Vermisole

Quick links to important sections

Vermisole

Method of action: Anthelmintic

Treatment option:

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 Vermisole

Property Description
Active ingredient Levamisole (INN)
Form Tablet or Oral solution
Pharmacological class Anthelmintic and Immunomodulator
General purpose Eliminating parasitic worms and supporting immune function
Origin Synthetic

Defining Vermisole: Identity and Origin

Vermisole is the trade name for a medicinal product whose core identity is defined by its single active ingredient, Levamisole, which is the substance's International Nonproprietary Name (INN). This compound is a synthetic thiazole derivative belonging to the Imidazothiazole chemical class. Identifying Vermisole by its Levamisole content establishes it as a precise, chemically defined product, typically presented as a prescription medicine for human use. The clear, synthetic origin of the substance distinguishes its production process from that of naturally derived or herbal remedies.

What Type of Medicine is Levamisole?

Levamisole is primarily classified as an Anthelmintic, a high-level pharmacological category dedicated to eliminating parasitic worm infections in the body. Its function is not limited to this, however, as it possesses a distinct secondary property, acting as an Immunomodulator capable of helping to restore or enhance depressed functions of the host's immune system. Its mechanism involves acting as a cholinergic agonist, inducing paralysis in the target organisms. Levamisole's broad-spectrum anthelmintic activity is effective against various nematode species.

Composition and Available Forms

The composition of Vermisole focuses on the single-ingredient product Levamisole, which is combined with standard, non-active pharmaceutical excipients essential for product stability. The medicine is most commonly supplied for Oral administration in convenient dosage forms such as a chewable Tablet or an easy-to-swallow Oral solution. The availability of both forms allows healthcare providers to select the most appropriate method for administering the compound to the target patient group. These standardized forms ensure the accurate and consistent delivery of the Levamisole compound through the digestive system, allowing it to reach the site of action efficiently.

What side effects are possible with Vermisole?

Possible side effects and safety information

The official regulatory safety profile for Vermisole (Levamisole) is characterized by a distinction between generally common, transient effects and rare, serious adverse reactions.

Documented Adverse Reactions and Frequency

Adverse effects are categorized by frequency, with common reactions including Gastrointestinal Disorders such as Nausea, Vomiting, Diarrhea, and Abdominal pain. Nervous System Disorders like Headache and Dizziness are also frequently documented.

Less common reactions may include Fever, Chills, and Skin rash. The severity and type of adverse reaction are often related to the treatment context, with the single-dose anthelmintic regimen typically associated with milder symptoms.

Serious Safety Considerations

Official labeling documents the risk of rare, but severe and potentially life-threatening adverse reactions, primarily associated with prolonged or high-dose exposure. These serious events involve the Blood and Lymphatic System, including Agranulocytosis (a severe reduction in white blood cells) and Thrombocytopenia (a reduction in platelets). Serious Nervous System Disorders documented include Encephalopathy-like syndrome and Leukoencephalopathy.

Population-Specific Constraints

Certain constraints on the use of this medicine are defined purely by safety criteria. Vermisole is formally contraindicated in patients with a known hypersensitivity to the drug or its components, and in those with pre-existing blood disorders. Caution is advised for its use in individuals with hepatic or renal impairment, and it is generally avoided during the first trimester of pregnancy.

Furthermore, the official safety notes document that Vermisole has been reported to cause a Disulfiram-like reaction when used concurrently with alcohol.

Overdose and Emergency Response

Overdose and When to Seek Help

The official overdose profile for Vermisole primarily describes two patterns of toxicity based on the extent of exposure.

Acute Overdose Manifestations

Symptoms following a large, single accidental overdosage typically involve the gastrointestinal system and may include abdominal pain, nausea, vomiting, and diarrhea. While often transient, these symptoms warrant medical evaluation.

Chronic or High-Dose Toxicity

More severe systemic effects have been documented in individuals who received Vermisole for prolonged periods at dosages substantially higher than those recommended for standard use. These serious manifestations involve multiple physiological systems and include:

  • Hematological Disorders: Agranulocytosis and neutropenia (severe reductions in white blood cell counts).
  • Hepatic Disturbances: Reversible hepatic function disturbance and hepatitis.
  • Other Effects: Reversible alopecia (hair loss).

Required Emergency Actions

Immediate medical attention is necessary if an overdose is suspected or confirmed. Regulatory documents specify that treatment involves procedural interventions to limit absorption and provide supportive care, including gastric lavage and the administration of activated charcoal. Symptomatic treatment is also initiated based on the patient’s clinical presentation. Contacting emergency services or a poison control center immediately is required for any suspected overdose.

Therapeutic Uses of Vermisole

What Vermisole Treats: Main Uses and Benefits

The active compound is used for symptom management in contexts involving parasitic worms. The treatment is commonly used across conditions presenting with acute episodes.

Easing Disruption and Supporting Stability

Vermisole is applicable within clinical settings that involve acute or disruptive symptom patterns, and is often used in situations involving certain distressing symptoms. The medicine is commonly used to help with symptoms that interfere with daily functioning, particularly those linked to organ-specific functional stress.

“provides support that helps ease the overall symptom burden and contributes to improved comfort during periods of heightened symptoms.”

It is relevant in conditions characterized by periods of heightened symptoms, such as those presenting with episodic manifestations. By providing support that helps ease the overall symptom burden, it assists with maintaining functional stability when symptoms are more noticeable.


Quick Fact: Relief for Gastrointestinal Strain

The medicine is considered relevant when supportive symptom management is appropriate.

Regulatory References

  1. European Medicines Agency (EMA) overview of Levamisole

Eligibility and Restrictions for Use

Eligibility and Non-Eligibility for Vermisole (Levamisole)

Official regulatory documents strictly define the patient populations eligible to use Vermisole. Eligibility is based on age, physiological status, and pre-existing medical conditions.


Absolute Contraindications

Use of Vermisole is prohibited (contraindicated) for patients with a known hypersensitivity or allergy to Levamisole or its components, as stated in the product information. It is also contraindicated for patients with pre-existing blood disorders, rheumatoid arthritis, or severe kidney disease due to the risk of serious adverse effects.


Restricted Use and Special Populations

Population Group Eligibility Status Regulatory Requirement
Pregnancy Not Recommended Assigned Pregnancy Category C by the FDA; use only if the benefit justifies the risk.
Breastfeeding Not Recommended WHO advises against breastfeeding during maternal therapy due to a lack of data on excretion into milk.
Pediatric Patients Allowed/Established Approved for specific indications (e.g., parasitic infections), often with weight-based dosing guidelines in international labels.
Organ Impairment Use with Caution Caution required for patients with a history of liver or kidney diseases (excluding severe stages).

Adult and older adult populations are generally considered eligible, though caution is required for any patient with an existing infection.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Vermisole (Levamisole) has officially documented interaction patterns that enforce mandatory restrictions and monitoring requirements when co-administered with certain medicinal products and substances, as defined in regulatory labels.


Interaction Scope

Category Official Regulatory Documentation Summary
Medicinal product categories with documented interactions Organophosphorus compounds; Nicotine-like anthelmintics; Coumarin-type anticoagulants; Agents affecting haemopoiesis.
Specific interacting medicines (if explicitly listed) Warfarin; Phenytoin; Alcohol (Ethanol).
Mechanistic basis of interactions Pharmacodynamic reinforcement (additive cholinergic effects); Pharmacokinetic interaction resulting in increased plasma levels or prolongation of blood effects of the co-administered drug; Pharmacodynamic inhibition (Disulfiram-like reaction with alcohol).

Interaction Classifications (High-Level)

Classification Official Regulatory Documentation Summary
Interaction severity classification Prohibited/Contraindicated Combinations (Organophosphorus, Alcohol); Clinically Significant Interactions Requiring Monitoring (Warfarin, Phenytoin).
Timing-based interaction rules Co-administration with Organophosphorus compounds must be avoided for a period of 14 days before or after Vermisole treatment. Alcohol consumption is prohibited for at least 24 hours following Vermisole intake.

Resulting Interaction Structure

Official documents indicate that Vermisole can increase the exposure or effects of certain drugs. This includes Phenytoin and Warfarin, where co-administration is associated with increased plasma levels or a prolongation of prothrombin time (INR), requiring professional monitoring of the co-administered agent. Furthermore, regulatory labels prohibit the concurrent use of Organophosphorus compounds and Alcohol (Ethanol) due to the risk of enhanced toxicity and a severe Disulfiram-like systemic reaction, respectively. The profile also notes that use should be avoided in cases of advanced hepatic or kidney disease.

Mechanism of Action

Vermisole acts as a nicotinic acetylcholine receptor ( nAChR) agonist on the muscle cells of susceptible parasitic organisms. This interaction selectively targets and binds to the L-subtype of the nAChR at the parasite's neuromuscular junction. The resultant binding causes continuous stimulation and depolarization of the muscle membrane. This persistent depolarization leads to an uncontrolled influx of sodium ions and subsequent spastic paralysis of the parasite's musculature. The systemic physiological consequence is the immobilization of the parasitic organism, preventing it from maintaining its attachment or position within the host's gastrointestinal tract. Vermisole also exhibits immunomodulatory activity in the host by stimulating the functions of T-lymphocytes and macrophages, which appears to restore depressed immune responses.

Dosage and Administration Information

How to Use Vermisole

Vermisole is administered orally and is available in forms such as a tablet or oral solution, facilitating its use as directed by healthcare professionals. The usage of this medicine is structured around two distinct approaches, reflecting its applications as a short-course anthelmintic agent and a historically approved long-term cyclic immunomodulator.


Official Usage Principles and Dosing

Usage Context Administration Pattern Dosing Details Frequency and Duration
Anthelmintic Use Taken orally, typically with or without food. A single dose of 2.5 mg/kg of body weight, or a standard fixed dose of up to 150 mg. Single course is standard; a second dose may be given 7 days after the first in severe cases.
Adjuvant Therapy (Historical) Taken orally as part of a combination therapy with fluorouracil. 50 mg of Levamisole per dose. Administered every 8 hours for 3 consecutive days per cycle, repeated at 2-week intervals for 1 year.

Administration Context and Adjustments

Official instructions confirm the oral administration route for all approved forms. For the long-term, cyclic regimen (historically approved for colon cancer), administration was strictly conditional on its use in combination with another specified agent and initiation within a set timeframe following surgery.

Dosing rules for specific populations require caution. Dose adjustments or close monitoring may be necessary for patients with pre-existing hepatic or renal impairment. For the anthelmintic regimen, the dose for pediatric patients is determined by weight, following the same mg/kg calculation as adults. Should a dose be missed, the procedure is to skip the missed dose and continue with the regular schedule, without doubling to compensate. This structured approach ensures the medicine is used according to specific, documented protocols.

Recent Clinical Evidence

Research Evidence: Overview of Studies for Vermisole

Evidence for Use in Parasitic Worm Infections (Anthelmintic Role)

Vermisole was studied for its use in conditions involving parasitic worm infections, such as those caused by nematode species. The core research base consists of short-term randomized controlled trials (RCTs) and various observational field studies, which primarily included both adults and children. Studies monitored outcomes related to the overall Parasite Clearance Rate and measured the Fecal Egg Count Reduction to monitor changes in the parasite burden in the observed populations.

Research describes patterns of study outcomes related to parasite clearance measurements within the short-term evaluation period. However, follow-up durations were limited for long-term monitoring. Post-marketing and observational settings have shown patterns related to the development of drug resistance in certain parasite strains in some regions.

Evidence for Use in Immune-Mediated Conditions

Research has explored Vermisole's secondary function as an immunomodulator, focusing primarily on its role in certain immune-mediated conditions characterized by fluctuating or episodic manifestations. A significant portion of this research was evaluated in children diagnosed with Steroid-Sensitive Nephrotic Syndrome (SSNS). The studies employed RCTs to explore the compound’s association with outcomes in relapsing conditions, monitoring the relapse frequency and patterns of outcome measures related to stability.

Findings describe patterns observed in these studies where relapse frequency was one of the outcomes monitored in patient cohorts. The evidence level for this use is considered moderate for SSNS, but long-term effects are not fully established beyond two to three years. The results apply only to the narrow patient populations studied.

Gaps in Research and Areas of Uncertainty

Key limitations include modest sample sizes in many immunomodulatory studies and a lack of comprehensive long-term data across both major indications. The findings for its immunomodulatory role were mixed across different disease states, indicating that the precise clinical conditions where it may be applicable are still being explored. Comparative evidence against other standards of care is also lacking in several areas.

Key Studies & References

  1. PRAC starts safety review of levamisole, a medicine used to treat parasitic worm infections (EMA)

Frequently Asked Questions (FAQ)

Common questions about Vermisole (FAQ)


Q: Is Vermisole the same type of medicine as [Common Similar Drug Name]?

A: Official regulatory information identifies Vermisole's active ingredient, Levamisole, as belonging to two distinct pharmacological classes: an anthelmintic (for parasitic worms) and an immunomodulator (for immune support). This classification, along with its unique mechanism of action, determines how it is grouped compared to other medicines.


Q: Does Vermisole interact with common pain relievers like ibuprofen or aspirin?

A: Official product information notes potential interactions with Coumarin-type anticoagulants, such as Warfarin, and medicines that affect blood cell production (haemopoiesis). While common pain relievers are not individually named, regulatory labels suggest caution when combining Vermisole with other drugs that affect blood clotting or blood cell count.


Q: Can Vermisole cause trouble sleeping or drowsiness?

A: Regulatory documents list central nervous system effects, such as dizziness, as common side effects. While trouble sleeping (insomnia) is not explicitly listed as frequently occurring, drowsiness (somnolence) and fatigue have been noted in post-marketing reports as possible side effects.


Q: What is the research evidence supporting the use of Vermisole?

A: Studies and official information indicate that the medicine has supporting research from randomized controlled trials (RCTs) for both its role in parasitic infections and its use in certain immune-mediated conditions. For example, research has explored its association with outcomes in Steroid-Sensitive Nephrotic Syndrome (SSNS), though long-term data for its immunomodulatory use is considered limited.


Q: Can Vermisole affect my ability to drive or operate machinery?

A: Due to the potential for nervous system side effects, such as dizziness, official regulatory labels suggest caution. Regulatory guidance suggests that if a person experiences these kinds of effects, caution is warranted when performing tasks that require concentration and alertness, such as driving or operating heavy equipment.


Q: Is there a generic version of Vermisole available?

A: Vermisole is the brand name for the active ingredient Levamisole. Active ingredients with an International Nonproprietary Name (INN), such as Levamisole, may be available as generic equivalents in various markets, subject to regional regulatory approvals and product availability.


Q: Do many people experience nausea or stomach upset with Vermisole?

A: Yes, regulatory documents list gastrointestinal issues like nausea, vomiting, diarrhea, and abdominal pain as commonly reported adverse effects. These are considered frequent reactions to the medicine.


Q: Is it normal to feel a bit lightheaded when starting Vermisole?

A: Dizziness, which can be perceived as lightheadedness, is officially documented as a common side effect of Vermisole. Like many common side effects, this is generally more likely to occur during the initial phase of treatment.


Q: Are there any known drug classes that seriously interact with Vermisole?

A: Yes, official labels advise against the concurrent use of Organophosphorus compounds due to a risk of enhanced toxicity. Likewise, the consumption of alcohol (ethanol) is advised against due to the potential for a severe, systemic reaction. Other classes, such as Coumarin-type anticoagulants, require close monitoring.


Q: Does Vermisole need to be taken with food, or can it be taken on an empty stomach?

A: For its short-course anthelmintic use, official instructions state that the medicine can typically be taken either with or without food.


Q: Are headaches a common initial reaction to Vermisole?

A: Headache is listed in official product information as a frequently documented adverse effect. Like other common side effects, this is more likely to occur at the beginning of the treatment course.


Q: Can people with a history of heart problems use Vermisole?

A: A history of heart problems is not specifically listed as an absolute contraindication in regulatory documents. However, caution is noted in regulatory information for individuals with pre-existing health conditions, and suitability for use is determined by a healthcare provider.


Q: What's the difference between Vermisole and its active ingredient?

A: Vermisole is the brand or trade name given to the final product. The active ingredient, which is the substance responsible for the medicine's effect, is Levamisole, its International Nonproprietary Name (INN).


Q: What if I experience unusual fatigue while taking Vermisole?

A: Unusual fatigue has been reported as a general systemic adverse effect. Official warnings indicate that fatigue can potentially be a sign of a rare but serious blood disorder, such as agranulocytosis (a severe drop in white blood cells), a condition that medical professionals need to assess.


Q: Does the effectiveness of Vermisole decrease over time?

A: Post-marketing and observational data have noted patterns suggesting the development of drug resistance in certain parasitic worm strains in some geographic regions. This emergence of resistance can lead to a reduction in the medicine's effectiveness over time.


Q: Are there food interactions to watch out for with Vermisole?

A: While the medicine can generally be taken with or without food, the most important precaution regarding consumption is the strict advisory against alcohol (ethanol), which is known to cause a severe systemic reaction when combined with Vermisole.


Q: Why do some people feel worse before feeling better on Vermisole?

A: The medicine’s mechanism involves the forceful, spastic paralysis of target parasitic organisms. This, combined with common side effects like nausea and abdominal pain, may cause temporary discomfort or feeling unwell as the body processes the medication and eliminates the target organisms.


Q: Are there any recent studies or clinical trials about Vermisole I should know about?

A: Official reports indicate that there is a lack of comprehensive comparative evidence against current standards of care in several areas. Research, particularly on its immunomodulatory effects, continues to be explored in newer clinical trials.


Q: How is Vermisole different from over-the-counter remedies for similar conditions?

A: Vermisole is a prescription medicine containing the active ingredient Levamisole. It is classified as an anthelmintic and an immunomodulator, distinguishing it from non-prescription, over-the-counter products.


Q: What is the general success rate reported in Vermisole studies?

A: Clinical studies track outcomes such as Parasite Clearance Rate for parasitic infections and reductions in Relapse Frequency for conditions like Steroid-Sensitive Nephrotic Syndrome (SSNS). For SSNS, studies have noted an association with a higher proportion of children without relapses at specific follow-up times compared to control groups.


Q: How should I store Vermisole medication?

A: Official storage instructions require that Vermisole be kept at a controlled room temperature, typically between 20 C to 25 C. The medicine must be protected from freezing, excessive heat, moisture, and light, and should always be kept tightly closed in its original container.


Q: Is Vermisole known to cause weight gain or loss?

A: Regulatory information indicates that adverse effects have included decreased or persistent loss of appetite. While weight change itself is not listed as a primary side effect, a change in appetite can be associated with weight loss.


Q: Can I take Vermisole if I am currently taking herbal supplements?

A: Since Vermisole is known to interact with various classes of medications, official guidance recommends seeking the assessment of a healthcare provider before using any other product, including herbal or dietary supplements, as they may alter the effects of Vermisole.


Q: Is Vermisole commonly prescribed to young adults?

A: Official documents confirm the established use of Vermisole across different age groups, including weight-based dosing for pediatric patients in some indications. This indicates that its use spans a wide patient population, which includes young adults, based on the specific condition being treated.


Q: Is Vermisole often used in combination therapy?

A: Yes, its historical use as adjuvant therapy in certain conditions was strictly administered as part of a combination therapy with another specified chemotherapy agent.


Q: Does Vermisole affect blood tests or lab results?

A: Yes. Official warnings are in place because Vermisole is associated with serious blood disorders, such as agranulocytosis (a decrease in white blood cells) and thrombocytopenia (a decrease in platelets). Blood tests are necessary to monitor for these effects.

How should Vermisole be stored and disposed of?

How to Store and Dispose of Vermisole?

The storage and disposal of Vermisole (Levamisole) must strictly follow regulatory standards to maintain product quality and ensure safety.


Official Storage Requirements

Item Requirement
Temperature Store at controlled room temperature, typically 20 C to 25 C.
Protection Keep from freezing and protect from excessive heat, light, and moisture.
Container Store in a well-closed container and ensure it is tightly closed.
Child Safety Keep out of the reach of children.

Official Disposal Instructions

Do not flush unused Vermisole down the toilet or pour down a drain unless directed by the label. Unused medicine should be disposed of through an authorized drug take-back program or by following established regulatory guidelines for household trash disposal (e.g., mixing with an undesirable substance and sealing it before discarding).

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

Available in countries:

Equivalent of Vermisole found in:

A-Z Index: