Combat

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Combat

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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 Combat

Property Description
Active ingredient Naftalofos (INN)
Form Boluses (solid oral), Powder/Granules
Pharmacological class Anthelmintic
Common use Antiparasitic (Veterinary)
Origin Synthetic (Organophosphorus compound)

What is Naftalofos, the Active Ingredient in Combat?

Combat is a specialized veterinary medication defined by its active pharmaceutical ingredient, Naftalofos (INN), a potent synthetic substance. This compound is chemically classified as an organophosphorus compound and an isoquinolin derivative, possessing the molecular formula C16H16NO6P. It is firmly placed within the anthelmintic pharmacological class. Naftalofos is also known by its synonyms, including Maretin and Rametin, but is chemically defined as a single-agent product. Its identity as a synthetic, chemically defined agent distinguishes it from treatments derived from natural sources, highlighting its targeted action against parasitic threats.


What Type of Preparation is Combat Used For?

The drug Combat is primarily intended as a veterinary substance for antiparasitic action against internal threats. The preparation is generally designed for the oral route of administration and is often manufactured as solid boluses—large, dense tablets—or supplied as a powder or granules. Naftalofos is used as an agent for treating nematode infections in animals. The general purpose of this specific formulation is to target and neutralize specific internal parasites, such as nematodes (roundworms), in various livestock species. This focus on livestock and the solid bolus form are factors specific to its historical veterinary positioning.


How Does Naftalofos Achieve Its General Effect?

Naftalofos achieves its therapeutic effect through its function as an Acetylcholinesterase (AChE) inhibitor. This mechanism ensures that the drug disrupts the vital neurological system of the parasite by preventing the acetylcholinesterase enzyme from regulating the breakdown of the neurotransmitter acetylcholine. This critical neurological disruption in the parasite results in continuous, unregulated nerve stimulation, which is the necessary high-impact action for the effective elimination of the targeted organism. By understanding that Naftalofos is an inhibitor, one grasps the fundamental chemical strategy employed by the medication to rapidly clear the host of the specific parasitic infestation.

What side effects are possible with Combat?

Possible Side Effects and Safety Information

The safety profile for the active ingredient, Naftalofos, is defined by its chemical class as a potent organophosphorus compound and its function as an acetylcholinesterase (AChE) inhibitor. As a compound now considered obsolete in veterinary medicine, a standard, contemporary Summary of Product Characteristics (SmPC) with specified side effect frequencies is not publicly available from major regulatory bodies. Safety information is thus based on its intrinsic chemical hazard and the known toxicological properties of its class.


High-Level Safety Characteristics

Official chemical hazard classifications indicate that Naftalofos is a substance with high intrinsic toxicity. Regulatory data specify the compound is classified as toxic if swallowed and potentially fatal in contact with skin. These classifications reflect the serious hazard potential associated with systemic exposure to the substance.


Systemic and Serious Adverse Reactions

Safety concerns primarily involve the Nervous System and the Respiratory System, consistent with the systemic effects of an AChE inhibitor. Less severe manifestations documented within this class may involve the Gastrointestinal System, presenting as nausea, vomiting, diarrhea, and stomach cramps, alongside headache and dizziness.

Serious adverse reactions resulting from acute, severe systemic exposure are well-documented for this chemical class and include life-threatening outcomes such as seizures, paralysis, loss of consciousness, and respiratory depression or failure. The immediate timing of these effects is linked to acute exposure episodes.

Overdose and Emergency Response

Overdose and when to seek help

Overdose involving this organophosphorus compound is characterized by the presentation of a cholinergic crisis. Documented manifestations include excessive secretions such as salivation and bronchorrhea, constricted pupils (miosis), excessive gastrointestinal activity, muscle fasciculations and weakness, and central nervous system effects such as confusion and seizures.


Severe Outcomes and Emergency Action

Overdose is classified as severe and life-threatening due to the high risk of respiratory failure, which can result from a combination of bronchial secretions, bronchospasm, and paralysis of the respiratory muscles. Cardiac arrhythmias and delayed muscle syndromes are also documented complications.

Immediate medical attention is required upon the detection of any signs of cholinergic overstimulation. Regulatory guidelines mandate urgent decontamination, which involves the immediate removal of all contaminated clothing and thorough flushing of the exposed skin. Management requires supportive treatment and the administration of specific antidotal agents, including Atropine (for muscarinic effects) and Oximes (to reactivate the enzyme), as specified in official prescribing information.


Population Considerations and Monitoring

In children, central nervous system findings, such as seizures and severe mental status changes, may be the most prominent initial signs. Continuous hospital monitoring is required to observe for the onset of respiratory compromise and to manage the documented toxic effects.

Therapeutic Uses of Combat

The active ingredient, Naftalofos, is a specialized veterinary anthelmintic applied in addressing internal parasitic challenges. It may assist with the management of helminthiasis in livestock.


This medication is primarily used to help with the reduction of the parasite burden associated with infections caused by major gastrointestinal nematodes in ruminants, specifically cattle, sheep, and goats. It is relevant for easing the symptom manifestations associated with active infections by parasite species such as Haemonchus contortus, Ostertagia spp., and Trichostrongylus spp., which are responsible for persistent parasitic disease. This supportive therapeutic action contributes to improved comfort during symptomatic periods.

Eligibility and Restrictions for Use

Who can and cannot use Combat?

The official eligibility profile for Combat is strictly defined by its classification as a veterinary anthelmintic for food-producing animals. Eligibility is restricted to the target ruminant species: cattle, sheep, and goats, provided they are in good health and meet specific body weight requirements.


Contraindicated Populations

Classification Population Group
Absolutely Prohibited Humans and Non-Target Companion Animals (including dogs, horses, and household pets) due to high toxicity risk.
Health Status Animals with a known hypersensitivity to Naftalofos, or those that are severely sick or stressed.

Eligibility-Related Restrictions

Use is subject to strict regulatory constraints based on food safety. Animals producing milk for human consumption are prohibited from treatment until the specific Milk Withholding Period has elapsed. Similarly, animals intended for slaughter are restricted from market entry until the mandated Meat Withholding Period is completed. Use is typically not established in the youngest animals below minimum weight thresholds.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Naftalofos (Combat) is strictly focused on a high-risk pharmacodynamic interaction involving substances that share its chemical activity.


Interaction Scope

Property Official Regulatory Documentation
Medicinal product categories with documented interactions Cholinesterase-inhibiting substances, specifically Organophosphorus Compounds and Carbamate Insecticides (or drugs).
Mechanistic basis of interactions Pharmacodynamic Potentiation. The interaction is classified as an additive or synergistic effect, resulting from the shared action of AChE inhibition.
Interaction-related restrictions Strict prohibition (contraindication) of concurrent use with other cholinesterase-inhibiting substances.

Interaction Classifications (High-Level)

Classification Property Regulatory Basis
Interaction severity classification Contraindicated Combination due to high risk of additive or synergistic toxicity.
Timing-based interaction rules A mandatory washout period is required between the administration of Naftalofos and the application/administration of other cholinesterase-inhibiting substances.

The official regulatory interaction structure is defined by the absolute prohibition of co-administering other cholinesterase inhibitors. This critical interaction pattern imposes a procedural requirement for a washout period to manage the risk of additive cholinergic toxicity. Regulatory documents do not specify clinically significant pharmacokinetic interactions or specific food or supplement contraindications.

Mechanism of Action

Naftalofos acts through a mechanism of neurological disruption that targets the parasite's motor control system. This pharmacodynamic action leads directly to the organism's physical paralysis.


Irreversible Inhibition of Parasite Acetylcholinesterase

The core mechanism involves Naftalofos functioning as an irreversible inhibitor of the Acetylcholinesterase (AChE) enzyme in the nematode. By forming a strong covalent bond with the enzyme's active site (a process called phosphorylation), the drug causes the prolonged deactivation of the enzyme's ability to hydrolyze the neurotransmitter acetylcholine (ACh). This molecular blockade immediately initiates a cascade of neurological and muscular overstimulation within the parasite.


Signal Overload and Flaccid Paralysis

The accumulation of ACh at the parasite’s synapses and neuromuscular junctions drives the continuous activation of cholinergic receptors. This excessive signaling forces the motor system into a state of severe signal overload followed by a depolarizing block. This ultimately results in complete, prolonged flaccid paralysis of the organism.

Dosage and Administration Information

The official administration guidelines for Combat (Naftalofos) define a specific usage protocol focused strictly on the oral route and body weight-based calculations. The approved route of administration is oral, utilizing dosage forms such as solid boluses or prepared liquid drench solutions. This product is classified as an anthelmintic for veterinary use.

The primary rule governing the regimen is the body weight-based dosing protocol. For target species, the standard regimen is calculated on the amount of active ingredient per kilogram of body weight (mg/kg). This includes approximately 35 mg/kg for sheep and goats, and 50 mg/kg for cattle.

The product's overall frequency pattern is a single therapeutic application. It is intended as a short-term intervention to address a current parasite load, rather than a continuous or maintenance program.

Specific preparation requirements must be followed when administering the liquid drench formulation. This formulation must be shaken thoroughly immediately before use to ensure the active component is uniformly suspended. A critical procedural condition explicitly stated in the guidelines is the restriction that the product must not be mixed with any other drench solution during administration. Adherence to these steps and to the accurate body weight measurement is essential for following the established protocol.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Combat (Naftalofos)


Evidence for Use in Gastrointestinal Nematode Infections

Naftalofos was evaluated in studies focusing on parasitic roundworm infestations in livestock. The primary evidence was derived from Controlled Efficacy Tests (CETs)—a type of controlled trial commonly applied in research contexts—as well as Faecal Egg Count Reduction Tests (FECRTs). These studies were conducted during periods of increased symptom activity where animals were naturally infected with nematodes such as Haemonchus contortus, Ostertagia spp., and Trichostrongylus spp.

These controlled trials examined the substance in comparison to animals that did not receive treatment. The core endpoints were evaluated in these studies through evaluations of the final parasite burden after a short period, and by monitoring Faecal Egg Count (FEC) measurements. The populations studied were primarily naturally infected cattle and sheep. The findings describe patterns observed in the studies where research tracked the short-term changes in both the actual worm count and the number of parasite eggs being shed.


Study Outcomes Examined in Regulatory Trials

Key outcomes were studied for their relevance to the anti-parasitic function. For instance, the absolute measurement of the physical parasite burden was studied for its relevance as a key measured outcome. Another critical outcome axis was the percentage change in faecal egg counts (FECR). This measurement is relevant in trials assessing short-term or episodic symptom patterns as it tracks changes in the reproductive cycle of the parasite soon after the substance is administered. Data gathered from these specific, objective outcomes contribute to understanding symptom patterns and are typically measured within 10 to 14 days post-administration.


What is Still Uncertain About Combat’s Research Profile

The evidence base, while providing information on acute efficacy endpoints, presents several limitations noted in the scientific literature. Primarily, follow-up durations were limited, meaning data on long-term prevention or sustained health outcomes are not fully established. There is limited information regarding how well the drug sustains parasite control over many months or how it prevents re-infection. The results apply only to the populations studied (cattle and sheep), and comparative evidence is lacking for a full range of other host species. The existing studies provide context but not individual predictions, and the evidence highlights what is known—and what is still uncertain.

Frequently Asked Questions (FAQ)

Common questions about Combat (FAQ)


Q: Is Combat used for long-term or short-term treatment?

Official administration guidelines for Combat describe its use as a single therapeutic application. The substance is intended as a short-term intervention to address a current parasite load, rather than being part of a continuous or long-term maintenance program.


Q: Does Combat have different uses beyond the main condition it treats?

Combat is firmly classified as a specialized veterinary anthelmintic. According to official sources, its use is primarily defined for antiparasitic action, specifically targeting internal parasites such as nematodes (roundworms) in livestock species.


Q: Are there any common foods or supplements that might interact with Combat?

Official regulatory documents defining drug interactions for Combat strictly focus on other medications that share a similar mechanism of action. These official sources do not specify clinically significant contraindications regarding common foods or general nutritional supplements.


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

The official regulatory profile for Combat only specifies high-risk interactions with other medications that function as cholinesterase inhibitors. This primarily includes Organophosphorus Compounds and Carbamate Insecticides, which share the same mechanism of action as Naftalofos.


Q: How long after stopping Combat can I take another medicine that interacts with it?

Official regulatory instructions require a mandatory washout period between the administration of Combat and the use of other cholinesterase-inhibiting substances. This procedural requirement is necessary to manage the risk of additive cholinergic toxicity. The duration of the required washout period is not specified within the official documentation’s core interaction structure.


Q: What if I take Combat and it doesn't seem to be working?

Regulatory trials evaluated the anti-parasitic function of Combat by tracking outcomes such as the reduction in Faecal Egg Count (FEC). These measurements, which assess changes in the parasite population, were typically monitored within 10 to 14 days post-administration.


Q: Is it true that Combat can be taken by most adults?

No. The official eligibility profile strictly defines Combat as a veterinary anthelmintic. Due to the high intrinsic toxicity of its active ingredient, use is absolutely prohibited for humans and non-target companion animals.


Q: What should I expect the first few days after starting Combat?

Manifestations documented for this drug’s chemical class may include effects on the Gastrointestinal System, such as nausea, vomiting, diarrhea, and stomach cramps. Central effects like headache and dizziness are also noted.


Q: Does Combat have any common side effects that usually go away on their own?

Official safety information documents less severe manifestations common to this chemical class, which may include effects on the Gastrointestinal System (such as nausea, vomiting, and stomach cramps) or central symptoms (such as headache and dizziness).


Q: Can Combat affect my sleep?

Adverse reactions documented for this chemical class are known to involve the Nervous System. This potential for systemic effects may include central nervous system symptoms such as headache and dizziness, as the drug acts on the nervous system.


Q: Is Combat a controlled substance?

Official hazard classifications identify Naftalofos as a substance with high intrinsic toxicity. The compound is classified as toxic if swallowed and potentially fatal in contact with skin, reflecting its serious hazard potential. While not a standard human controlled drug, its use is strictly regulated globally due to its chemical properties.


Q: How quickly does Combat start working for the condition?

The mechanism of action involves the rapid neurological disruption and subsequent paralysis of the parasite, based on the compound's chemical activity. In studies, the anti-parasitic outcome was assessed by tracking Faecal Egg Count measurements, which were typically monitored within 10 to 14 days post-administration.


Q: Is there any difference in how Combat works for men and women?

The official documentation is focused entirely on its use in the target ruminant species (cattle, sheep, and goats). Regulatory information does not contain data or make statements on efficacy differences related to human gender.


Q: Can people with kidney problems use Combat?

Combat is classified strictly as a veterinary anthelmintic. Use of this product is absolutely prohibited for all humans and non-target companion animals due to the high intrinsic toxicity risk of the active ingredient.


Q: Can people with liver problems use Combat?

Combat is classified strictly as a veterinary anthelmintic. Use of this product is absolutely prohibited for all humans and non-target companion animals due to the high intrinsic toxicity risk of the active ingredient.


Q: What is the earliest age someone can be prescribed Combat?

Combat is not intended for human use and cannot be prescribed to people at any age. In the target animal species, use is typically not established in the youngest animals below specified minimum weight thresholds.


Q: Are there specific symptoms that signal I should contact a healthcare professional while taking Combat?

Safety concerns for this drug class primarily involve the Nervous System and the Respiratory System. Serious adverse reactions resulting from severe systemic exposure include seizures, paralysis, loss of consciousness, and respiratory depression or failure.


Q: Is it possible to be allergic to an ingredient in Combat?

Official documentation lists a known hypersensitivity to Naftalofos as a contraindication for its use in the target animals. Hypersensitivity implies that an animal that is sensitive to the active ingredient should not receive the product.


Q: Can Combat affect my mood or emotional state?

Adverse reactions documented for this chemical class involve the Nervous System. This potential for systemic effects may include central nervous system symptoms such as headache and dizziness.


Q: What have clinical trials reported about the overall experience of patients taking Combat?

Clinical trials focused on objective scientific outcomes, such as the final parasite burden and faecal egg counts. The evidence gathered in these trials was designed to measure efficacy, and does not provide information on the subjective overall experience of the host animal.


Q: Is there a generic version of Combat available?

The active ingredient in Combat is Naftalofos (INN). This compound is also known by its other synonyms, including Maretin and Rametin.


Q: Does Combat cause any issues with driving or operating machinery?

Combat is strictly classified as a veterinary anthelmintic and is absolutely prohibited for human use. Official documentation does not contain information regarding its impact on human activities such as driving or operating machinery.


Q: Is Combat commonly prescribed with any other medications?

The official regulatory profile imposes a strict prohibition (contraindication) on the concurrent use of Combat with other medications that function as cholinesterase-inhibiting substances.


Q: How does the official documentation describe Combat's effectiveness in children?

Combat is not intended for human use. In the target animal species, use is typically not established in the youngest animals below specified minimum weight thresholds.


Q: Do studies suggest that Combat's benefits last after treatment is stopped?

Regulatory information indicates that the evidence base has limited follow-up durations. This means that data on the long-term prevention of re-infection or sustained health outcomes many months after administration are not fully established.


Q: Does Combat have a potential for misuse?

Combat is an obsolete veterinary product with official hazard classifications identifying it as a substance with high intrinsic toxicity. It is classified as toxic if swallowed and potentially fatal in contact with skin. It is not classified as a controlled substance intended for human use.


Q: Are there any known long-term side effects associated with Combat use?

The existing evidence base has limited follow-up durations. This limitation means that data on long-term safety, or sustained health outcomes over many months, are not fully established in the official documentation.


Q: Can people with high blood pressure take Combat?

Combat is classified strictly as a veterinary anthelmintic. Use of this product is absolutely prohibited for all humans and non-target companion animals due to the high intrinsic toxicity risk of the active ingredient.


Q: Are there any specific ingredients in Combat that are common allergens?

Official documentation lists a known hypersensitivity to the active ingredient, Naftalofos, as a contraindication for its use in the target animals.


Q: What if I am already taking a lot of supplements when I start Combat?

Official regulatory documents defining drug interactions for Combat strictly focus on other medications that share a similar mechanism of action. These official sources do not specify clinically significant contraindications regarding general nutritional supplements.

How should Combat be stored and disposed of?

How to Store and Dispose of COMBAT (Naftalofos)

The storage and disposal of COMBAT (Naftalofos) must adhere strictly to regulatory requirements to ensure product stability and prevent environmental contamination.


Official Storage Conditions

The product must be stored in a cool and dry place, protected from light and excessive heat. It is mandatory to keep the container tightly closed and to store the medicine in its original container. As a critical safety requirement, the product must be stored out of the reach of children and away from foodstuffs.


Handling and Disposal Rules

To maintain quality, the product must be protected from moisture and used before its expiry date. Disposal of unused or expired COMBAT must be carried out according to local requirements. Regulatory instructions specifically state that the product or its waste must not contaminate water due to its environmental classification.

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

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