by decreasing clearance.

Population-Specific Notes

The risk of interaction-related effects may be heightened in patients with Severe Hepatic Impairment due to impaired drug removal. Metronidazole is also contraindicated in patients with Cockayne Syndrome due to reported hepatotoxicity risk.

Mechanism of Action

How Vagizol Works: Mechanism of Action

Vagizol's mechanism of action relies entirely on a process of selective toxicity against specific anaerobic organisms. The active ingredient itself is a prodrug that must be enzymatically activated by the target pathogen.


Nitroreductase Activation and Anaerobic Specificity

The active ingredient, metronidazole, must be chemically converted within the target cell to generate the cytotoxic intermediate. This conversion is enabled by low-potential electron-transport proteins and nitroreductase enzymes found exclusively in anaerobic (low-oxygen) bacteria and protozoa. This specialized activation mechanism limits the prodrug reduction process to organisms exhibiting a low redox potential.


Microbial DNA Disruption and Cytotoxicity

Once activated, the resulting highly reactive chemical compounds—chiefly nitro radical anions—covalently bind to the microbe's DNA. This molecular interaction causes irreversible DNA strand breakage and disruption of nucleic acid synthesis, which is the final step in the cascade. The consequence of this damage is rapid microbial cell death (bactericidal/protozoacidal), resulting in the irreversible destruction of the susceptible microbial population.

Dosage and Administration Information

Vagizol is a pharmaceutical preparation containing Metronidazole, intended exclusively for intravaginal administration as a 500 mg suppository (pessary) for local application. Standard usage guidelines describe the parameters for proper adherence to the labeled protocol.

Administration and Dosage Protocol

The adult regimen requires the application of one 500 mg suppository once daily. This dose is typically scheduled for bedtime to facilitate maximum localized contact and retention of the active ingredient. The suppository must be inserted deeply into the vagina, usually while lying down.

Usage Parameter Guideline
Route and Form Intravaginal application of the 500 mg suppository only.
Frequency Once daily (typically at night).
Course Duration A fixed course of 7 to 10 days, with a maximum limit of 10 days per single treatment course.
Usage Limit Repeat treatment courses are limited to a maximum of 2 to 3 per year.

Contextual and Population-Specific Instructions

Prescribing information includes specific instructions for procedural constraints and patient populations. For infections caused by Trichomonas vaginalis, the regimen requires the simultaneous treatment of the sexual partner with an appropriate oral formulation of Metronidazole. Additionally, the suppository base may affect the integrity of latex barrier contraceptives.

Specific dosage adjustments apply for certain patients: in cases of severe liver impairment, the daily dose is reduced to approximately one-third of the standard amount. For patients undergoing hemodialysis, the dose should be administered after the procedure is complete. The use of this 500 mg vaginal suppository formulation is generally restricted to adult patients.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Vagizol

The research evidence for Vagizol, which contains metronidazole, focuses on its application as a local anti-infective agent. The evidence base primarily consists of clinical trials and systematic reviews examining what happens in studies of specific infections. This overview describes what types of studies have been conducted, what outcomes they monitored, and where data remain insufficient, without offering clinical advice.


I. Evidence for Use in Bacterial Vaginosis (BV)

The evidence for intravaginal metronidazole primarily comes from short-term Randomized Controlled Trials (RCTs) where Bacterial Vaginosis (BV) was observed. These studies were designed to assess outcomes related to physical discomfort and the measurement of bacterial load changes. Research examined changes in patient-reported outcomes describing perceived discomfort, like abnormal discharge and odor, as well as laboratory measures of bacteriological cure.

Across the observed populations—primarily adult women of reproductive age—studies reported changes measured in the short-term, typically within two weeks after the treatment period ended. Research also explored comparisons between the use of the vaginal suppository form and other treatment options, including the oral metronidazole formulation or a placebo.


II. Evidence for Use in Trichomoniasis

Research examined the use of intravaginal metronidazole in Trichomonas vaginalis infection. Studies monitored outcomes linked to inflammatory or irritative states and monitored the presence of the parasite itself. These clinical trials primarily focused on achieving microbiological cure, verified through laboratory testing for the parasite.

Findings indicate that local application was studied for associations with the absence of the parasite at the site of administration as measured by diagnostic tests. However, certainty remains low regarding the role of local therapy alone. Major clinical guidelines often prioritize systemic (oral) treatment to cover potential extra-vaginal sites of infection and for treating sexual partners, which impacts the applicability of local-only evidence.


V. What Remains Uncertain in the Research Landscape

Several limitations have been noted in the existing evidence base. Follow-up durations were limited in many primary BV studies, which means the overall durability of the measured response is not fully established. The evidence quality varies across studies due to differences in design, diagnostic criteria, and population characteristics. Data for certain groups, such as adolescent and post-menopausal women, remain insufficient. Furthermore, comparative evidence is lacking when assessing the long-term data for the vaginal preparation versus oral therapy in preventing BV recurrence.

Key Studies & References

  1. Metronidazole: MedlinePlus Drug Information
  2. Metronidazole Vaginal: MedlinePlus Drug Information

Frequently Asked Questions (FAQ)

Common questions about Vagizol (FAQ)


Q: Is Vagizol an antibiotic?

A: Official medical documents classify the active ingredient in Vagizol as an antibacterial and antiprotozoal agent, belonging to the nitroimidazole class of antimicrobials. While it is used to treat infections caused by susceptible bacteria and parasites, its specific mechanism of action targets only certain microorganisms.

Q: Does Vagizol affect hormonal birth control?

A: Regulatory information for the active ingredient suggests that it may reduce the effectiveness of some oral hormonal contraceptives in some women. Individuals relying on hormonal birth control often seek guidance from a healthcare professional to determine if a backup or alternative method may be relevant during treatment.

Q: Can Vagizol be used with other vaginal products like douches or lubricants?

A: Official patient information often indicates that therapeutic douches are generally unnecessary and sometimes inadvisable during metronidazole therapy. The suppository base may also affect the integrity of latex barrier contraceptives. Consultation with a healthcare professional is often recommended concerning the use of other products, including lubricants, during the course of therapy.

Q: How quickly does Vagizol start working?

A: The onset of noticeable symptom improvement can vary among individuals. Official data indicates that the active ingredient is absorbed gradually after vaginal administration, with peak concentrations appearing several hours after dosing. The medicine’s overall effect is achieved by maintaining a sufficient localized concentration to disrupt the target microbial population over the full course of treatment.

Q: How long does the effect of Vagizol last after stopping use?

A: The duration of the medicine’s presence in the body is linked to its elimination half-life, which is approximately eight hours in healthy individuals. While the medicine is cleared from the body relatively quickly, the full duration of the measured response from the treatment, or its durability against recurrence, may vary, and is an area where research evidence remains limited.

Q: How is Vagizol different from common yeast infection creams?

A: Vagizol is officially classified as an an antibacterial and antiprotozoal agent intended to treat infections caused by susceptible anaerobic bacteria and parasites. This distinguishes it from common creams used to treat vaginal yeast infections (candidiasis), which are caused by a fungus and require an antifungal medication.

Q: Is it normal to feel a burning sensation when I first use Vagizol?

A: Official documents classify local discomforts, such as vaginal burning, itching (pruritus), or irritation in the genital area, as common or uncommon adverse reactions. If these sensations are noted as severe, or if new or worsening symptoms develop, the official guidance is to contact a healthcare professional.

Q: Can Vagizol cause tiredness or dizziness?

A: Official regulatory documents list dizziness as an uncommon adverse reaction associated with the medicine. Furthermore, some sources reference extreme tiredness as a symptom that may accompany a rare but serious blood problem linked to the drug's active ingredient.

Q: Does Vagizol treat all types of infections?

A: No, Vagizol is a specialized nitroimidazole antimicrobial that works only against specific susceptible microorganisms, including certain anaerobic bacteria and protozoa. It is not indicated or effective against all types of infections, such as those caused by viruses or common aerobic bacteria.

Q: Is Vagizol available over the counter?

A: The active ingredient in Vagizol, metronidazole, is considered a powerful antimicrobial agent. Due to its classification and potential for interactions and specific usage protocols, the product is generally available only with a prescription from a healthcare provider in most countries with regulatory bodies.

Q: Is Vagizol safe to use if I am trying to conceive?

A: Official regulatory guidance regarding the active ingredient focuses primarily on its use during pregnancy and lactation. Specific regulatory information on the drug's effect on pre-conception or fertility is limited. Individuals planning pregnancy often seek guidance from a healthcare professional.

Q: Is Vagizol suitable for postmenopausal women?

A: Regulatory documents state that use is generally permitted for Adult Females. However, the summary of research evidence notes that data for certain populations, such as post-menopausal women, remain insufficient compared to the primary population of reproductive-age women studied.

Q: Can Vagizol be used by men?

A: The Vagizol product is formulated as a vaginal suppository intended exclusively for intravaginal administration. While infections like Trichomonas vaginalis require the simultaneous treatment of the sexual partner, this is typically done using an appropriate oral formulation of metronidazole, not the Vagizol suppository.

Q: Can Vagizol interfere with lab tests?

A: Yes, regulatory precautions indicate that the active ingredient is known to interfere with the results of certain types of laboratory tests. Healthcare providers should be informed if a patient is taking this medication before specific lab procedures are conducted.

Q: Is Vagizol a common cause of drug interactions?

A: The official interaction profile documents several clinically significant drug-drug interactions, including mandatory avoidance with alcohol and certain pharmaceuticals. Regulatory advice emphasizes the need for caution and monitoring with several co-administered drugs, which indicates a notable potential for clinically relevant interactions.

Q: Are there any restrictions on activity while using Vagizol?

A: Regulatory documents do not generally specify restrictions on common activities like physical exercise. However, patients are advised of potential central nervous system side effects like dizziness that could impair the ability to operate machinery or vehicles. Official guidance related to the condition being treated, such as Trichomoniasis, often includes restrictions on sexual activity until both the patient and their sexual partner have completed treatment.

Q: Does Vagizol contain any known allergens like latex or gluten?

A: Official product information lists the active ingredient and the formulation base, but it does not typically confirm the absence of every non-active allergen like gluten or latex in every component. Hypersensitivity to any ingredient is a contraindication, and patients with specific allergies can consult the full excipient list or a pharmacist for detailed information.

Q: Does Vagizol have a generic version available?

A: The active ingredient, Metronidazole, is a long-established compound in medicine, and generic versions of metronidazole formulations are widely available on the market. However, the availability of a specific generic equivalent for the vaginal suppository may vary depending on the regulatory region.

Q: What information is available about Vagizol's effects on the vaginal microbiome?

A: Regulatory overviews confirm that the drug is bactericidal against susceptible anaerobic bacteria and parasites, which helps restore the local microbial environment by eliminating harmful organisms. Studies also generally indicate that the drug tends to spare beneficial vaginal lactobacilli, which are often resistant to its active ingredient.

Q: Can Vagizol be used for prevention?

A: The general purpose of Vagizol is to provide anti-infective therapy for existing, diagnosed conditions caused by susceptible organisms. Regulatory guidelines define its use as a treatment for established infection, and it is not generally indicated or intended as a preventative measure.

How should Vagizol be stored and disposed of?

How to Store and Dispose of Vagizol (Clotrimazole Cream)

Official regulatory information provides specific, mandatory requirements for storing and disposing of this medication.

Storage Requirements

Condition Requirement
Temperature Store at controlled room temperature (e.g., below 25 C or 30 C).
Environment Keep in a dry place, protected from excess heat and moisture. Do not freeze.
Container Keep the medication in the original, tightly closed container until the time of use.
Safety All medication must be kept out of the sight and reach of children and pets.

Disposal Instructions

Do not dispose of this medication by flushing it down a toilet or pouring it down a sink. Unused or expired Vagizol should be disposed of through a medicine take-back program or returned to a pharmacy collection point. If these options are unavailable, follow specific governmental guidance for household disposal, which typically involves mixing the drug with an unappealing substance, sealing it in a bag, and discarding it in the trash.

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

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