Entizol

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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 Entizol

What is Entizol?

Entizol is a pharmaceutical preparation containing the active substance metronidazole. It belongs to a class of medications known as nitroimidazole derivatives, which are primarily used to treat infections caused by specific types of microorganisms, including anaerobic bacteria and certain protozoa.

Therapeutic Category and Action

As an anti-infective agent, Entizol works by disrupting the DNA synthesis of susceptible organisms. This action prevents the pathogens from replicating and effectively eliminates the infection. Because of its specific mechanism of action, the medication is effective only against anaerobic organisms—those that do not require oxygen to grow—and certain parasites.

Primary Uses

Entizol is utilized in various clinical settings to address systemic and localized infections. Its application typically covers the following areas:

  • Protozoal Infections: It is used in the treatment of conditions such as trichomoniasis, amoebiasis, and giardiasis.
  • Bacterial Infections: It is effective against serious infections caused by anaerobic bacteria, which may occur in the abdomen, pelvic cavity, or respiratory tract.
  • Surgical Prophylaxis: In certain clinical scenarios, it may be administered to prevent the development of infections caused by anaerobic bacteria during or after operative procedures.
  • Periodontal Infections: It is sometimes employed in the management of acute dental infections or severe gingivitis.

Chemical Properties

The active component, metronidazole, is known for its ability to penetrate deeply into various body tissues and fluids, including the cerebrospinal fluid, bones, and abscess cavities. This high bioavailability ensures that the medication can reach the site of infection throughout the body.

Regulatory References

  1. NIH MedlinePlus Drug Information

What side effects are possible with Entizol?

Possible Side Effects and Safety Information

The safety profile of Entizol (metronidazole) is derived from official regulatory documentation, highlighting a range of potential side effects and critical safety restrictions.

Documented Adverse Reactions

Side effects commonly involve the Gastrointestinal System, such as a characteristic metallic taste, nausea, vomiting, diarrhea, and abdominal discomfort. Effects on the Nervous System can include headache and dizziness. More serious nervous system effects, though less common, are documented, including peripheral neuropathy, seizures, aseptic meningitis, and encephalopathy.

System-Organ Class Examples of Reported Effects
Gastrointestinal Disorders Metallic taste, nausea, vomiting, diarrhea
Nervous System Disorders Headache, dizziness, peripheral neuropathy, seizures
Hepatobiliary Disorders Liver enzyme elevations, severe hepatotoxicity, acute liver failure
Blood and Lymphatic System Disorders Mild leukopenia (decrease in white blood cells)

Serious Safety Information

Official warnings highlight the risk of Severe Hepatotoxicity/Acute Liver Failure, particularly in patients with Cockayne Syndrome, where cases have resulted in fatal outcomes. Due to findings in chronic animal studies, unnecessary use of the drug should be avoided, and prolonged or repeated courses require careful consideration due to the potential for carcinogenicity.

Safety Restrictions and Vulnerable Populations

Concomitant Use with Alcohol and Propylene Glycol is Strictly Contraindicated. This restriction is mandated to prevent a severe disulfiram-like reaction, which can cause flushing, vomiting, and a rapid heartbeat. The safety profile also advises caution and monitoring for patients with End-Stage Renal Disease, severe hepatic impairment, and geriatric patients. Peripheral neuropathy has been associated with prolonged exposure.

Overdose and Emergency Response

The official regulatory documents state that an overdose of Entizol (Metronidazole) may present with gastrointestinal effects such as nausea and vomiting. More severe presentations primarily affect the Central Nervous System (CNS), documented as signs of ataxia (loss of muscle coordination) and peripheral neuropathy, including numbness or tingling in the extremities. Life-threatening outcomes, typically associated with high-dose or extended exposure, include convulsive seizures and encephalopathy. Regulatory documents also highlight that monitoring for signs of peripheral or central neuropathy is necessary in overdose management.

Due to the severity of these potential effects, immediate medical attention is required. If a person has collapsed, had a seizure, or is experiencing trouble breathing, emergency services (911) must be called immediately. For all other overdose concerns, contacting a Poison control helpline is mandated. Regulatory guidance confirms that no specific antidote is known; therefore, management consists exclusively of symptomatic and supportive therapy. A critical population-specific warning highlights that patients with Cockayne syndrome are at a high risk of developing severe, rapid-onset acute liver failure (hepatotoxicity).

Therapeutic Uses of Entizol

What Entizol Treats: Main Uses and Benefits

Entizol is relevant in conditions presenting with acute or disruptive episodes associated with symptoms of specific infections. As a preparation containing metronidazole, it is relevant for managing symptom clusters that may become disruptive, including those related to systemic imbalance and heightened physiological activity.

It is applied across domains where additional symptomatic support is needed to address specific infections such as amebiasis, trichomoniasis, bacterial vaginosis, and deep-seated anaerobic infections in contexts involving systemic or localized discomfort. Furthermore, it plays a role in managing symptoms linked to inflammatory or irritative processes, particularly the papules and pustules associated with rosacea.

This medication contributes to improved comfort during periods of heightened symptoms by managing the overall symptomatic burden. In clinical settings where symptoms become temporarily overwhelming, it supports the patient by easing distress.

Quick Fact: Relevant Context: Systemic Symptom Management The medication is commonly used to help with symptoms that create noticeable physiological strain, offering supportive relief in situations where patients experience acute, infection-driven discomfort.

Regulatory References

  1. Metronidazole: MedlinePlus Drug Information

Eligibility and Restrictions for Use

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

The eligibility profile for Entizol (Metronidazole) is defined by mandatory exclusions, conditional use requirements, and age-specific limitations, as stated in official government labeling (FDA, EMA, and national authorities).


Populations for Whom Use is Contraindicated

Use of Entizol is contraindicated (absolutely prohibited) for certain populations due to severe risk as specified in regulatory documents:

  • Patients with a history of hypersensitivity to metronidazole or other nitroimidazole derivatives.
  • Patients who have used Disulfiram within the last two weeks.
  • Patients diagnosed with Cockayne syndrome.
  • Use is also strictly contraindicated during the first trimester of pregnancy for treating certain infections like trichomoniasis.

Populations Requiring Restricted or Conditional Use

Certain populations may use Entizol but require close monitoring, caution, or a mandatory dose adjustment:

  • Patients with severe hepatic impairment (Child-Pugh C) require a mandatory reduced dosage.
  • Patients with End-Stage Renal Disease (ESRD) or those on hemodialysis require monitoring or dose supplementation.
  • Patients with a history of convulsive seizures or active Central Nervous System disease must use the medicine with caution.

Age-Related Eligibility Rules

  • Pediatric Use: Safety and efficacy are not established for general pediatric use, although it is an established treatment for amebiasis.
  • Geriatric Use: Older adults may require caution or dose adjustment due to age-related changes in liver function.

What should I know about interactions with other medicines?

Entizol (Metronidazole) is officially documented to interact with specific medicinal products, foods, and substances, leading to required restrictions and constraints on co-administration.

Interaction Scope and Constraints

Category Entity/Constraint Official Regulatory Classification/Effect
Specific Interacting Medicines Disulfiram, Warfarin, Lithium, Phenytoin, Busulfan, Ciclosporin, Phenobarbital, Cimetidine Agents explicitly listed in government-label interaction sections.
Interaction-Related Restrictions Alcohol (Ethanol and Propylene Glycol-containing products) Contraindicated due to risk of disulfiram-like reaction (pharmacodynamic interaction).
Timing-Based Interaction Rules Disulfiram Must not be administered to patients who have taken Disulfiram within the last 14 days.
Population-Specific Interaction Notes Severe Hepatic Impairment Reduced clearance of Metronidazole is noted, potentially increasing the risk of interaction with co-administered drugs.

Official Interaction Statements

  • Co-administration with Alcohol is prohibited during treatment and for at least 72 hours after the final dose, as officially classified as a contraindicated combination.
  • Metronidazole may potentiate the anticoagulant effect of coumarin-type agents, such as Warfarin, resulting in a prolongation of prothrombin time and an enhanced risk of bleeding.
  • Metronidazole may increase the plasma concentrations of agents including Lithium and Phenytoin due to reduced clearance, an effect classified as a pharmacokinetic interaction.
  • Agents such as Phenobarbital can accelerate the clearance of Metronidazole, reducing its plasma levels, while Cimetidine inhibits Metronidazole clearance, potentially increasing its systemic exposure.

These regulatory statements establish the product's interaction structure, necessitating mandatory separation periods and alerting to documented pharmacokinetic and pharmacodynamic effects with co-administered substances.

Mechanism of Action

Selective Prodrug Activation and Anaerobic Targeting

The mechanism of Entizol (Metronidazole) is dependent on its function as a prodrug that requires activation. This process occurs exclusively within specific microorganisms possessing low redox potential electron transport proteins, such as Ferredoxin. These enzymes donate a single electron to the drug's nitro group, transforming the inert compound into a highly reactive, cytotoxic nitro radical anion. This selective activation limits the drug's action to the anaerobic environment of the pathogen, which ensures its physiological selectivity.

Macromolecular Disruption via DNA Covalent Binding

Once formed, the nitro radical anion immediately engages in covalent binding with the pathogen's essential structures, principally its DNA. This leads to the disruption and destabilization of the nucleic acid molecule. The resulting molecular damage inhibits DNA synthesis and replication, resulting in the irreversible loss of viability, leading to a lethal effect. This molecular cascade results in the functional elimination of susceptible cellular structures.

Dosage and Administration Information

How Entizol is Used: Official Administration Guidelines

Entizol (metronidazole) is administered according to strict protocols, which specify the route, dose, and frequency of use, and any necessary adjustments. The medicine is available for Oral administration (tablets, suspension), as a Solution for Intravenous (IV) Infusion, and in Topical/Vaginal forms.


Official Dosing and Frequency Patterns

The dosage for Entizol is dependent on the condition being addressed. For systemic anaerobic bacterial infections, the adult regimen typically involves an initial 15 mg/kg loading dose, followed by a 7.5 mg/kg maintenance dose administered every six hours (Q6H). The maximum adult dose is generally limited to 4 g per day. Alternative single-day or multi-day oral courses are specified for protozoal infections like trichomoniasis.

Administration Conditions and Adjustments

Oral tablets may generally be taken irrespective of meals, though specific forms like extended-release tablets must be taken without food. When administered intravenously, the solution must be given by slow drip infusion over a 30 to 60-minute period. A critical procedural rule requires that the intravenous solution not contact aluminum-containing equipment.

Official prescribing information dictates necessary dose modifications for certain populations: a 50% dosage reduction is required for patients diagnosed with severe hepatic impairment, and dose supplementation should be considered after hemodialysis. These instructions define a standardized protocol for its official use.

Recent Clinical Evidence

Research evidence / Overview of Studies for Entizol

Evidence for Systemic Use in Anaerobic Bacterial Infections

The research base for Metronidazole's use in systemic anaerobic infections is built upon foundational, often comparative, Randomized Controlled Trials (RCTs) conducted over several decades. These studies were applied in research contexts involving serious conditions, such as those that may follow surgery. Researchers focused on tracking outcomes related to infection clearance, including measuring the confirmation status of targeted anaerobic bacteria and observing patterns related to physical discomfort and systemic imbalance.

More recent systematic reviews and cohort studies have focused on optimizing how the medicine is given, exploring different dosing frequencies and their relationship to the drug concentration levels observed in the body. Research notes that some foundational evidence is older, and data are continually monitored to track any changes in resistance patterns in targeted anaerobes.

Evidence for Treating Protozoal and Localized Infections

Metronidazole has been extensively evaluated in RCTs and comparative trials for research exploring management strategies for protozoal diseases like Amebiasis and Trichomoniasis. Studies explored outcomes related to physical discomfort and the measured confirmation status of parasitological eradication of the organisms from the body. Findings describe measured patterns related to parasite clearance when different dosing regimens were used.

Similarly, the evidence base for Bacterial Vaginosis (BV) is supported by numerous RCTs and meta-analyses. For BV, one specific area of uncertainty highlighted by research is the high rate of recurrence. Studies report how the condition evolved in the observed populations, and findings indicate that the infection may return for a significant proportion of the women studied within the months following the initial resolution.

Research on Topical Formulations for Rosacea

The evidence for the topical use of Metronidazole in managing rosacea is primarily derived from Randomized Controlled Trials (RCTs) that are often vehicle-controlled (comparing the active product to the inactive cream or gel base). The main outcomes studied monitored changes in physical signs, such as the count of inflammatory skin lesions (papules and pustules), and assessments of skin redness intensity.

The certainty regarding the topical evidence is generally characterized as lower in the scientific literature. Findings were based on subjective or semi-objective measures, and limited follow-up durations were noted in the data.

Key Studies & References

  1. Topical metronidazole and azelaic acid for rosacea: a systematic review of randomized controlled trials

Frequently Asked Questions (FAQ)

Common questions about Entizol (FAQ)

Q: What is Entizol (Metronidazole) used for?

Metronidazole (Entizol) is an antibiotic medication used to treat a wide variety of bacterial infections, particularly those caused by anaerobic bacteria. It is also effective against certain parasitic infections like Trichomonas vaginalis (a sexually transmitted disease), Giardia lamblia, and Entamoeba histolytica.

It works by killing the bacteria and parasites that are causing the infection.

Q: How should I take Entizol (Metronidazole)?

Take Entizol exactly as prescribed by your healthcare provider. It is typically taken by mouth, with or without food, but taking it with food may help reduce stomach upset. Do not stop taking the medication early, even if your symptoms improve, as this can lead to the infection coming back and potentially becoming resistant to treatment. The dosage and duration of treatment depend on the type and severity of the infection being treated.

Q: What are the common side effects of Entizol?

The most common side effects of Entizol include:

  • Nausea, vomiting, or upset stomach
  • A metallic or bitter taste in your mouth
  • Diarrhea
  • Headache

These side effects are usually mild and may subside as your body adjusts to the medication. If side effects are persistent or severe, contact your healthcare provider.

Q: Can I drink alcohol while taking Entizol?

No, you should strictly avoid consuming alcohol (including products containing alcohol like certain cough syrups) while taking Entizol and for at least 3 days after stopping treatment. Combining Entizol with alcohol can cause a severe reaction known as a disulfiram-like reaction. Symptoms can include:

  • Severe nausea and vomiting
  • Flushing (redness of the face)
  • Rapid heart rate
  • Shortness of breath
  • Headache

Q: What should I do if I miss a dose of Entizol?

If you miss a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not double the dose to catch up. If you are unsure what to do, contact your pharmacist or healthcare provider for guidance.

Q: Does Entizol interact with other medications?

Yes, Entizol can interact with several medications. It is crucial to inform your healthcare provider about all the medications, supplements, and herbal products you are currently taking. Key interactions include:

  • Blood thinners (e.g., warfarin): Entizol can increase the effect of these medications, raising the risk of bleeding.
  • Lithium (used for bipolar disorder): Entizol can increase lithium levels, leading to potential toxicity.
  • Cimetidine (used to treat stomach ulcers/acid reflux): May increase the amount of Entizol in your body.
  • Phenytoin or phenobarbital (used to treat seizures): May decrease the amount of Entizol in your body.

Your doctor may need to adjust the dosages of your other medications while you are taking Entizol.

How should Entizol be stored and disposed of?

The storage and disposal of Entizol (Metronidazole) must strictly adhere to the conditions mandated by official regulatory labeling to ensure product quality and environmental safety.

Official Storage Requirements

Condition Requirement (Tablets and Injection)
Temperature Store tablets at Controlled Room Temperature (e.g., 15 C to 25 C / 59 F to 77 F); some products must be stored below 30 C (86 F).
Protection Must be protected from light and moisture. The solution for infusion must not be frozen.
Container Dispense and store in a well-closed, light-resistant container.
Child Safety Keep the medicine out of the sight and reach of children.

Official Disposal Rules

All unused or expired Entizol must be discarded in accordance with local regulations. To protect the environment, the product should not be disposed of via wastewater or household waste.

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

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