Conquer (Mebendazole)

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Conquer (Mebendazole)

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Conquer (Mebendazole)

Conquer is a recognized trade name for the medication containing Mebendazole, which is classified as an anthelmintic agent and is listed on the WHO Model List of Essential Medicines. It is a synthetic benzimidazole derivative primarily used to address parasitic worm infections, generally known as helminthiases. The medication is used for its effectiveness against a range of intestinal parasites.

Property Description
Active ingredient Mebendazole (INN)
Form Oral (Chewable tablet, suspension)
Pharmacological class Anthelmintic agent
General purpose Elimination of intestinal parasitic worms
Origin Synthetic compound

Core Composition and Pharmaceutical Type

The medication’s core therapeutic identity is the active ingredient, Mebendazole (INN), which is the sole parasiticidal substance in the formulation. Mebendazole is typically manufactured as an oral dosage form, commonly provided as a chewable tablet or an oral suspension. This dual availability is a key feature, making the medication accessible to patients, including children, who may have difficulty swallowing conventional tablets. As a synthetic compound, the drug is formulated to ensure its minimal absorption from the gastrointestinal tract, allowing it to concentrate its action directly at the site of infection.


Mechanism of Action: High-Level Principle

Mebendazole achieves its effect by disrupting the structure and energy supply of the parasitic organisms. The fundamental action involves the drug selectively binding to the beta-tubulin protein within the parasitic cells, which consequently blocks the formation of microtubules. This structural interference rapidly impairs the parasite’s function, inhibiting its uptake of essential nutrients, such as glucose. The loss of energy and subsequent structural breakdown leads to the immobilization and eventual death of the parasite, achieving the therapeutic goal of clearing the infection.

Regulatory References

  1. WHO Model List of Essential Medicines

What side effects are possible with Conquer (Mebendazole)?

Possible Side Effects and Safety Information

This section describes the adverse reactions and safety characteristics of Mebendazole as documented in official government regulatory information, classified by frequency and affected body systems.


Regulatory Classification of Adverse Reactions

The most frequently reported adverse effects are primarily related to the gastrointestinal system and are classified as common in regulatory documents. Less frequent, but more serious, reactions are also officially documented through post-marketing surveillance.

Frequency Classification System-Organ Class Examples of Reactions
Common Gastrointestinal Disorders Abdominal pain, diarrhoea, abdominal discomfort
Uncommon Gastrointestinal Disorders Flatulence
Rare/Not Known Skin and Subcutaneous Tissue Disorders Rash, severe skin reactions (e.g., Stevens-Johnson syndrome)
Rare/Not Known Blood and Lymphatic System Disorders Neutropenia, agranulocytosis

Serious Safety Considerations

Regulatory documentation lists serious adverse reactions that are rare but clinically significant, including hepatitis, agranulocytosis (a severe reduction in white blood cells), and convulsions. An official safety note exists regarding the reported association of severe skin reactions (SJS/TEN) with the concomitant use of Mebendazole and metronidazole.

Population and Exposure-Related Safety Notes

The safety and effectiveness are not established in children under two years of age. Furthermore, certain serious hematological effects, such as a decrease in white blood cell counts, are officially associated with higher doses and prolonged duration of treatment, distinguishing them from the risks of standard short-term courses. The medication is contraindicated in individuals with known hypersensitivity to Mebendazole or any component of the formulation.

Overdose and Emergency Response

The official regulatory profile for Conquer (Mebendazole) overdose addresses both acute manifestations and rare, severe outcomes linked to prolonged, high-dose exposure. Accidental overdosage is primarily documented to present with acute gastrointestinal complaints, including abdominal cramps, nausea, vomiting, and diarrhea. These signs are typically self-limiting and may occur within a few hours.


When to Seek Urgent Medical Help

Urgent medical attention is required for any suspected overdosage. The official instructions state that you must call your healthcare provider right away or get emergency medical help when overdosage is suspected, even if only minor gastrointestinal symptoms are present.


Officially Documented Manifestations and Management

Rare but serious systemic toxicities have been reported following the use of substantially higher doses over prolonged periods, affecting several physiological systems. These documented severe outcomes include effects on the hematopoietic system (e.g., agranulocytosis, neutropenia) and the hepatic system (e.g., hepatitis, reversible liver function disturbances).

No specific antidote is known for Mebendazole overdose. Treatment is defined as strictly symptomatic and supportive therapy, which may include procedural measures like administering activated charcoal for gastrointestinal decontamination. Furthermore, regulatory documentation highlights a specific risk in the pediatric population, noting that convulsions have been reported in infants under one year of age following accidental poisoning.

Therapeutic Uses of Conquer (Mebendazole)

The primary therapeutic goal of Conquer (Mebendazole) is the management of intestinal parasitic worm infections, providing specific support in clinical situations marked by gastrointestinal distress. This medication is an anthelmintic agent used to treat several types of worm infections, contributing to the resolution of associated symptoms.


Management of Symptoms and Conditions

This medication is applied in the management of infections caused by common worms that inhabit the digestive tract. It is generally applied when patients are diagnosed with infections from pinworm (enterobiasis), roundworm (ascariasis), whipworm (trichuriasis), and hookworm species, covering both single and mixed infestations. The medication contributes to easing a cluster of symptoms, including abdominal discomfort, nausea, and, specifically for pinworm, the intense anal itching and associated sleeplessness. By addressing the infestation, the medication helps reduce the overall symptom burden.

“The treatment contributes to functional stability by managing the discomfort that interferes with daily comfort during symptomatic periods.”

It is commonly used in scenarios requiring a wider, supportive approach, such as when treating children or all members of a household after a diagnosis, as this is relevant for managing recurrence and spread.


Quick Fact: Relief for Nocturnal Itching

Mebendazole may assist with managing the intense anal itching characteristic of pinworm infection, contributing to comfortable rest and general comfort during symptomatic periods.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Who Can and Cannot Use Conquer (Mebendazole)?

The eligibility profile for Mebendazole is strictly defined by regulatory documents regarding age, hypersensitivity, and specific health conditions.

Contraindications

Mebendazole is formally contraindicated and must not be used by two groups:

  • Individuals with a known hypersensitivity or allergy to mebendazole or any components of the drug formulation.
  • Children below the age of 1 year. This is a strict prohibition based on regulatory warnings regarding reports of convulsions in infants.

Age-Related Eligibility

Age Group Regulatory Status
Adults & Children ≥ 2 Years Established Use
Children 1 to 2 Years Restricted Use: Not extensively studied; use is conditional on potential benefit justifying the risk.
Geriatric Patients Not Fully Established: Specific safety and efficacy profiles are not fully established due to insufficient clinical data.

Condition-Specific Restrictions

Use is subject to caution or non-eligibility under certain conditions:

  • Pregnancy Status: Use is not recommended in pregnant women based on regulatory findings.
  • Hepatic Impairment: Use with caution is advised, as impaired liver function may lead to higher drug exposure.
  • Concomitant Drugs: The medicine must not be used concurrently with Metronidazole due to the associated risk of serious skin reactions.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Conquer (Mebendazole) describes specific interactions that modify the drug’s systemic exposure and mandates one critical avoidance restriction. The overall interaction structure is defined by both pharmacodynamic safety concerns and pharmacokinetic interference pathways.


Pharmacokinetic and Exposure Alterations

The clearance of Mebendazole makes its systemic exposure susceptible to alteration by co-administered medicines. Co-administration of Cimetidine, a medicine known to inhibit hepatic metabolism, may result in an increase in Mebendazole's plasma concentrations, a factor noted to be particularly relevant during prolonged treatment. Conversely, medicines classified as enzyme inducers, specifically the anticonvulsants Phenytoin and Fosphenytoin, and the antiretroviral Ritonavir, may lead to a decrease in Mebendazole's plasma concentrations and a reduction in overall systemic exposure. Separately, the official profile notes that dosing with a high-fat meal results in a modest increase in the drug's absorption and bioavailability.


Interaction-Related Restrictions and Cautions

Regulatory documents state that the co-administration of Mebendazole with Metronidazole should be avoided. This formal restriction is based on documented reports suggesting an association between the co-use of these two medicines and the development of severe dermatological reactions, including Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN). Furthermore, the official profile notes that impaired hepatic function is a condition that may lead to higher systemic plasma levels of Mebendazole due to impaired metabolism or biliary elimination.

Mechanism of Action

How Conquer (Mebendazole) Works

Mebendazole's mechanism leads to the cessation of function in parasitic helminths through a targeted, multi-step process that dismantles the parasite's fundamental systems. This process relies on a differential affinity between parasitic and mammalian beta-tubulin.

The drug's primary action is the high-affinity binding to the parasite's beta-tubulin, acting as an inhibitor to prevent the assembly of microtubules—the core structural components of the cell. This molecular action initiates a cascade that causes the degeneration of the helminth's tegument (intestinal lining), leading to a loss of structural integrity. The damage directly impairs the cell's transport machinery, blocking the uptake of the essential energy substrate, glucose. This inhibits the availability of the energy source, rapidly depleting the parasite's stored glycogen reserves and halting ATP production. This leads to a massive depletion of energy reserves, resulting in the worm's loss of motility and eventual cessation of metabolic function. The entire mechanism is constrained by a selective toxicity where Mebendazole binds significantly stronger to parasitic beta-tubulin than to human beta-tubulin.

Dosage and Administration Information

How to Use Conquer (Mebendazole)

The usage of Mebendazole is based on instructions that define the route of administration, the specific dosage, and the required treatment duration, which varies depending on the parasite being addressed. The medication is an oral anthelmintic and is typically available as a chewable tablet or a suspension.


Dosage and Administration Protocol

The standard dosage schedules are fixed regardless of patient weight and apply to both adults and pediatric patients two years of age and older. The administration process does not require patients to undergo special procedures such as fasting or purging and can be taken with or without food.

Indication Dosage Schedule Administration Specifics
Pinworm (Enterobiasis) 100 mg as a single dose. Tablets may be chewed, swallowed, or crushed and mixed with food.
Whipworm, Roundworm, Hookworm 100 mg taken twice daily (BID) for 3 consecutive days. The 3-day course defines the duration of treatment.

Treatment Duration and Flexibility

Treatment is typically structured as a short course. For pinworm, if the initial single dose does not result in a cure, a second 100 mg dose may be advised after an interval of three weeks. For other sensitive infections, the required use period is the continuous 3-day course. This standardized, short-term protocol governs the overall use of the medication in clinical practice.

Recent Clinical Evidence

Evidence for Use Against Roundworm (Ascariasis) and Pinworm (Enterobiasis)

Research exploring Mebendazole was studied for Roundworm and Pinworm infections using Randomized Controlled Trials (RCTs) and Systematic Reviews. These studies focused on Parasitological Cure Rate (CR) and Egg Reduction Rate (ERR). Research describes consistent patterns related to these outcomes, typically observed in short-term follow-up assessments. The evidence contributes to understanding symptom patterns, but the durability of sustained parasite clearance over extended intervals is not fully characterized.


Evidence for Use Against Hookworm and Whipworm (Trichuriasis)

Mebendazole was studied for Hookworm and Whipworm infections through RCTs that explored different regimens. Findings related to these two parasites were observed in some studies to be mixed. Trials reported considerable variability in Cure Rate measurements, particularly for the standard single-dose regimen. What remains uncertain is the need for further research concerning the optimal evaluation of treatment strategies for cases categorized as having heavy infection intensity. Scientific literature notes that the potential emergence of parasite resistance is a key uncertainty.


⏳ Research on Durability of Outcomes and Long-Term Follow-up

Efficacy assessments in most major trials were conducted in the short term, generally within two to three weeks after the final dose was administered. This means that long-term effects are not fully established. The available evidence provides insight into short-term physiological strain or stress monitored in studies, but data for the observation of clearance over time remain insufficient.


Evidence from Studies in Specific Patient Groups

The primary research was conducted in school-aged children and general adult populations, often stratified by initial infection intensity. However, the evidence quality varies across studies, and data for certain groups, particularly older adults or those with complex existing health conditions, remain insufficient.


Research Gaps and Uncertainties

The evidence quality varies across studies, particularly for Hookworm and Whipworm where findings were mixed. The potential for parasite resistance was observed in some studies as a key uncertainty. The data show patterns related to limited follow-up durations, and long-term effects are not fully established. Results apply only to the populations studied, and comparative evidence is lacking in some subgroups.

Frequently Asked Questions (FAQ)

Common questions about Conquer (Mebendazole) (FAQ)


Q: How long does it take for Conquer (Mebendazole) to start working?

A: Mebendazole's primary action begins upon administration by disrupting the parasite's systems. However, official clinical studies assess the full effectiveness, meaning the parasite clearance, approximately 18 to 22 days after the final dose of the treatment course has been completed.

Q: Do I need a prescription to get Conquer (Mebendazole)?

A: The regulatory status of mebendazole varies by geographic region. In the United States, the approved product is designated as 'Rx only,' meaning it requires a prescription. In some other countries, this medication may be available for purchase without a prescription for certain common uses.

Q: Is it normal to see changes after taking Conquer (Mebendazole)?

A: It is officially documented that common side effects can include transient gastrointestinal symptoms such as abdominal pain, discomfort, and diarrhea, particularly in cases where there is a massive parasitic infection. Official information notes these symptoms may occur as part of the body's response, based on clinical observations.

Q: What organs does Conquer (Mebendazole) mainly affect in the body?

A: Commonly reported effects are primarily related to the gastrointestinal system. However, rare, serious adverse effects documented in post-marketing experience may affect the liver (hepatitis) and the blood and lymphatic system (severe reduction in white blood cells). These effects are reported primarily in association with use at dosages substantially higher than recommended and/or for prolonged periods.

Q: Does Mebendazole interact with common pain relievers like ibuprofen?

A: Official regulatory documents list specific drug interactions, such as cimetidine, phenytoin, ritonavir, and metronidazole. Common pain relievers like ibuprofen are not specifically listed as known interactions in these official regulatory documents.

Q: Are there studies showing Mebendazole's use outside of intestinal infections?

A: Official regulatory approval is strictly limited to the treatment of specific intestinal parasitic infections, including pinworm, whipworm, roundworm, and hookworm. Other potential uses beyond approved indications are not included in the official labeling.

Q: What ingredients besides the active drug are in Conquer (Mebendazole) tablets?

A: The active ingredient in Conquer is mebendazole. The official labeling for the chewable tablet formulation also lists several inactive ingredients, or excipients, which may include anhydrous lactose, corn starch, magnesium stearate, and a sweetening agent like sodium saccharin.

Q: Why is Mebendazole sometimes packaged with strict hygiene instructions?

A: Official patient guidance emphasizes that strict personal and household cleanliness is important to prevent re-infection and transmission. This non-pharmacological step is necessary because the medication eliminates the adult worms but does not reliably eliminate all the parasitic eggs, which can lead to immediate re-infection.

Q: Is Conquer (Mebendazole) the same as other 'worm' medications?

A: Mebendazole is classified as a synthetic benzimidazole derivative and an anthelmintic agent. Other 'worm' medications may belong to this same pharmacological class, but they are distinct agents with varying characteristics, regulatory approvals for specific parasites, and documented safety profiles.

Q: What if I forget to take my Conquer (Mebendazole) dose?

A: Official patient information for multi-day courses often describes scenarios where a missed dose may be skipped if the next scheduled dose time is near, clarifying that the dose should not be doubled to make up for one that was forgotten.

Q: Are there any specific foods or drinks to avoid while using Mebendazole?

A: Official labeling states that the medication can be taken with or without food, and there are no specific foods or non-alcoholic drinks mandated to be avoided during the short-term course. Taking the drug with a fatty meal may modestly increase its absorption.

Q: Is Conquer (Mebendazole) used to treat infections in pets too?

A: Mebendazole is officially approved and labeled only for use in humans for the treatment of specific intestinal parasitic infections. Its use in animals is not addressed within the scope of human regulatory labeling.

Q: Can Conquer (Mebendazole) cause headaches or dizziness?

A: Yes, official post-marketing surveillance reports have listed both dizziness and headache as adverse reactions that have been associated with the use of mebendazole.

Q: How is Conquer (Mebendazole) different from albendazole?

A: Mebendazole and albendazole are both anthelmintic agents belonging to the same benzimidazole class. They are distinct medicines that differ in their established dosing schedules, the specific list of parasites they are approved to treat, and certain documented safety profiles.

Q: Is it possible to be allergic to Mebendazole?

A: Yes, a known hypersensitivity or allergy to mebendazole or any of its components is listed as a formal contraindication for its use in regulatory documents. Hypersensitivity reactions, including rash and angioedema, have been reported in post-marketing experience.

Q: Can Mebendazole cause dark urine?

A: In rare cases, dark urine has been reported as an adverse event in association with mebendazole use, according to official post-marketing surveillance reports.

Q: Is it safe to drink alcohol while taking Conquer (Mebendazole)?

A: The official label does not typically list alcohol as a direct interaction with mebendazole. However, caution is generally described as appropriate for medications metabolized by the liver, particularly for individuals with existing hepatic impairment.

Q: Do I need to change my diet while taking Mebendazole?

A: No specific change in diet is necessary. Official administration instructions state that the medication can be taken with or without food, and there are no requirements for special procedures such as fasting or purging.

Q: What should I know about the long-term use of Conquer (Mebendazole)?

A: Regulatory warnings indicate that rare, serious hematologic effects (like a severe drop in white blood cells) and abnormal liver function test results have been reported. These effects are officially associated with taking the medication for prolonged periods and/or at dosages substantially higher than those recommended for standard treatment.

Q: Is there a generic version of Conquer (Mebendazole)?

A: While the active drug is mebendazole, regulatory information on specific brand-name products in certain regions currently indicates that a lower-cost generic equivalent is not available on the market for those particular brand products.

Q: Does Mebendazole interact with heart or blood pressure medications?

A: Official drug interaction lists focus on specific medicines like cimetidine, phenytoin, ritonavir, and metronidazole. Medications used for heart conditions or blood pressure are not listed as known drug-drug interactions in these regulatory sources.

Q: What are the restrictions on driving or operating machinery after taking Mebendazole?

A: Due to the reported side effects of dizziness and drowsiness, patients are generally cautioned to observe their response to the drug before engaging in tasks that require complete mental alertness.

Q: Does Mebendazole cause hair loss?

A: Yes, alopecia (hair loss) is listed in official post-marketing reports as an adverse reaction associated with mebendazole use. This effect is primarily noted with higher doses and prolonged treatment periods.

Q: Does Mebendazole have a strong taste or smell?

A: The official inactive ingredients for the chewable tablet formulation often include sodium saccharin, which acts as a sweetener. This suggests the product is formulated to have an acceptable flavor for oral administration.

Q: What is the official classification of Mebendazole regarding dependency potential?

A: The drug is officially classified as an anthelmintic agent. Mebendazole is Not a Controlled Medication by regulatory bodies, indicating it has no official designation for abuse or dependency potential.

Q: Does Conquer (Mebendazole) affect how birth control works?

A: Official guidance generally indicates that mebendazole does not stop hormonal contraception from working, though severe diarrhea is noted as a possible side effect that could potentially affect the absorption of oral contraceptives.

Q: Do official documents mention Mebendazole causing unusual sleep patterns?

A: Official adverse reaction reports for mebendazole list drowsiness and, very rarely, convulsions under nervous system effects, but they do not specifically reference 'unusual sleep patterns' in the product information.

Q: What information is available about Mebendazole's effect on blood tests?

A: Official warnings advise that monitoring blood and liver function is advisable during prolonged therapy. Reported abnormalities include low blood cell counts (neutropenia) and abnormal liver function test results.

How should Conquer (Mebendazole) be stored and disposed of?

Storage and Disposal of Mebendazole (Conquer)


Official Storage Requirements

Mebendazole tablets and suspension must be stored at Controlled Room Temperature, defined as 20 C to 25 C (68 F to 77 F), with permitted excursions to 30 C. It is mandatory to keep the medicine from freezing and store it away from excess heat and moisture and protect it from light. The product must remain in its tightly closed original container. All mebendazole products must be kept out of the sight and reach of children.

Product Stability and Disposal

For specific chewable tablet and oral suspension formulations, regulatory labeling requires that unused portions be discarded three (3) months after the bottle is first opened. Unused or expired mebendazole must not be released into the environment; it should not be disposed of via wastewater or household waste. Disposal must follow approved methods in accordance with local, regional, and national regulations.

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

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