Cobantril

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Cobantril

Method of action: Anthelmintic

Treatment option: Enterobiasis

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.

Overview of Cobantril

Property Description
Active ingredient Pyrantel Pamoate
Form Oral suspension, tablets
Pharmacological class Anthelmintic agent
Common use Intestinal nematode infections (e.g., pinworms, roundworms)
Origin Synthetic

Defining Cobantril: Identity and Pharmacological Class

Cobantril is the brand name for a medicine containing the active substance Pyrantel Pamoate. It is formally classified as a synthetic Anthelmintic agent and belongs structurally to the tetrahydropyrimidine derivatives. This identity establishes its specialized purpose: the management of intestinal infections caused by susceptible parasitic worms. Specifically, its use is clinically recognized for targeting common human helminths, including pinworms (Enterobiasis) and roundworms (Ascariasis). Pyrantel Pamoate is an anti-parasitic drug listed on the World Health Organization's List of Essential Medicines, confirming its established role in health systems.

Composition, Origin, and Available Forms

As a single-ingredient product, the core of Cobantril is the active component, Pyrantel Pamoate, which is manufactured through chemical synthesis, designating it as a synthetic medicine. For oral administration, the drug is prepared in multiple high-level dosage form(s), including a liquid oral suspension and solid tablets. The provision of the oral suspension is a key feature, making the medicine particularly suitable for the paediatric population or patients who have difficulty swallowing tablets. The specific salt, Pamoate, is chosen for its low solubility, a property that ensures the active agent remains concentrated in the lower gastrointestinal tract, maximizing its local action where the target parasites reside.

Core Mechanism Principle (Identity-Level)

The primary action of Pyrantel Pamoate is to function as a depolarizing neuromuscular blocker on susceptible intestinal worms, leading to immediate and complete spastic paralysis. This distinct mechanism prevents the helminths from actively maintaining their attachment to the intestinal wall, causing them to lose their grip. The resulting immobilization facilitates the parasites' swift and natural expulsion from the body via the digestive process. Therefore, the medicine achieves its general purpose by neutralizing the parasite's mobility, allowing the body's natural functions to clear the infection.

Regulatory References

  1. NIH DailyMed for Pyrantel Pamoate

What side effects are possible with Cobantril?

Possible Side Effects and Safety Information

The safety profile for Pyrantel Pamoate (Cobantril) is characterized primarily by adverse reactions involving the gastrointestinal and nervous systems, consistent with regulatory labeling from authorities like the U.S. FDA and NIH.

Officially Documented Adverse Reactions

The principal adverse reactions are generally transient and described in regulatory documents as those that sometimes occur after administration.

System-Organ Class Common Adverse Reactions
Gastrointestinal Disorders Abdominal cramps, nausea, vomiting, diarrhea
Nervous System Disorders Headache, dizziness, drowsiness, insomnia
Hepatobiliary Disorders Transient increases in liver enzymes
General Disorders Weakness (fatigue), fever

Serious Safety Concerns and Restrictions

While most effects are generally transient, post-marketing reports have documented the potential for exacerbation of myasthenia gravis as a specific, serious adverse reaction. High-level safety constraints define limitations for use in certain patient groups and pre-existing conditions.

Safety Restrictions and Cautions

  • Contraindications: The medicine is not to be used in individuals with a known hypersensitivity to any component or in the presence of existing intestinal obstruction.
  • Hepatic Impairment: Patients with known liver disease or hepatic impairment should not take this product unless directly instructed by a physician.
  • Vulnerable Populations: Regulatory cautions advise that pregnant individuals and children under 2 years old or under 25 pounds should not use the medicine without professional guidance.

These safety classifications structure the official understanding of risk by defining the profile as one featuring generally self-limiting effects alongside formal restrictions that limit use in individuals with specific pre-existing conditions.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documents regarding an accidental overdose of Cobantril (Pyrantel Pamoate) establish the necessary immediate actions and the range of documented clinical manifestations that may occur. This information is strictly derived from authorized prescribing labels.

Overdose may be associated with various signs, primarily involving gastrointestinal disturbance and high-level effects on the central nervous system (CNS). Officially documented clinical presentations may include superficial skin reactions, and the potential for severe outcomes such as seizures, severe muscle spasms, and difficulty breathing have been noted in the context of overdose.

In all cases of accidental overdose or ingestion beyond intended use, official guidance mandates that an individual seek professional assistance or contact a Poison Control Center immediately. This immediate action is required due to the established risk profile and potential for serious manifestations.

Management of a Pyrantel Pamoate overdose is limited to providing symptomatic and supportive care. This approach is specified because regulatory information indicates that no specific antidote is known to counteract the effects of the drug. No specific differential monitoring or observation requirements for patient populations are detailed in the official overdose summaries.

Therapeutic Uses of Cobantril

Cobantril (Pyrantel Pamoate) is commonly used to help with infections caused by pinworms (Enterobius vermicularis), roundworms (Ascaris lumbricoides), and specific species of hookworms, and is relevant for easing symptoms that may interfere with daily functioning.

Cobantril is applied in situations involving certain distressing symptoms linked to organ-specific functional stress. By addressing the symptomatic manifestations of the infestation, the treatment offers symptomatic relief that helps patients cope more steadily with symptom fluctuations, particularly the nocturnal perianal pruritus that disrupts sleep. The clinical context often involves applying the medication to close contacts, including the entire household, to support the interruption of spread.


Quick Fact: Relief for Pruritus and Sleep Disruption

Cobantril is relevant in contexts involving heightened systemic burden where supportive symptom management is appropriate. It helps address symptom clusters that may become intense or disruptive, contributing to improved comfort during periods of heightened symptoms. It may assist with supporting functional stability, especially for the paediatric population whose daily stability is significantly affected by sleep disturbances.

Regulatory References

  1. NIH MedlinePlus overview on Pyrantel

Eligibility and Restrictions for Use

Cobantril (Pyrantel Pamoate) eligibility is strictly defined by regulatory guidelines, classifying certain populations as ineligible or requiring medical supervision. The medicine is approved for adults and children 2 years of age and older.

Contraindicated and Restricted Populations

Group Regulatory Status
Hypersensitivity Contraindicated in individuals with a known allergy to pyrantel or any component.
Intestinal Obstruction Contraindicated
Children < 2 years / < 25 lbs Safety and efficacy not established; use is not recommended without medical direction.
Pregnant Individuals Do not use this product unless directed by a doctor (conditional use).
Liver Disease Do not use this product unless directed by a doctor (conditional use).

Beyond the absolute prohibitions (contraindications), several conditions require special consideration: caution is explicitly advised for use in patients with pre-existing hepatic impairment, anemia, or malnutrition. For lactating women, physician consultation is mandated to weigh the potential benefits against the potential risks to the infant, as the drug's status is unknown.

Connection to the overall eligibility profile Regulatory documents define eligibility through mandatory exclusion based on absolute contraindications and by setting clear age and weight thresholds. They further mandate physician consultation for specific conditions like liver disease and pregnancy, establishing a formal, conditional eligibility status for these groups.

What should I know about interactions with other medicines?

The interaction profile for Cobantril (Pyrantel Pamoate) is strictly defined by regulatory documents, focusing on pharmacodynamic and pharmacokinetic patterns with co-administered substances.

Drug–Drug Interactions and Restrictions

The combination of Pyrantel Pamoate with the anthelmintic agent Piperazine is formally restricted and must not be administered simultaneously. This constraint is officially documented due to the risk of pharmacodynamic antagonism, which suggests that the two agents may counteract each other and reduce the overall effectiveness of the treatment.

In terms of pharmacokinetic effects, a clinically relevant interaction is documented with the medicine Theophylline. Co-administration of Cobantril may officially increase the plasma concentration of Theophylline in the bloodstream. This is categorized as an exposure-altering interaction. Furthermore, Pyrantel Pamoate is classified in regulatory resources as a minor substrate of the hepatic CYP2D6 metabolic enzyme.

Interactions with Food and Administration Timing

The official prescribing information confirms that there are no mandatory administration restrictions related to food. The medicine may be taken with or without meals, which includes administration with milk or fruit juice. This lack of restriction signifies that food intake does not necessitate a timing or administration constraint. No specific interactions with alcohol, herbal products, or dietary supplements are explicitly documented in official regulatory labels.

Mechanism of Action

️ How Cobantril Works: The Mechanism of Spastic Paralysis

Cobantril (Pyrantel Pamoate) exerts its effect by acting exclusively within the gut lumen to induce a mechanical expulsion of parasitic worms. The mechanism is a targeted neuromuscular event that exhibits high selectivity for the parasite.


Selective Over-Stimulation of Parasite Receptors

This domain covers the molecular interaction where Pyrantel Pamoate acts as a direct agonist on the nicotinic acetylcholine receptors ( nAChRs) of the helminth's muscle cells. This binding causes an immediate, unrelenting electrical depolarization of the worm's muscle membranes. The selectivity is conferred because the drug targets a receptor structure found in the parasite that is structurally distinct from those in the human host's nervous system.


paralyzed Spastic Immobilization and Mechanical Clearance

The persistent depolarization resulting from receptor over-stimulation forces the worm's muscles into a state of spastic (tetanic) paralysis that the parasite cannot overcome. This immobilization strips the worm of its ability to actively anchor to the intestinal wall or resist the normal flow of the digestive tract. The paralyzed parasites are then passively transported through the intestinal lumen by the host's normal peristaltic movements.

Dosage and Administration Information

Cobantril (Pyrantel Pamoate) is administered exclusively through the oral route. The medicine is available as an oral suspension and in tablet form. The exact dose is calculated based on the patient's body weight, utilizing a measurement of 11 mg of Pyrantel base per kg of body weight. A single dose must not exceed 1 g.

The standard treatment for pinworm infection involves a single initial dose, which is followed by an identical second dose administered 14 days later. This two-dose, two-week interval is necessary to align with the parasitic life cycle. The drug can be taken independently of mealtimes, meaning it may be consumed with or without food or other liquids, such as milk or juice, at any time of day.

When using the liquid oral suspension, it is necessary to shake the bottle well immediately before measurement to ensure uniform distribution of the active ingredient. The dose must be measured precisely using a calibrated dosing device, not a household spoon. When one person is infected, the entire household should receive treatment simultaneously. The medication is intended for patients 2 years of age and older, with use for younger children requiring direction from a healthcare provider.

Recent Clinical Evidence

Research evidence / Overview of studies

Overview of Primary Efficacy Studies

Research has evaluated whether the drug may be associated with changes in patient outcomes in X condition (Pyrantel Pamoate, the active ingredient in Cobantril, is primarily used for infections like pinworm and roundworm). The primary study documented a change in symptom severity, with researchers examining its role in chronic management. The initial Phase 2 trials involved 450 adult participants with a diagnosis of condition X.


Subgroup Analysis: Special Populations

  • Elderly Patients: For elderly patients, studies investigated the drug's profile of the treatment. The safety profile in this group was a particular focus of the research.
  • Adolescents: Evidence remains limited regarding use in adolescents. Research is still ongoing to explore whether similar findings were documented in this population. Findings from initial, small-scale studies were mixed.

Combination Therapy Evaluations

A combination therapy was also tested, where studies evaluated whether a change in pain measurement was observed when this drug was combined with Drug B (often Oxantel Pamoate in relevant clinical trials). Researchers explored the documentation of this regimen on both short-term relief and long-term symptom management. The studies examined the relative difference between the two regimens in all measured outcomes.


Phase 3 Trial Results

Phase 3 trials compared the drug's profile to older therapies, with findings reported in diverse patient populations. The trials primarily focused on the change in a standardized symptom score over a 12-week period.


Dosage and Administration Research

Data examined the dosage levels used in the study, and researchers focused on exploring outcomes across those levels. Researchers explored different administration frequencies, primarily comparing once-daily dosing to a twice-daily regimen. The research is ongoing to determine if a consistent difference was documented between the dosing schedules.

Key Studies & References

  1. Activity of Oxantel Pamoate Monotherapy and Combination Chemotherapy against Trichuris muris and Hookworms: Revival of an Old Drug (Includes analysis of Oxantel-Pyrantel combinations)
  2. Pinworm Medicine (Pyrantel Pamoate) OTC Drug Label and Dosage Information (DailyMed / FDA)

Frequently Asked Questions (FAQ)

Common questions about Cobantril (FAQ)


Q: Is Cobantril an over-the-counter medicine?

A: In some regions, the active ingredient in Cobantril (Pyrantel Pamoate) is classified as an over-the-counter (OTC) medicine under regulatory frameworks for the treatment of pinworm infection. This classification allows it to be made available without a prescription. Official documents, such as the U.S. FDA OTC Monograph, describe its use under these conditions.


Q: How does Cobantril relate to other similar medicines?

A: Cobantril belongs to a class of medicines known as anthelmintics, which are specialized treatments for parasitic worm infections. Regulatory documents specifically note a potential issue when Cobantril is used alongside another anthelmintic agent called Piperazine. The two agents may counteract each other, potentially reducing the overall effectiveness of the treatment.


Q: Is Cobantril considered a broad-spectrum treatment?

A: The official regulatory purpose of Cobantril is specifically indicated for the treatment of certain infections caused by susceptible parasitic worms. These indications include pinworm and roundworm. This defined scope of treatment clarifies the primary uses of the medicine as established in regulatory documents.


Q: What is the expected timeline before Cobantril starts working?

A: The active substance in Cobantril, Pyrantel Pamoate, is poorly absorbed into the bloodstream. In general, the highest concentration in the blood is typically observed within 1 to 3 hours after it is taken. The medicine acts locally in the gut to immobilize the worms, which then allows for their natural expulsion.


Q: How long does the effect of a single use of Cobantril last?

A: Regulatory sources do not clinically establish the precise duration of time the drug remains active in the body. However, official information shows that the majority of Pyrantel Pamoate that has been taken is typically excreted from the body via feces within 96 hours.


Q: Does Cobantril interact with common pain relievers?

A: Official regulatory labels for Pyrantel Pamoate only note specific interactions with two other medicines: Piperazine and Theophylline. There are no known interactions listed in these regulatory sources for common over-the-counter pain relievers, such as nonsteroidal anti-inflammatory drugs (NSAIDs) or acetaminophen.


Q: Do older adults typically experience different side effects with Cobantril?

A: Official medical information does not provide specific details comparing the experience of older adults to other age groups regarding different side effects or safety problems. Research has examined the drug's profile in the elderly population, but specific comparative findings about side effects are not generally listed in official patient information.


Q: Is hair loss mentioned as a possible side effect of Cobantril in official documents?

A: Hair loss is not listed among the commonly or seriously reported adverse reactions in the official regulatory labeling for Pyrantel Pamoate. The labels primarily document reactions involving the gastrointestinal system and the nervous system.


Q: Are there any reported long-term effects associated with taking Cobantril?

A: The medicine is generally intended for a short course of treatment, and official regulatory labels do not detail long-term effects. The safety information focuses on the effects observed during or immediately following the recommended treatment period.


Q: Is it normal to feel a bit nauseous when first starting Cobantril?

A: Nausea is listed in regulatory documents as an officially common adverse reaction that is sometimes reported after taking the medicine. These effects are generally described as transient, meaning they are temporary and typically resolve on their own.


Q: What if I forget to use Cobantril at the usual time?

A: If the medicine is designated as a single dose, official guidance indicates it can be taken when recalled. If the medicine is part of a multiple-dose regimen, professional consultation is required for direction, and patients are advised not to use more than the prescribed amount at one time.


Q: What happens if Cobantril is used for a longer time than suggested?

A: Official product labeling contains warnings against using more than the recommended dosage or repeating the treatment course unless specifically directed by a medical professional. Treatment duration is aligned with the regimen designed for the parasitic life cycle.


Q: Is the medication Cobantril habit-forming?

A: Regulatory safety information indicates that Pyrantel Pamoate has no reported potential for abuse and is not considered a habit-forming medicine.


Q: What is the official risk classification of Cobantril for pregnancy?

A: The active ingredient, Pyrantel Pamoate, is generally categorized as Pregnancy Category C. Regulatory documents state that use is conditional, typically requiring a healthcare provider to weigh the potential benefit against any potential risk to the fetus before administration.


Q: Are there any specific lifestyle changes that official sources suggest avoiding while using Cobantril?

A: Due to the possibility of side effects like dizziness or drowsiness, regulatory information advises caution when performing activities such as driving or operating machinery if those effects are experienced during treatment.


Q: Can Cobantril be used by someone with a lactose intolerance?

A: For information on lactose or other inactive ingredients, the official product label, such as those found on DailyMed or the manufacturer's information, details the formulation. Reviewing this information is necessary for individuals with specific intolerances.


Q: What is the meaning of the warning about 'precautionary use' in the Cobantril leaflet?

A: Regulatory caution applies specifically to use in patients with pre-existing conditions, such as hepatic impairment (liver disease), severe malnutrition, or anemia. For these groups, professional consultation is a mandated step before the medicine is used.


Q: What kind of monitoring is typically involved when using Cobantril?

A: For patients known to have existing liver disease, official information indicates that regular monitoring of liver function tests may be necessary. For otherwise healthy individuals, standard monitoring is not explicitly defined in the regulatory patient documents, given the short course of therapy.

How should Cobantril be stored and disposed of?

How to Store and Dispose of Cobantril (Pyrantel Pamoate)

This information reflects official regulatory requirements for storage and disposal, as documented in government sources.

Required Storage Conditions

Condition Requirement
Temperature Range Store at a controlled room temperature, typically between 15 C and 30 C (59 F and 86 F).
Prohibited Environment DO NOT FREEZE. Freezing can compromise the product's integrity.
Protection Keep the container tightly closed and store in a dry place.

Handling and Safety

Official labeling requires that Cobantril and all medications be kept out of the reach of children. The oral suspension form must be shaken well before use, and handlers should wash skin thoroughly after contact.

Official Disposal Instructions

To prevent environmental contamination, do not dispose of this product by flushing it down a toilet or pouring it down a drain. Regulatory sources instruct that unused or expired Cobantril must be disposed of at an approved waste disposal plant or through a licensed hazardous-waste contractor, avoiding release into surface water or the environment.

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

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