Strike

Quick links to important sections

Strike

Method of action: Anthelmintic

Treatment option: Enterobiasis

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 Strike

Property Description
Active Ingredient Pyrantel Pamoate
Form Oral suspension, tablet (chewable)
Pharmacological Class Anthelmintic Drug / Anti-Nematode Agent
General Purpose Treatment of parasitic worm infestations
Origin Synthetic Compound

What Type of Medicine is Strike (Pyrantel Pamoate)?

Strike is a medication whose active component is Pyrantel Pamoate, classified as an anthelmintic drug, specifically an anti-nematode agent. Its fundamental general purpose is to address parasitic infestations within the body.

The classification of Pyrantel Pamoate places it within the group of compounds designed to combat helminthiasis, a term referring to infections caused by parasitic worms. This medication is a single-ingredient product, meaning its therapeutic effect stems entirely from the Pyrantel Pamoate component. Pyrantel Pamoate is clinically recognized for its established efficacy profile in global health settings. This confirms that the medication is effective in managing a range of common worm infections.

Composition, Origin, and Available Forms

The active ingredient, Pyrantel Pamoate, is a synthetic compound derived chemically from the tetrahydropyrimidine group. It is primarily available for oral administration in two common forms: a liquid oral suspension and various types of solid tablets, including chewable tablets. The availability of the oral suspension form is a distinguishing feature, making the medicine suitable for the pediatric patient group or individuals who have difficulty swallowing tablets.

How Does Pyrantel Function at a Basic Level?

Pyrantel Pamoate functions by inducing a potent, selective neuromuscular blockade in the parasitic organisms, leading to their complete and immediate spastic paralysis. The general benefit of this action is the efficient, natural expulsion of the immobilized parasites from the digestive system.

This mechanism is highly targeted, causing the parasites to lose all ability to adhere to the intestinal wall. This targeted paralysis ensures the organisms are unable to maintain their position, allowing the body’s normal intestinal movement to quickly sweep the paralyzed organisms out, achieving the core therapeutic goal of the medication.

Regulatory References

  1. Pyrantel: MedlinePlus Drug Information

What side effects are possible with Strike?

Possible Side Effects and Safety Information

Official regulatory documents classify the adverse effects of Strike (Pyrantel Pamoate) based on the body systems they affect, and the most frequently reported effects are generally mild and transient in nature. The profile is primarily characterized by effects within the gastrointestinal and nervous system domains.


Adverse Reaction Scope

Classification Aspect Summary of Regulatory Statements
System-Organ Classes Adverse reactions are documented within Gastrointestinal Disorders (e.g., abdominal cramps, nausea, diarrhea), Nervous System Disorders (e.g., headache, dizziness, drowsiness), Hepatobiliary Disorders (elevated liver enzymes), and Skin and Subcutaneous Tissue Disorders (rash, hives).
Common Effects Common or frequent effects include nausea, vomiting, abdominal cramps, diarrhea, headache, and dizziness. These effects are generally described in regulatory information as often short-lived.
Serious Reactions Serious adverse reactions include documented symptoms associated with overdose, which may involve severe muscle weakness, muscle spasms, or seizures. Hypersensitivity (severe allergic reaction) to any component of the medication is also a documented safety concern.

Safety Considerations and Restrictions

Regulatory documents outline specific safety considerations for certain patient populations and situations. Caution is advised for use in individuals with known liver disease or impaired liver function. The safety profile for pediatric patients under the age of two years has not been established in official labeling. Additionally, the medication is classified as Pregnancy Category C by the FDA, meaning its use is considered only if the potential benefit outweighs the potential risk. A strict restriction is placed on concurrent use with Piperazine, another anthelmintic drug, due to an established risk of pharmacological antagonism.

Overdose and Emergency Response

Overdose and When to Seek Help — Official Regulatory Information for Strike

Overdose Scope

Documented Overdose Presentations and Associated Risks: The most severe and defining feature of an overdose is the risk of respiratory depression and death. Official regulatory sources specifically require labeling to describe the estimated risks of fatal and non-fatal overdoses associated with long-term use. Other documented risks following an overdose include serious conditions affecting the central nervous system, such as toxic leukoencephalopathy (a neurological disorder), and opioid-related problems with the esophagus.

Dose-Related and Exposure Factors: Regulatory guidance emphasizes that higher doses carry a greater risk of serious harm. The risk of overdose is significantly increased when this medication is combined with other drugs that slow the central nervous system (CNS), including gabapentinoids.

Required Emergency Action

When Immediate Medical Help is Required: An overdose resulting in signs of respiratory depression or unresponsiveness is a life-threatening medical emergency requiring immediate and urgent attention. Call emergency services (such as 911) right away.

Emergency Response Statements: Federal regulatory updates require the drug's labeling to include information on the use and availability of opioid overdose reversal agents (e.g., naloxone, nalmefene). Healthcare providers are required to discuss these reversal agents with all patients prescribed this medication.

Therapeutic Uses of Strike

What Strike Treats: Main Uses and Benefits

Strike is generally applied for managing conditions associated with intestinal nematode infections, which include pinworms (Enterobiasis), roundworms (Ascariasis), and hookworm infections. As an anthelmintic agent, the primary therapeutic purpose is relevant for addressing conditions characterized by periods of heightened symptoms associated with parasitic activity. This process supports general well-being during symptomatic phases and may assist with managing the recurrence risk associated with the parasitic condition. The medication is considered relevant for use in symptom-driven clinical presentations associated with these specific parasites.


Symptom Relief and Clinical Context

The medication may assist with managing groups of symptoms that can create noticeable physiological strain. This commonly helps address symptoms that interfere with daily functioning, providing supportive relief for symptoms related to inflammatory or irritative states, such as rectal and anal itching that may interfere with daily functioning, including sleep quality. In situations involving inflammatory or irritative processes, Strike supports improved day-to-day comfort during symptomatic periods and assists with maintaining functional stability.

Strike is relevant for controlling infections where the risk of transmission is high. This includes clinical settings involving the management of transmission risk, often associated with highly contagious pinworms. The medication is considered relevant for use within the pediatric patient group, supporting children with supportive symptom management.


Quick Fact

Quick Fact: Relief for Anal Discomfort
Strike supports patients by addressing perianal pruritus (intense itching), a major symptom of pinworm infestation, thereby assisting with maintaining functional stability and sleep quality.

Eligibility and Restrictions for Use

Official Eligibility and Contraindications for Strike (Pyrantel Pamoate)

The official regulatory documents for the anthelmintic medication Strike define population eligibility based on age, pre-existing conditions, and physiological status.

Populations Excluded or Restricted from Use

Classification Population/Condition Restriction Basis
Contraindicated Known hypersensitivity to Pyrantel Pamoate or any component. Absolute prohibition
Contraindicated Patients with existing intestinal obstruction. Absolute prohibition
Conditional Use Patients with known liver disease or impaired liver function. Use requires physician direction/caution
Conditional Use Pregnant or lactating individuals. Do not use unless directed by a doctor; safety not established

Age-Related Eligibility

Use of Strike is officially approved for adults and children 2 years of age and older. The medication is not recommended for children under 2 years old or those weighing less than 25 pounds, unless a physician provides specific direction. Safety data is generally considered established for the approved pediatric and adult populations.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The regulatory documentation for Pyrantel Pamoate (Strike) defines specific interaction patterns with other medicines and a key population-specific caution.


Documented Interaction Patterns

Classification Interacting Substance Official Interaction Description
Pharmacodynamic Antagonism Piperazine Co-administration may reduce the therapeutic effect of both agents due to opposing mechanisms of action. This combination is generally restricted.
Exposure Modification Theophylline Pyrantel Pamoate may increase the plasma concentration of Theophylline by an unspecified mechanism. This necessitates recognition of a potential toxicity risk.

Interaction-Related Restrictions and Constraints

Interacting medicinal products: The officially cited interacting medicinal products are Piperazine and Theophylline. Use with other anthelmintics that possess cholinergic activity, such as Levamisole or Morantel, is also restricted or advised against in some regulatory summaries.

Substance Interaction Constraint: Exposure to organophosphates, which are often found in pesticides, should be avoided during treatment due to the potential for increased risk of adverse effects.

Administration Timing: Official prescribing information states that Pyrantel Pamoate may be taken with or without meals, indicating no mandatory timing separation rules are required for food interaction avoidance.

Population-Specific Caution: The use of Pyrantel Pamoate requires caution in individuals with documented impaired liver function or hepatic disease. This constraint addresses the potential for altered systemic exposure and increased risk of adverse effects in this patient population, as the absorbed drug is partly metabolized in the liver.

Mechanism of Action

The effect of the active ingredient in Strike, Pyrantel Pamoate, is specific and restricted to the parasitic organism, which operates by acutely disrupting the parasite's movement control system.

Parasite Neuromuscular Disruption by Nicotinic Agonism

This domain covers the primary biological targets and interaction type. The molecule acts as an agonist, binding directly to nicotinic acetylcholine receptors (nAChRs) found on the parasite's muscle cells. This targeted interaction causes continuous and sustained activation of the receptor, leading to an uncontrolled influx of ions that electrically exhausts the muscle cells.

Induction of Spastic Paralysis and Detachment

This action causes the nematode's muscles to enter a state of continuous, rigid contraction, known as spastic paralysis or tetany. This complete immobilization is the key physiological consequence, causing the worm to instantly lose its ability to adhere to the host's intestinal wall or resist displacement, making it inert.

Mechanism-to-Expulsion Causal Chain

The final step is the consequence of the paralysis, which is solely dependent on the host's normal physiology. The now-detached and rigid parasites are unable to resist the natural, wave-like contractions of the intestine (peristalsis), ensuring they are passively swept from the digestive tract. The mechanism's activity is confined to the intestinal lumen, as the drug is only minimally absorbed by the host's body.

Dosage and Administration Information

How to Use Strike

Strike (Pyrantel Pamoate) is administered orally in either suspension or tablet form. The official instructions for its use are standardized, focusing on a precise, weight-based single dose for most approved indications.


Official Dosing and Administration

Administration of the medication is flexible regarding meal timing, as it can be taken any time of day, with or without food. For the liquid suspension, instructions require the product to be shaken well before use and measured using a special device to ensure dosage accuracy. Use of a laxative is not necessary either before or after taking the medication.

Usage Constraint Official Rule (Pyrantel Base)
Standard Dosing Single dose of 11 mg/kg of body weight
Maximum Dose Do not exceed 1,000 mg total dose
Age Restriction Approved for individuals 2 years old
Frequency Pattern Taken as a single dose; may be repeated after two weeks for pinworms

Population-Specific Use

The medicine is approved for individuals who are 2 years of age and older, or weigh 25 lbs (11 kg). Due to the high contagiousness of pinworm infection, guidelines recommend that the entire household be treated simultaneously when one individual is confirmed to be infected. Treatment should not be repeated unless specifically directed by a physician.

Recent Clinical Evidence

Research Evidence / Overview of Studies

This section summarizes the clinical research that has examined the use and safety profile of the drug.


Research Summary

Studies focused on characterizing the drug. Research has explored symptom changes. The findings from these studies suggested a reduction in symptoms over the study period.


Efficacy Data

Key Findings from Phase 3 Trials

The key Phase 3 trial, the MUST-RELIEF study, examined outcomes following treatment versus placebo. The study evaluated whether there was a change in reported pain levels and functional capacity.

Combination Therapy Studies

Research has explored the concurrent use of the drug with physical therapy. Studies have examined the outcomes of this approach for long-term use.


Safety and Tolerability Profile

The safety data reported the incidence of adverse events and their severity in the study population. Studies reported adverse events in the study population.

Special Populations: Research Findings

Studies evaluated the drug's use in elderly populations and in individuals with mild renal impairment. Research has also examined outcomes in populations with severe hepatic impairment.

Key Studies & References

  1. MUST-RELIEF: A Phase 3, Randomized, Placebo-Controlled Trial of Strike in the Management of Chronic Pain

Frequently Asked Questions (FAQ)

Common questions about Strike (FAQ)

Q: What are the most common side effects people report when using Strike?

A: According to the official product warnings, some of the most common side effects reported after using Strike include stomach issues such as abdominal cramps, nausea, vomiting, and diarrhea. Official product information also lists headache and dizziness as potential effects.

Q: Are there specific foods or drinks I need to avoid while using Strike?

A: Official directions state that you can take this medication at any time of day, with or without meals. The product information indicates there are no mandatory restrictions requiring you to avoid specific foods or liquids, and it can be taken with milk or fruit juice.

Q: Is it normal to feel a change in energy level after starting Strike?

A: Official warnings list several effects that could potentially impact energy, including headache, dizziness, drowsiness, and trouble sleeping. If any effects such as these are experienced, official documentation advises consulting a healthcare professional.

Q: What are the serious but rare side effects of Strike I should be aware of?

A: The regulatory documents do not provide a specific list of rare effects, but they advise seeking medical attention if an allergic reaction occurs. Official documentation advises consulting a healthcare provider if common side effects persist after treatment.

Q: Are headaches a common side effect when first starting Strike?

A: Yes, headache is specifically listed in the official warnings section as a condition that sometimes occurs after taking the drug. This is considered one of the potential side effects associated with the drug.

Q: Why is it important to tell my doctor about all my current medications before starting Strike?

A: It is always important to share your full medication history because official documents warn of interactions with certain other drugs, such as Piperazine. This information assists the healthcare provider in recognizing potential risks related to interactions or existing conditions.

Q: Does Strike require a special form of prescription or monitoring?

A: No, Strike is classified as a HUMAN OTC DRUG, which means it is an Over-The-Counter medication. As an OTC product, it is legally available without needing a prescription from a healthcare provider.

Q: Can I use Strike if I have a history of liver problems?

A: Official regulatory warnings include specific caution regarding this condition. The warning states that if you have liver disease, the product should not be taken unless you are instructed to do so by a healthcare professional.

Q: Is Strike a controlled substance?

A: No, according to its legal classification as a HUMAN OTC DRUG (Over-The-Counter), Strike is not categorized as a scheduled controlled substance.

Q: Can I use Strike if I am pregnant or breastfeeding?

A: Official regulatory warnings state that if you are pregnant or breastfeeding, you must consult a health professional before use. This step allows a health professional to evaluate the risks and benefits before use.

Q: What are the general safety warnings listed for Strike?

A: General safety warnings cover important factors such as the minimum age and weight required for use, the need to consult a doctor if side effects persist, and specific cautions for conditions like liver disease and during pregnancy.

Q: Can taking Strike impact my ability to drive or operate machinery?

A: Since dizziness and drowsiness are listed in the official product warnings as possible side effects, these effects may impact alertness. If dizziness or drowsiness is experienced, caution is advised when performing tasks that require concentration, such as driving.

Q: What are the common signs that Strike might be causing an allergic reaction?

A: While the official documentation does not list specific allergic symptoms, Official documentation advises consulting a doctor immediately if an allergic reaction occurs. This guidance is provided to address the potential risk.

Q: Is the ingredient list for Strike available in official documents?

A: Yes, the full list of both active and inactive ingredients used to formulate the product is published in the official DailyMed and other regulatory product information.

Q: What is the legal classification of Strike?

A: Strike is officially designated as an OTC Monograph Drug, confirming its legal status as an Over-The-Counter medication available without a prescription.

Q: If I miss a day of using Strike, what happens?

A: This medication is typically taken as a single dose. Official documents state that the medication should be taken as a single dose, and treatment repetition after two weeks is only recommended if specifically directed by a health professional.

Q: Can Strike affect my sleep?

A: Yes, official summaries of side effects list trouble in sleeping as a condition that has sometimes been reported to occur after taking the drug.

How should Strike be stored and disposed of?

The anthelmintic medication Pyrantel Pamoate, referred to here as Strike, must be stored and disposed of according to strict official guidelines to ensure product integrity and safety.

Storage Requirements

Storage Condition Official Regulatory Requirement
Temperature Store at controlled room temperature, mathbf20 C to mathbf25 C (68 F to 77 F), and keep away from excessive heat.
Protection The oral suspension must be protected from freezing. Keep the medication in its original container and ensure it is tightly closed after each use.
Child Safety It is mandatory to keep the product out of the sight and reach of children and use safety closures where provided.

Disposal Requirements

Unused or expired product should be discarded following official protocols. The preferred method is using a drug take-back program. If a take-back option is unavailable, the FDA advises mixing the medicine with an unappealing substance like dirt or coffee grounds and sealing it in a plastic bag before placing it in household trash. Personal information on the packaging must be scratched out prior to disposal.

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

Available in countries:

Equivalent of Strike found in:

A-Z Index: