Drontal Cat

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Drontal Cat

Method of action: Anthelmintic

Treatment option:

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 Drontal Cat

Property Description
Active Ingredients Praziquantel and Pyrantel Pamoate
Form Scored Oral Tablet
Pharmacological Class Anthelmintic, Antiparasitic Agent
Common Use Broad-spectrum deworming in felines
Origin Synthetic chemical derivatives

Drontal Cat is a broad-spectrum veterinary antiparasitic medication formulated as an anthelmintic for the treatment of felines, including cats and kittens. This preparation is a fixed-dose combination product containing two distinct synthetic active ingredients designed to eliminate common parasitic worm infestations. The drug's general purpose is to ensure the comprehensive clearance of both major types of intestinal parasites, specifically roundworms and tapeworms, from the animal's digestive system.


What Type of Medicine is Drontal Cat?

Drontal Cat is officially categorized as an anthelmintic and antiparasitic agent, a class of medications dedicated to eliminating parasitic worms, a therapeutic approach clinically recognized by veterinary pharmacological standards. The medication is classified as a broad-spectrum dewormer due to its ability to target multiple species across different helminth classes. Clinical application of the medication supports its efficacy in clearing tapeworm and roundworm infections in cats, managing the primary parasitic burdens in the target animal group.

The active ingredients are synthetic chemical derivatives: Praziquantel is a pyrazinisoquinolone derivative, and Pyrantel Pamoate is a tetrahydropyrimidine derivative. These compounds are recognized as essential medicines for treating helminthic infections in humans and animals, highlighting their reliability and importance in parasitic disease control.


Composition and General Purpose

The medication is a combination product that utilizes the two active compounds: Praziquantel and Pyrantel Pamoate. Praziquantel primarily acts against cestodes, while Pyrantel Pamoate targets nematodes. This dual-action formula provides a beneficial synergistic effect, allowing the agents to work through distinct mechanisms—one targeting the parasite's structure and the other causing neuromuscular paralysis—to ensure effective eradication. The final result is the expulsion of the incapacitated parasites, fulfilling the drug's therapeutic purpose of restoring healthy intestinal function in cats, particularly where mixed infections are suspected or confirmed.


Form and Delivery System

Drontal Cat is provided as a scored oral tablet, a physical form designed for direct oral administration to the cat or inclusion with food. The use of a scored tablet is a practical consideration for veterinary medicine, allowing the solid dosage form to be accurately divided for proper delivery. The tablet formulation is distinctive for its use in felines and differs from similar combinations available in liquid or paste forms for other species.

Regulatory References

  1. FOI Summary NADA 141-008 for Drontal Tablets
  2. WHO Model List of Essential Medicines
  3. WHO Essential Medicines List (Praziquantel and Pyrantel)

What side effects are possible with Drontal Cat?

Possible Side Effects and Safety Information

The safety profile for the Praziquantel and Pyrantel Pamoate combination product is documented in official regulatory labeling, with adverse reactions categorized by frequency and the organ system affected.

Adverse Reaction Classification

Most documented side effects are classified as uncommon in regulatory texts. These effects are generally observed in the gastrointestinal system and are typically transient (short-lived). Key uncommon effects listed in official sources include vomiting, diarrhea, anorexia (loss of appetite), hypersalivation, and lethargy. Transitory increases in liver enzymes have also been noted within the hepatobiliary disorders system organ class.

Serious Reactions and Safety Constraints

Potential for hypersensitivity reactions (allergic reactions to the active substances) is noted in the safety profile, though the frequency is typically classified as not known or very rare. These are considered serious adverse reactions that require attention.

Population and Interaction Safety Notes

The official labeling defines specific restrictions for use in certain groups and situations:

  • Kittens: The product is contraindicated and should not be used in kittens under six weeks of age or those weighing less than 1.0 kg.
  • Pregnancy and Lactation: Use is not recommended in pregnant queens and should be used with caution during lactation.
  • Drug Interaction: The product should not be administered concurrently with piperazine compounds as this is noted as a safety limitation in regulatory documents.

These constraints establish the official boundaries for appropriate administration based on government-approved safety data.

Overdose and Emergency Response

Overdose and when to seek help: Official Regulatory Information for Drontal Cat

Documented Overdose Profile

The official safety data for Drontal Cat (Praziquantel/Pyrantel Pamoate) documents the clinical manifestations observed during safety studies involving exposure at ten times the highest recommended dosage. Observed symptoms included vomition and salivation. Regulatory information further notes reports of transient ataxia (incoordination) and a temporary loss of appetite following drug administration, indicating effects on the gastrointestinal and neurological systems.

The product is not for use in kittens less than 8 weeks old or those weighing less than 0.9 kg. This restriction establishes this low-weight, young population as particularly sensitive to drug exposure.

Emergency Response and Management

Immediate medical attention is required if an overdose or suspected adverse reaction is noted. Regulatory instructions mandate that users call the veterinary office immediately. If the primary veterinarian is unavailable, it is required to follow directions to contact an emergency facility for assessment.

The regulatory profile notes that there is no specific documented antidote for an overdose of this combination product. Management of exposure is therefore symptomatic and supportive, consistent with standard toxicological procedures initiated at an emergency facility. Observed manifestations such as transient ataxia are generally noted to resolve completely within 24 hours.

Therapeutic Uses of Drontal Cat

What Drontal Cat Treats: Main Uses and Benefits

Drontal Cat is used for managing intestinal worm infections in cats. The medication is relevant in contexts involving heightened systemic burden related to these parasites. Its application is appropriate in clinical settings marked by heightened patient distress caused by feline gastrointestinal worms.


Managing Tapeworm Infections (Cestodes)

This product is applied across domains where additional symptomatic support is needed due to the presence of Tapeworms (Dipylidium caninum and Taenia taeniaeformis). Addressing these infections with Drontal provides support that helps ease the overall symptom burden and is relevant in contexts marked by increased discomfort or tension.


Controlling Roundworm and Hookworm Clusters (Nematodes)

Drontal is relevant in contexts marked by increased discomfort or tension from Large Roundworms (Toxocara cati) and Hookworms (Ancylostoma tubaeforme). These parasites can cause symptoms that interfere with daily functioning. It is applied in addressing these symptom clusters, assisting with maintaining functional stability when the condition involves acute or disruptive symptom patterns.

General application: Supports general well-being during symptomatic phases.


Quick Fact: Used across domains where short-term symptom management is appropriate for conditions presenting with acute or recurrent episodes.

Regulatory References

  1. NLM DailyMed Drug Insert for Drontal for Cats

Eligibility and Restrictions for Use

The eligibility profile for Drontal Cat (Praziquantel/Pyrantel Embonate) is strictly defined by regulatory documents, which establish clear criteria for use based on age, physiological state, and concurrent medication.

Eligibility Status

Status Population/Condition
Allowed Cats (Feline target species). May be used during lactation (breastfeeding).
Restricted Sick animals (Use requires caution and veterinary consultation).
Contraindicated Kittens below the minimum age/weight threshold.
Contraindicated Cats receiving piperazine compounds (Prohibited due to known drug interaction).
Contraindicated Pregnant cats (Use is prohibited in many major jurisdictions until sufficient studies are performed with this combination).

Official Regulatory Rules

  • Age and Weight: The medicine is not intended for use in kittens less than 6 weeks of age in European/UK labeling. US-based labels may specify different minimums (e.g., less than one month of age or 1.5 lbs).
  • Concurrent Medication: The product must not be used simultaneously with piperazine compounds.
  • Pregnancy: Administration must not occur during pregnancy in line with major regulatory directives, although it may be used during lactation.

What should I know about interactions with other medicines?

Drontal Cat Interactions with other medicines and products

Drontal Cat tablets, containing praziquantel and pyrantel embonate (also known as pyrantel pamoate), are generally considered safe and have a low risk of clinically significant drug-drug interactions when administered as directed. However, owners should be aware of a few potential areas of caution, particularly regarding simultaneous use with certain other medications.

Medications to Use with Caution

Concurrent Medication Potential Interaction & Caution
Piperazine-containing dewormers Avoid concurrent use, as piperazine is an anthelmintic antagonist to pyrantel, potentially reducing the efficacy of both drugs against susceptible worms.
Organophosphates (e.g., some flea/tick treatments) Use with caution. Pyrantel, an anticholinergic-like agent, may potentiate the effects of organophosphates, potentially increasing the risk of adverse neurological effects, though this is less common with modern doses.

General Considerations

The praziquantel component is primarily metabolized by the liver's cytochrome P450 enzymes. While the dose in Drontal Cat is low, drugs that are potent enzyme inhibitors (e.g., cimetidine, ketoconazole) or enzyme inducers (e.g., phenobarbital) could theoretically alter praziquantel's concentration in the body. However, significant clinical effects are rarely reported. Always inform your veterinarian about all other medications, supplements, and preventatives your cat is receiving before administering Drontal Cat.

Mechanism of Action

️ How Drontal Cat Works

The drug's action is governed by two complementary and independent pharmacodynamic domains that affect distinct biological systems within different parasite classes, and is executed through distinct molecular mechanisms.


Praziquantel: Cationic Ion Channel Activation and Tegumental Disruption

This mechanism affects the biological systems of cestodes (tapeworms) by acting as a modulator of parasite ion channels, especially those controlling the influx of calcium ions (Ca^2+). The resulting massive, uncontrolled Ca^2+ influx induces immediate, non-reversible spastic paralysis and causes the disintegration of the worm's outer layer, the tegument.


Pyrantel Pamoate: Neuromuscular Cholinergic Overstimulation

This mechanism affects the biological systems of nematodes (roundworms and hookworms) by functioning as an agonist at specific excitatory nicotinic Cholinergic Receptors (nAChR) on the parasite's muscle cells. This overstimulation leads to a state of sustained, rigid spastic paralysis. The dual action of paralysis (spastic) and physical damage (tegumental disruption) prevents the targeted parasites from maintaining their intestinal position or adhering to the wall. The resulting state of incapacitation and detachment facilitates the passive removal of the organisms via the cat’s normal intestinal peristalsis.

Dosage and Administration Information

How Drontal Cat is Used: Official Administration Guidelines

Drontal Cat (praziquantel/pyrantel pamoate) is an oral veterinary anthelmintic for felines. The fundamental principle is a weight-based dosing schedule delivered as a single oral administration to treat existing parasitic infections. Dosing requires accurate measurement of the cat's body weight to ensure the minimum required therapeutic dose is reached: 5 mg/kg of praziquantel and 20 mg/kg of pyrantel base.


Administration Protocol and Timing

Procedural Element Official Instruction
Route of Administration Oral only (by mouth)
Dosing Schedule Single administration of a weight-calculated dose
Timing Relative to Meals Administered with or without food; no fasting is required
Preparation Tablets are scored to allow for accurate division to match the calculated weight-based dosage

Population-Specific Constraints

The treatment is not indicated for kittens that are less than one month of age or kittens weighing under 1.5 lbs (0.68 kg). Proper use requires that the cat is accurately weighed immediately prior to treatment to ensure the calculated dose is correct.

Since the treatment is a single-event course, a missed dose concept does not apply. However, the administration may be repeated only if a follow-up assessment, such as a fecal examination, confirms reinfection, typically within two to four weeks following the initial treatment. The tablets can be given directly by mouth or mixed into a small portion of the cat's food. This structured protocol ensures the medicine is used in accordance with the product’s intended use.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Drontal Cat

Evidence for Use in Treating Intestinal Parasite Infections

Research examined the medication's properties when applied in cats with naturally acquired infections of specific tapeworms (Dipylidium caninum and Taenia taeniaeformis), roundworms (Toxocara cati), and hookworms (Ancylostoma tubaeforme). The findings describe patterns observed in the studies, reporting on the immediate measurements related to parasite presence. Research explored outcomes related to systemic or functional imbalance. The research provides insight into short-term changes monitored through quantitative methods, such as direct worm counts and measurements related to fecal egg content.

Controlled Trials and Study Design

The core evidence was derived from studies conducted during periods of increased symptom activity related to these parasites. Study designs were well-controlled and often blinded, meaning those involved did not know which cat received the medicine and which received a placebo. Studies monitored outcomes related to functional imbalance. These controlled studies were complemented by clinical field studies exploring the medicine in various settings. Studies monitored the immediate measurements related to parasite quantity as a key metric. Research highlights changes measured during the short study period, confirming that the data show patterns related to observed changes in parasite counts under the specific conditions tested.

Long-Term Data and Follow-up Duration

Studies monitored how parasite presence evolved over defined, short time intervals immediately following administration. The follow-up durations were limited, as the primary goal of the research was to assess the initial changes measured related to parasitic infection. The key observations for changes measured during the study period were completed within approximately seven days after the single treatment. Long-term outcomes are not well characterized, and evidence is limited for outcomes extending beyond this initial evaluation period. This section clarifies the absence of long-term data regarding sustained outcomes or recurrence patterns.

Evidence in Different Feline Populations

The studies explored the use of this medicine in a broad range of cats and kittens. Research examined animals spanning from one month old up to 14 years in age, and varying significantly in size. Findings describe patterns observed in these groups, with the majority of the clinical data collected from domestic short hair and mixed-breed felines. Subgroup findings are uncertain, as the data for certain other breed groups remain insufficient. Study results reflect the specific conditions and populations under which they were conducted, and research provides context but not individual predictions for all possible feline groups.

What is Still Uncertain About the Research

Research contributes to the broader evidence landscape but certainty remains low regarding sustained effects. The results apply only to the populations studied and within the narrow timeframe evaluated. There is limited information for long-term outcomes, and the evidence quality varies across studies if considering maintenance data. The findings help contextualize patterns of short-term change, but the research does not determine whether an individual cat will experience similar long-term outcomes. Evidence describing direct comparison to other available treatments is not fully established in the core regulatory documentation.

Key Studies & References FOI Summary NADA 141-008 Original Approval September 29, 1993 (Drontal Tablets for Cats)

Frequently Asked Questions (FAQ)

Common questions about Drontal Cat (FAQ)

Q: How quickly does Drontal Cat start working after administration?

Regulatory information indicates the drug's mechanism of action involves the rapid onset of paralysis in targeted parasites. Clinical studies supporting the approval of the product reported high efficacy rates, with outcomes showing clearance of targeted parasites in most cats within approximately 7 days following treatment.

Q: Can the tablets be crushed to mix with my cat's food?

Official administration guidelines indicate the tablets may be crumbled or crushed before being mixed into a small portion of food. It is noted that one of the active ingredients gives the tablet a bitter taste, which may affect the cat's acceptance of the mixture.

Q: Is Drontal Cat available over the counter or does it require a prescription?

The availability of this product is determined by local laws and regulatory bodies. In some regions, Drontal Cat may be designated as an Over-The-Counter (OTC) Animal Drug. In other jurisdictions, it is classified as a restricted product and is only available through a licensed veterinarian.

Q: How often can I give my cat Drontal Cat for routine prevention?

The official protocol is defined as a single-administration treatment course for existing infections. Retreatment is typically reserved for cases where a follow-up fecal examination confirms reinfection with the labeled parasites. Official documents often cite a 2- to 4-week window following the initial dose for such a follow-up assessment.

Q: How will I know if the Drontal Cat treatment was successful?

Clinical studies have demonstrated the high efficacy of the treatment against the parasites listed on the label. Owners may observe the passage of large roundworms and hookworms in the cat's feces within a day or so after treatment. However, note that most killed tapeworms are often digested and are typically not visible.

Q: Does Drontal Cat also treat heartworm?

The product is officially indicated for the removal of Tapeworms, Hookworms, and Large Roundworms. The product's use is limited to the parasitic infections listed on the official label, which do not include Heartworm (Dirofilaria immitis).

Q: Does Drontal Cat have an unpleasant taste that my cat will object to?

Official information indicates that the praziquantel component of the tablet has a bitter taste. Because of this bitterness, some regulatory guidelines note that administering the whole tablet may be preferred over crushing and mixing it with food.

How should Drontal Cat be stored and disposed of?

How to Store and Dispose of Drontal Cat

Drontal Cat tablets must be stored according to official regulatory specifications to maintain product stability and integrity. The product requires storage at Controlled Room Temperature (CRT), typically between 20 C and 25 C (68 F and 77 F), and must be protected from both moisture and light.

Packaging and Stability

The container must be kept tightly closed, and tablets must remain in the original foil strip. Part-used tablets must be discarded immediately and should not be stored. The medication must be kept out of the reach of children and pets.

Disposal

Unused or expired product and empty packaging should be disposed of in the household refuse. Critically, the product must not contaminate ponds, waterways, or ditches due to the potential harm the active ingredient, praziquantel, poses to aquatic organisms.

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

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