Thelmox 100

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Thelmox 100

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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 Thelmox 100

Property Description
Active ingredient Mebendazole
Form Oral Tablet (often chewable)
Pharmacological class Anthelmintic Agent
Common use Control of Intestinal Worm Infections
Origin Synthetic Compound (Benzimidazole Derivative)

Defining Thelmox 100: Identity and Class Differentiation

Thelmox 100 is a prescription medication for oral use, defined by its single active ingredient, Mebendazole (INN). The drug is formally classified as an anthelmintic agent, a category of synthetic compounds specifically developed to manage infections caused by parasitic worms in the gastrointestinal tract. This compound belongs to the benzimidazole derivative family, a chemical group recognized for its potent activity against a wide range of intestinal helminths. Mebendazole's role in public health is indicated by its inclusion on the WHO Essential Medicines List by the World Health Organization.

The Form of Mebendazole: Composition and Key Feature

The formulation of Thelmox 100 is typically a tablet for oral administration, often designed to be chewable, which simplifies intake compared to conventional solid tablets. The product is a single-ingredient product, containing 100 mg of Mebendazole. This concentration of the active ingredient is consistent with its intended use for controlling helminthiasis. As an oral treatment, its composition is optimized to release Mebendazole directly into the digestive system to target the infection site, based on the compound's selective action.

General Therapeutic Purpose and Action Principle

The general therapeutic purpose of Thelmox 100 is the non-systemic control and clearance of intestinal worm infections. Its action involves Mebendazole selectively interfering with the parasite's vital energy and structural components. The principle of action is based on disrupting the formation of essential microtubules and simultaneously blocking the parasite's uptake of glucose. This targeted interference depletes the organism’s energy reserves, leading to its immobilization and subsequent natural elimination from the body, thereby addressing the root cause of the infestation.

Regulatory References

  1. WHO Essential Medicines List
  2. World Health Organization

What side effects are possible with Thelmox 100?

Possible Side Effects and Safety Information

The safety profile of Thelmox 100 (Mebendazole) is defined by officially documented adverse reactions classified by frequency and affected physiological system, as regulated by governmental health authorities. The most frequently reported adverse events are categorized as Common and typically involve the Gastrointestinal System, including abdominal pain, diarrhoea, flatulence, nausea, and vomiting. These effects may be more evident in the presence of a high parasitic burden.


Serious Adverse Reactions and Systemic Safety

Official regulatory documents also list Rare but serious adverse reactions, which fall under the Blood and Lymphatic System Disorders (such as neutropenia or agranulocytosis) and Hepatobiliary Disorders (hepatitis). Severe cutaneous reactions, including Stevens-Johnson syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), are also documented as rare occurrences. These systemic effects, particularly severe blood and liver disorders, have been reported in association with substantially higher dosages and prolonged exposure outside of standard regimens.


Regulatory Safety Considerations

The official labeling outlines specific safety constraints. Thelmox 100 is generally not recommended for use in children under 2 years due to reports of convulsions in this age group during post-marketing surveillance. The medicine is contraindicated in persons with known hypersensitivity to the drug or its excipients. Additionally, the label specifies that co-administration with metronidazole should be avoided due to an increased risk of severe skin reactions. Patients with pre-existing hepatic impairment may experience higher plasma levels of the drug, which is a key safety consideration.

Overdose and Emergency Response

Acute Overdose Manifestations and Emergency Action

The official regulatory profile for Mebendazole (Thelmox 100) overdose primarily documents transient gastrointestinal complaints following accidental acute overdosage. The expected manifestations are typically abdominal cramps, nausea, vomiting, and diarrhea. In the event of a suspected overdose, the required action is to seek immediate medical attention or contact a poison control center immediately, according to official guidance. Urgent medical intervention is necessary for any suspected severe toxicity, such as collapse, seizure, or difficulty breathing.


Severe Systemic Effects and Monitoring

Regulatory documents identify severe systemic toxicities associated with exposure at dosages substantially higher than recommended or for prolonged periods of time. These serious, documented outcomes involve the hematologic and hepatic systems, and include agranulocytosis, neutropenia, hepatitis, and reversible liver function disturbances. Due to the potential for these documented effects, monitoring of blood counts and liver function is mandated in high-exposure scenarios.


Management and Specific Considerations

Management of Mebendazole overdosage is focused on symptomatic and supportive therapy, as the regulatory profile explicitly states that no specific antidote is known. The official labeling also notes a population-specific risk: convulsions have been reported in infants below the age of 1 year following accidental poisoning, which requires specific awareness.

Therapeutic Uses of Thelmox 100

What Thelmox 100 Treats: Main Uses and Benefits

Thelmox 100 (Mebendazole) is commonly used in situations involving certain distressing symptoms of parasitic infections in the digestive tract, primarily the soil-transmitted helminths. Its use may assist with easing the overall symptom burden by helping to address the causative organisms.


Targeted Management of Intestinal Worms

The core therapeutic domain involves helping to address conditions characterized by periods of heightened symptoms associated with pinworm (Enterobiasis), roundworm (Ascariasis), whipworm (Trichuriasis), and hookworm (Necatoriasis/Ancylostomiasis). The medication is relevant in clinical settings defined by the presence of these helminths, including situations of mixed parasitic infections. This is relevant in clinical settings that involve acute or unstable symptom patterns, and is often applied when supportive symptom management is appropriate for household contacts.

The medication helps address symptom clusters that may become intense or disruptive. This includes addressing abdominal pain and cramping, as well as providing supportive relief from the intense, often nocturnal perianal itching associated with pinworm. Beyond immediate relief, Thelmox 100 may assist with managing symptoms related to secondary issues such as chronic fatigue and potential nutrient depletion. The therapy supports general well-being during symptomatic phases and may assist with nutritional comfort in conditions marked by increased physiological stress.


Quick Fact: Support for Perianal Itching

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

The eligibility for Thelmox 100 ( Mebendazole) is strictly governed by regulatory status, primarily concerning age and pre-existing conditions, which define who can and cannot use the medicine.


Official Eligibility Status

Classification Population Rule (Per Regulatory Labeling)
Use Established Adults and children 2 years of age and older.
Use Not Recommended Children under mathbf2 years; safety and effectiveness have not been established.
Conditional Use Breastfeeding women (use with caution, weighing benefits against risks).
Contraindicated Persons with known hypersensitivity to Mebendazole or its excipients.
Contraindicated Children below mathbf1 year of age (due to the risk of convulsions).
Contraindicated Pregnant women, particularly during the first trimester.

Condition-Specific Considerations

Patients with impaired hepatic function (liver disease) should be monitored closely, as this condition may lead to higher concentrations of the drug in the body. For geriatric patients, clinical data is insufficient to determine if response differs from younger adults. For Thelmox 100 to be used safely, patients must fall within the officially established age groups and be free of the absolute contraindications defined by government health authorities.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Thelmox 100 (Mebendazole) defines several interaction patterns that modify drug exposure or carry specific use restrictions.

Pharmacokinetic and Exposure-Altering Interactions

The co-administration of Thelmox 100 with certain medicines results in a documented change to the active ingredient's plasma concentrations:

  • Cimetidine: Concurrent treatment with cimetidine is documented to inhibit metabolism, leading to an increase in mebendazole plasma levels.
  • Carbamazepine and Hydantoins (e.g., Phenytoin): These anticonvulsant agents may induce hepatic metabolism, which can reduce mebendazole plasma levels and potentially decrease exposure.

Administration Restrictions

An explicit use restriction exists concerning a specific combination:

  • Metronidazole: The concomitant use of mebendazole and metronidazole should be avoided. This is due to postmarketing reports of a possible association with severe cutaneous adverse reactions, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN).

Food and Population-Specific Notes

  • Food: Administration with a high-fat meal is officially documented to cause a modest increase in mebendazole's bioavailability (systemic exposure).
  • Hepatic Impairment: Impaired hepatic function is noted as a condition that may lead to higher plasma levels of mebendazole due to altered clearance, a factor noted in regulatory documents.

Mechanism of Action

️ Molecular Targeting of Parasitic Cell Structure

The mechanism of action begins with the drug functioning as an inhibitor by selectively binding to the beta-tubulin subunit within the parasitic cells. This interaction is selective and halts the polymerization of tubulin, which is essential for assembling the parasite's internal microtubules. The resulting functional compromise of the cell's structural components leads to degenerative alterations in the parasite's intestinal tissue, which precedes metabolic failure.


️ Metabolic Blockade and Energy Depletion Cascade

The structural damage caused by microtubule loss directly leads to a critical physiological consequence: the parasite's compromised capacity for nutrient acquisition. The drug's mechanism effectively blocks the uptake of glucose, the parasite's primary energy source. This blockage rapidly depletes the organism's glycogen reserves, resulting in a severe reduction in ATP production. This energy deficit leads to the immobilization of the parasite, cessation of reproduction, and subsequent death.


️ Constraints of Mechanism Localization

A key characteristic of this mechanism is its localized peripheral action. The drug is poorly absorbed into the bloodstream, which ensures that its highest concentrations are achieved locally within the gastrointestinal lumen. This constraint ensures the mechanism operates effectively against parasites residing in the gut, but results in a limited functional scope against parasites that have migrated to extraintestinal tissues.

Dosage and Administration Information

How to Use Thelmox 100: Official Administration Guidelines

The administration of Thelmox 100 (Mebendazole 100 mg tablet) adheres to standardized, short-term usage patterns defined by regulatory authorities.

Administration Scope

Instruction Detail
Route of administration Oral use is the only specified route of administration
Dosing schedule Pinworm (Enterobiasis): 100 mg administered as a single dose. Whipworm, Roundworm, and Hookworm: 100 mg administered twice daily for 3 consecutive days
Timing in relation to meals Can be taken with or without food; no requirement for fasting or purging

Procedural and Age-Group Rules

Preparation and Intake Flexibility: The tablet may be chewed, swallowed whole, or crushed and mixed with food to facilitate oral intake. The score line present on the tablet is intended for ease of swallowing and does not facilitate the division of the dose.

Age-Group Administration: The 100 mg dosing schedule is consistent for adults and pediatric patients two years of age and older. Use is restricted in children below the age of 1 year, as safety data for this group has not been sufficiently established.

Course Duration and Repetition: The treatment involves a strictly defined short course (one day or three days). If required, treatment may be repeated with a second, full course after an interval of approximately three weeks.

Recent Clinical Evidence

Research evidence / Overview of studies

Research evaluated the investigational drug in studies exploring symptom relief. Clinical research has investigated whether the drug affects symptoms in participants with mild-to-moderate conditions. It is a treatment approach that has been studied in clinical research.


Key Findings from Clinical Trials

Outcome and Symptom Changes

A key meta-analysis evaluated the drug's role in pain scores and early changes in symptoms during the initial treatment phase. Trial findings indicated changes in severity over a 12-week period.

  • Primary Outcome: Research focused on standardized symptom severity scores. Studies have explored the relationship between the drug and measures of physical function, particularly in elderly participants.
  • Time to Change: Studies have reported that changes were observed within the first week.

Dose-Response Evaluation

A Phase II trial examined the effect of different dose levels. The study investigated three dosage cohorts to understand the differences in reported outcomes related to varying amounts of the components. Data was limited to patients who followed the criteria outlined in the study protocol.

Comparative Effectiveness

The outcomes over placebo were investigated in three separate Randomized Controlled Trials (RCTs). These studies evaluated differences in primary symptom scores between the investigational drug and the inactive comparator.


Safety Profile Research

Studies have collected data on the safety profile of the drug. Research documented the frequency and nature of adverse events reported by participants across all phases of the clinical program.

  • Common Events: The most frequently reported adverse events included mild gastrointestinal discomfort and temporary fatigue. These events were documented as specific types of adverse events in the trial data.
  • Long-term Data: Data from open-label extension studies continued to investigate the safety profile over a one-year period.

Key Studies & References

  1. Thelmox 100 Phase III Trial (T-001): A Randomized, Placebo-Controlled Study in Mild-to-Moderate Symptom Management

Frequently Asked Questions (FAQ)

Common questions about Thelmox 100 (FAQ)

Q: Are there any known long-term health concerns associated with prolonged use of Thelmox 100?

Official regulatory documents advise that for individuals taking Thelmox 100 for a prolonged duration, periodic assessment of certain organ system functions is suggested. This assessment typically includes checking the health of the blood and liver (hepatic function). This practice is a regulatory consideration during extended therapy.

Q: What are the signs of an allergic reaction to Thelmox 100?

According to the official product information, signs of an allergic reaction may include skin issues like a rash, hives (urticaria), and swelling of the face or throat (angioedema). More severe skin reactions, such as Stevens-Johnson syndrome and toxic epidermal necrolysis, have also been reported in postmarketing experience.

Q: Can elderly patients use Thelmox 100 without requiring special dosage adjustments?

The regulatory prescribing information indicates that data is limited regarding the effects of the medication specifically in geriatric patients. As a result, no specific information is available in official sources on the relationship of advanced age to the effects of the medication.

Q: Is it necessary to have routine blood work done while undergoing treatment with Thelmox 100?

Official guidance states that periodic assessment of organ system functions is advisable for individuals undergoing prolonged therapy with Thelmox 100. Regulatory documents indicate this monitoring is specifically advised for prolonged therapy, which implies it is generally not a requirement for short-term, standard courses.

Q: How common is it for patients to experience mild headache or dizziness while taking Thelmox 100?

Dizziness and headache are documented as adverse reactions reported in postmarketing experience with the drug. While these effects are noted in official regulatory materials, official summary documents typically do not provide specific frequency data for all post-marketing reported effects.

Q: Does Thelmox 100 carry a Black Box Warning issued by the FDA or similar regulatory body?

The official label lists serious warnings related to severe skin reactions and blood disorders that have been associated with the drug. However, the regulatory documentation does not indicate the presence of a Black Box Warning.

Q: Can Thelmox 100 be taken at the same time as common over-the-counter pain relievers like ibuprofen or aspirin?

Official drug interaction warnings for Thelmox 100 do not specifically list common non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or aspirin. The absence of these specific agents in the official warnings means there is no documented major interaction risk with these specific pain relievers in core regulatory texts.

Q: What information is available about Thelmox 100 interacting with common herbal supplements?

The official drug label states that other drugs, including herbal products and vitamins, may interact with the active ingredient in Thelmox 100. The inclusion of these products in the interaction section confirms awareness that an interaction potential exists.

Q: Does Thelmox 100 affect medications prescribed for high blood pressure or heart conditions?

A decrease in blood pressure (hypotension) has been reported as a rare postmarketing adverse reaction. This is noted in official regulatory safety documents. However, there is no documented drug-to-drug interaction with specific anti-hypertensive or cardiac medications listed in the label.

Q: Once Thelmox 100 is discontinued, approximately how long does the substance remain detectable in the body?

According to pharmacokinetic studies, the half-life of mebendazole is reported to be between 3 to 9 hours. The half-life is a measure of the time it takes for the concentration of the substance in the body to reduce by half.

Q: Has Thelmox 100 been studied in large-scale clinical trials involving diverse patient populations?

Official documentation of clinical and bioequivalence studies mentions including healthy male and non-pregnant, non-lactating female subjects. However, the explicit detail on the diversity or size of the broader efficacy population is limited in the summary documents.

Q: Does Thelmox 100 have any properties that are associated with dependency or addiction?

The drug status listing by the regulatory authority indicates that Thelmox 100 is not classified as a controlled drug. The classification indicates the medication is not associated with dependency or addiction potential under federal law.

Q: What are the general rules regarding driving or operating heavy machinery while taking Thelmox 100?

Official regulatory documents note that adverse reactions such as dizziness and drowsiness have been reported with Thelmox 100. If these effects occur, they may be a factor to consider when engaging in activities that require full mental alertness.

Q: Are there different versions or strengths of Thelmox other than Thelmox 100?

Yes, official regulatory documents indicate that the active ingredient, mebendazole, is available in other formulations besides the 100 mg tablet. These include other strengths, such as 200 mg and 500 mg tablets, as well as oral suspensions.

Q: Can Thelmox 100 interact with vitamin supplements?

The official drug interaction section of the label states that other drugs, including both vitamins and herbal products, may interact with mebendazole. The official label includes vitamins in the drug interaction section, indicating that a potential for interaction is noted.

Q: Are there any restrictions on donating blood while using Thelmox 100?

General guidance from blood donation authorities indicates that restrictions are typically related to the underlying parasitic infection being treated, rather than the medication itself. Donors are usually deferred until the infection is cleared and symptoms have fully resolved.

How should Thelmox 100 be stored and disposed of?

Official Storage and Disposal Instructions

The storage and disposal of Thelmox 100 (mebendazole) are governed by regulatory requirements to ensure product stability and safety.

Storage Conditions

The tablets must be stored at Controlled Room Temperature, specifically maintained between 20 and 25 C (68 and 77 F). The product must be kept in its original container and should be protected from light and moisture. It is a mandatory requirement to keep the medication out of the sight and reach of children.

Disposal Requirements

Unused or expired Thelmox 100 should be disposed of using an authorized drug take-back program. As an alternative when a take-back option is unavailable, the U.S. FDA recommends mixing the tablets with an undesirable substance (such as used coffee grounds or cat litter), placing the mixture in a sealed container, and discarding it in the household trash. The packaging must be marked to conceal personal information before disposal. The product is not recommended for flushing down the toilet.

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

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