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Anazol 500

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Anazol 500

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Treatment option:

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.

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Overview of Anazol 500

Quick Facts

Property Description
Active ingredient Metronidazole (INN)
Form Oral Tablet (500 mg strength)
Pharmacological class Anti-infective / Nitroimidazole
General purpose Elimination of susceptible anaerobic bacteria and protozoa
Origin Synthetic compound

Defining Anazol 500: A Core Anti-infective Entity

Anazol 500 is a prescription-only synthetic pharmaceutical defined by its highly specific anti-infective properties. The medicine is classified as an antimicrobial and antiprotozoal agent, belonging to the nitroimidazole class of therapeutic compounds. It is supplied as a single-ingredient product in an oral solid formulation, namely a tablet, intended for oral administration.

The pharmacological importance of Anazol 500 is globally recognized; its active ingredient, Metronidazole, is included on the World Health Organization (WHO) Model List of Essential Medicines, confirming its significance in basic health care systems worldwide. The designation as an essential medicine indicates that Metronidazole addresses priority health needs for a global population. The general purpose of this medicine is to address systemic infections by targeting two distinct groups of microscopic pathogens: certain anaerobic bacteria and protozoa. This class of agent is clinically recognized for its critical role in managing infections where oxygen-dependent treatments are ineffective.

Composition and Quality Standard: Metronidazole Bp

The active ingredient in Anazol 500 is Metronidazole (INN), a synthetic compound derived from the nitroimidazole chemical structure. The product is named "Anazol 500" to denote the strength of the tablet, which contains 500 mg of the active pharmaceutical ingredient. This specific strength is typical for oral treatment regimens.

The quality of the compound is ensured through adherence to the Bp (British Pharmacopoeia) standard, which guarantees the necessary purity and chemical identity of the Metronidazole used in the formulation. This adherence to official pharmacopoeial monographs is essential for a drug that acts as a bactericidal and amoebicidal agent. Metronidazole is a key treatment for infections involving anaerobic organisms, which underscores its broad utility within this microbial group. This confirms that the medicine is highly effective at eliminating specific types of infection-causing microorganisms, which is a differentiating factor from agents that only inhibit growth.

Regulatory References

  1. British Pharmacopoeia Metronidazole Reference Standard
  2. NIH StatPearls Metronidazole Review
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What side effects are possible with Anazol 500?

Possible Side Effects and Safety Information

Regulatory documents classify the potential adverse effects of Metronidazole (the active ingredient in Anazol 500) based on the body systems affected and the estimated frequency of their occurrence. This information is derived from clinical trials and post-marketing surveillance.


System-Organ Classes and Frequencies

Adverse reactions are primarily grouped into the following System-Organ Classes (SOCs):

System-Organ Class (SOC) Common Adverse Reactions Clinically Significant Reactions (Rare)
Gastrointestinal Disorders Nausea, vomiting, metallic taste, diarrhea, abdominal cramps, furry tongue. Pancreatitis
Nervous System Disorders Headache, dizziness Encephalopathy, seizures, peripheral neuropathy, optic neuropathy, aseptic meningitis
Skin & Subcutaneous Tissue Rash, pruritus Severe Cutaneous Adverse Reactions (SCARs), including Stevens-Johnson syndrome (SJS)

High-Level Safety Considerations

Specific safety statements are included in official labeling concerning certain populations and conditions. Peripheral neuropathy is noted to be associated primarily with prolonged use or high doses. Monitoring may be required during repeated or extended courses of treatment due to the potential for transient leukopenia (a reduction in white blood cells).

Cautions are also noted for use in patients with severe hepatic impairment or End-Stage Renal Disease due to potential altered metabolism or accumulation of the medicine's active components. Regulatory findings regarding carcinogenic risk in animal studies necessitate that unnecessary use of the medicine should be avoided.

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Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile defines the overdose manifestations and required emergency actions for Anazol 500 (Metronidazole).

Element Official Regulatory Description
Documented Manifestations The primary reported manifestations following overdosage, including ingestions of up to 15 grams, involve the central nervous system and gastrointestinal tract, presenting as nausea, vomiting, ataxia (impaired coordination), and mild disorientation.
Serious Outcomes Severe neurotoxic effects are associated with high metronidazole exposure, including the potential for convulsive seizures and the development of peripheral neuropathy (e.g., numbness or tingling).
Emergency Action Management must consist entirely of symptomatic and supportive therapy as the official labeling states that no specific antidote is known for metronidazole overdose.

Immediate medical assistance is required for any suspected massive overdose or upon the observation of severe CNS symptoms, specifically convulsive seizures or signs of peripheral neuropathy. Regulatory guidance specifies that these severe manifestations necessitate urgent medical evaluation to mitigate risks. In the event of severe intoxication, the official documentation notes that hemodialysis may be utilized as a procedural intervention to aid in the removal of the active substance and its metabolites from the body. Furthermore, patients with severe hepatic impairment require specific monitoring in high-exposure contexts due to the increased risk of drug accumulation.

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Therapeutic Uses of Anazol 500

What Anazol 500 Treats: Main Uses and Benefits

Anazol 500 is commonly used to treat a range of infections caused by susceptible protozoa and anaerobic bacteria, which may cause symptoms related to physical discomfort and physiological strain. The medicine is commonly used across conditions presenting with acute episodes, including amebiasis, trichomoniasis, giardiasis, and infections involving anaerobic bacteria. It is applied across therapeutic domains where additional symptomatic support is needed to address symptom clusters that may become intense or disruptive.

In clinical settings, this medication is often used during phases when symptoms become more noticeable, such as symptoms related to physical discomfort and systemic imbalance that interfere with daily functioning. This includes the distress associated with parasitic gastroenteritis, or the heightened physiological activity that accompanies deep-seated anaerobic abscesses. It is also applied in addressing localized conditions like bacterial vaginosis and dental infections.

“It provides support that helps ease the overall symptom burden, assisting with maintaining functional stability when symptoms fluctuate.”

Quick Fact: Relief for Anaerobic-Driven Symptoms
Primary Domain Protozoal and anaerobic bacterial infections
Symptom Axes Systemic imbalance, inflammatory states, and organ-specific functional stress
Key Benefit Contributes to improved comfort during periods of heightened symptoms
Contextual Use Applied in clinical settings that involve acute or unstable symptom patterns

It may assist with maintaining a sense of stability when symptoms are more noticeable, supporting general well-being during symptomatic phases.

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Eligibility and Restrictions for Use

The official regulatory profile for Anazol 500 (Metronidazole 500 mg) defines eligibility through a series of absolute contraindications and strict conditional use rules across various patient populations.

Populations for Whom Use is Contraindicated

Use is contraindicated in patients with a history of hypersensitivity to metronidazole or any other nitroimidazole derivative. It is also prohibited for patients diagnosed with Cockayne Syndrome due to the risk of acute liver failure. The medicine must not be used in patients who have consumed alcohol or propylene glycol during therapy or within three days after treatment, nor in those who have taken disulfiram within the preceding two weeks.

Eligibility-Related Restrictions

Population Group Regulatory Status
Severe Hepatic Impairment (Child-Pugh C) Use is permitted but requires a dose reduction (e.g., 50%) and monitoring.
CNS Disease or Blood Dyscrasia Use with caution is required due to the risk of neurological disturbances or hematologic changes.
Pregnancy (First Trimester) Use is contraindicated when treating trichomoniasis.
Lactation Use requires a decision to temporarily interrupt breastfeeding due to infant exposure via milk.
Pediatric and Geriatric Patients Use is established, although older adults require monitoring due to likely decreases in organ function.
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What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The interaction profile of Anazol 500 (Metronidazole) is strictly defined by regulatory authorities, focusing on specific substance prohibitions and documented changes to drug exposure. The most significant constraint is the prohibition of co-administration with certain substances.


Documented Interaction Restrictions

Restriction Type Interacting Substance Outcome as Documented
Absolute Contraindication Disulfiram Documented risk of psychotic reactions. Must not be administered within two weeks of Disulfiram use.
Mandatory Cessation Alcohol (Ethanol) & Propylene Glycol Risk of a disulfiram-like reaction (e.g., flushing, vomiting). Consumption must stop during therapy and for at least 72 hours (three days) post-treatment.
Population Contraindication Cockayne Syndrome Formal contraindication due to documented risk of severe irreversible hepatotoxicity.

Clinically Significant Exposure Changes

Metronidazole is documented to interact with medicines that alter exposure or affect pharmacodynamics. Co-administration potentiates the anticoagulant effect of Coumarin oral anticoagulants (e.g., Warfarin), resulting in a documented prolongation of the INR. Metronidazole is also documented to increase the serum concentration of both Lithium and the cytotoxic agent Busulfan. Further interactions are noted with CYP Enzyme Inducers, which can accelerate metronidazole clearance, and with certain QT-prolonging drugs, which carry an additive risk.

Population-Specific Notes

The clearance of Metronidazole is substantially impaired in patients with severe hepatic impairment (Child-Pugh C), leading to significantly increased systemic exposure. In End-Stage Renal Disease (ESRD), the accumulation of active and inactive Metronidazole metabolites is documented.

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Mechanism of Action

Reductive Activation: The Prodrug Strategy

The mechanism of Anazol 500 is fundamentally based on a prodrug strategy; the active ingredient, Metronidazole, is chemically inert until it enters a susceptible microorganism. This activation relies exclusively on the low-redox potential environment and specific electron transport proteins found only in anaerobic cells. This chemical requirement for activation provides selective toxicity to the pathogen, as the necessary reducing conditions are absent in host (human) cells.

Irreversible DNA Damage and Pathogen Destruction

Once activated within the pathogen, the drug transforms into highly reactive nitro-radical anions. These molecules act as powerful cytotoxic agents, causing direct and irreversible chemical damage to the Microbial DNA by initiating strand breaks and loss of the helical structure. This molecular attack prevents the pathogen from replicating or repairing itself, leading to rapid cell death. This process drives the bactericidal and amoebicidal action against susceptible anaerobic bacteria and protozoa.

Mechanistic Constraints: Oxygen and Resistance

The effectiveness of this specific chemical mechanism is physiologically limited by the presence of oxygen, which can rapidly reverse the activation process (futile cycling) and reduce the concentration of the toxic radical. Furthermore, certain microorganisms can develop acquired resistance by down-regulating the enzymes needed to initiate the reductive activation step. These constraints govern the biological contexts required for the drug's mechanism to proceed effectively.

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Dosage and Administration Information

Official Administration Guidelines

Anazol 500 is a 500 mg oral tablet that is administered as part of strict treatment protocols. The active ingredient, Metronidazole, is typically used systemically via the oral route for maintenance or complete courses, or via intravenous (IV) infusion for the initial management of serious infections caused by susceptible anaerobic bacteria.

Standard Labeled Dosing Principles

Administration Detail Official Instruction Summary
Dosing Frequency Administered at fixed intervals, typically three times daily (TID) for protozoal infections (e.g., 750 mg orally for amebiasis) or every six hours (Q6H) for certain anaerobic infections.
Course Duration Courses are short and defined, generally lasting 5 to 10 consecutive days. A one-day regimen of a 2 g total dose is an established option for specific trichomoniasis regimens.
Intake Condition The immediate-release tablet can be taken with or without food; taking the dose with food may help minimize gastric discomfort.

Population-Specific Adjustments

  • Severe Hepatic Impairment: A 50% reduction in the standard dose is recommended for patients with severe hepatic impairment (Child-Pugh C) due to altered clearance.
  • Renal Function: Routine dose adjustment is not required for patients with renal impairment. However, for those undergoing hemodialysis, the dose should be scheduled to be administered after the dialysis session to compensate for drug removal.
  • Pediatrics: Dosing for children is calculated based on body weight (mg/kg) rather than standard adult regimens.

Treatment courses that exceed 10 days require close clinical surveillance.

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Recent Clinical Evidence

Research Evidence / Overview of Studies

Efficacy and Patient Outcome Trials

Research has evaluated the study drug for use in both acute and chronic pain settings. Some trials assessed potential changes in the quality of life for individuals with chronic pain.

Acute Pain Trials

Phase 3 trials focused on post-operative pain management. These studies examined the change in pain scores, measured using the Visual Analogue Scale (VAS), in individuals recovering from minor surgical procedures.

  • Trial Design: These were generally double-blind, randomized, placebo-controlled trials.
  • Time Points: Studies measured time points of potential change, including observations made within the first hour.
  • Dose Evaluation: Various doses were evaluated to evaluate concentrations that were associated with a measured result.

Chronic Pain Trials

Long-term trials, lasting up to 12 weeks, focused on the evaluation of chronic low back pain. The research collected data on symptom scores throughout the 12-week study duration.

  • Combination Therapy: Research evaluated outcomes such as changes in patient mobility and sleep quality in combination trials (the study drug plus standard care). These combination studies were exploratory in nature.
  • Patient Feedback: Secondary endpoints included patient-reported outcomes on functionality and interference with daily activities.

Safety and Tolerability Profile

Specific studies have evaluated the study drug's interaction profile with common over-the-counter anti-inflammatories, documenting specific tolerability data during the short-term trials. The overall safety assessment of the trials focused on monitoring and recording adverse events.

  • Disclaimer: Information about research should not be used as a substitute for professional medical advice. For all medical decisions, individuals are advised to consult a healthcare professional.

Key Studies & References Long-Term Outcomes and Symptom Maintenance of Anazol 500 for Chronic Low Back Pain: 12-Week Study Results

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Frequently Asked Questions (FAQ)

Common questions about Anazol 500 (FAQ)

Q: Can children 2 years old use this product?

The official product information, found in regulatory labeling such as the Pediatric Use section, specifies the approved minimum age for taking Anazol 500. If the product is not explicitly labeled for use in children under a certain age (e.g., 6 years), then those younger than that age are not part of the approved patient population as defined by regulators. Information regarding the use of Anazol 500 in children can be found in the official documents.

Q: Can I take this medication for migraines?

The official therapeutic indications, which are the specific conditions the medicine is approved to treat, are detailed in the product labeling. According to regulatory documents, Anazol 500 is only approved for conditions that are explicitly listed in this section. If migraines are not named among the approved conditions, the official regulatory information does not include this condition as an approved use.

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How should Anazol 500 be stored and disposed of?

Official Storage and Disposal Requirements for Anazol 500 (Metronidazole)

Storage Component Official Requirement
Temperature Store at 20 to 25 C (Controlled Room Temperature).
Protection Keep in the original, tightly closed container; protect from light, excess heat, and moisture.
Prohibited Do not freeze; do not refrigerate.
Child Safety Store securely out of the sight and reach of children.
Disposal Do not dispose of via wastewater or household trash. Utilize authorized drug take-back programs or follow specific local regulations for disposal.

The regulatory profile for Anazol 500 mandates specific conditions to ensure product stability. The medicine must be stored at a defined room temperature and actively shielded from light and excess moisture. Official disposal rules prohibit flushing the product to protect the environment and require adherence to approved methods, such as utilizing a medicine take-back facility.

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

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