Description
Wormentel 500 mg (Fenbendazole 500 mg)
Wormentel 500 mg contains fenbendazole 500 mg per tablet. Fenbendazole is a benzimidazole antiparasitic medicine used in veterinary medicine to treat and control certain parasitic worms. The product shown on this page is a veterinary fenbendazole tablet from Kachhela and should not be presented as an FDA-approved medicine for people.
Because fenbendazole products can differ by animal species, formulation, strength, indication, and treatment schedule, the correct product label should guide veterinary use. A veterinarian can also determine whether fenbendazole is appropriate for a particular animal and parasitic infection.
Wormentel 500 mg Product Information
- Product name: Wormentel 500 mg
- Active ingredient: Fenbendazole
- Strength: 500 mg per tablet
- Dosage form: Tablet
- Manufacturer shown: Kachhela
- Pack information: 10 x 10 tablets, as shown on the product packaging
- Drug class: Benzimidazole anthelmintic
- Primary context: Veterinary antiparasitic use
What Is Fenbendazole?
Fenbendazole is an anthelmintic, which means it is used to control certain parasitic worms. It belongs to the benzimidazole class of medicines.
Veterinary fenbendazole products are available in different formulations and strengths. FDA records currently list several approved animal-drug products containing fenbendazole, including Panacur, Safe-Guard, and Defendazole products.
However, the approval of a particular veterinary fenbendazole product does not mean that every fenbendazole tablet or brand is approved for every animal species or for human use.
What Is Wormentel 500 mg Used For?
Fenbendazole is used in veterinary medicine for certain parasitic worm infections. The exact approved use depends on the animal species and the individual product label.
For example, FDA-approved fenbendazole products cover specific parasitic infections in animals such as dogs, cats, horses, cattle, goats, and other specified species. Therefore, veterinary treatment should always follow the applicable product labeling.
The FDA’s current animal-drug information provides a useful reference for identifying approved fenbendazole products and their approved uses.
How Does Fenbendazole Work?
Fenbendazole belongs to the benzimidazole group of anthelmintic medicines. It interferes with biological processes that susceptible parasites need to survive.
As a result, the medicine can impair the normal cellular functions of certain worms. The exact activity can vary according to the parasite and animal species.
Wormentel 500 mg Strength
Wormentel 500 mg contains 500 mg of fenbendazole in each tablet according to the product presentation.
The number 500 mg describes the tablet strength. It does not mean that 500 mg is an appropriate dose for every animal or every infection.
Veterinary dosing may depend on body weight, species, parasite, formulation, treatment duration, and the approved product label. Therefore, do not use the tablet strength alone to calculate a treatment schedule.
Fenbendazole Dosage Information
Fenbendazole dosage is product-specific. Different animals and different veterinary indications can require different dosing schedules.
For example, the FDA’s January 2026 approval of Defendazole specifies a particular weight-based dose for certain cattle, dairy cattle, and goats. That dosing information applies to the approved Defendazole product and its labeled indications; it should not automatically be transferred to Wormentel 500 mg or another formulation. :contentReference[oaicite:3]{index=3}
For this reason, a veterinarian should determine the appropriate dose, frequency, and duration for the intended animal.
How to Take or Administer Fenbendazole Safely
Use fenbendazole according to the specific veterinary product label or veterinary instructions.
First, confirm the animal species and diagnosis. Next, check the product strength and treatment instructions. Finally, follow the recommended duration without independently increasing or extending treatment.
If symptoms continue after treatment, contact a veterinarian rather than repeatedly giving additional doses.
Fenbendazole for Dogs
Fenbendazole has approved veterinary uses in dogs. FDA information states that fenbendazole products have been approved for use in dogs, including products such as Panacur C and Safe-Guard Canine.
However, the correct treatment depends on the animal, diagnosis, product, and labeled duration.
FDA has also reported cases of bone marrow hypoplasia and pancytopenia associated with extra-label use in dogs, particularly when fenbendazole was used longer than the labeled duration. Therefore, extending treatment without veterinary guidance can create additional safety concerns.
Fenbendazole for Cats
Some FDA-approved fenbendazole products have veterinary applications involving cats. However, treatment should depend on the specific indication and veterinary product.
Do not assume that a fenbendazole dose or treatment schedule used for another animal automatically applies to cats.
Fenbendazole for Horses
Fenbendazole is also used in veterinary medicine for certain parasitic infections in horses.
The appropriate formulation and treatment schedule depend on the horse, the suspected parasite, and the approved product information. A veterinarian can help select an appropriate treatment.
Fenbendazole for Cattle and Goats
FDA-approved fenbendazole products also include products for certain cattle and goat indications.
In January 2026, FDA approved Defendazole, a fenbendazole oral suspension, for specified worm infections in beef and dairy cattle and goats. The approval includes specific withdrawal periods and labeled dosing requirements.
These instructions apply to the approved Defendazole product and should not be assumed to apply to Wormentel 500 mg.
Fenbendazole for Food-Producing Animals
Extra care is necessary when treating food-producing animals. Approved products can have specific withdrawal periods before meat or milk enters the food supply.
For example, FDA states that Defendazole has an 8-day cattle withdrawal period and a 48-hour milk discard period, while the approved goat use has a 6-day withdrawal period.
Always follow the withdrawal requirements printed on the applicable approved product label.
Fenbendazole Side Effects
Side effects can vary according to animal species, product, dose, duration, and individual health status.
Owners should monitor animals for unusual changes during treatment. Contact a veterinarian if the animal develops significant weakness, persistent gastrointestinal symptoms, allergic reactions, or other concerning signs.
Do not increase the dose or extend treatment without veterinary advice.
Fenbendazole and Long-Term Use
Longer treatment is not automatically safer or more effective. In fact, FDA has reported cases of bone marrow hypoplasia and pancytopenia in dogs associated with extra-label fenbendazole use, including treatment longer than the labeled duration.
Therefore, treatment duration should follow the approved label or a veterinarian’s specific instructions.
Fenbendazole Drug Interactions
Before using fenbendazole, tell the veterinarian about all medicines, supplements, and other antiparasitic products the animal receives.
Combining several medicines without professional guidance can increase treatment complexity and may create avoidable safety concerns.
A veterinarian can review the animal’s complete treatment plan and determine whether fenbendazole is appropriate.
Fenbendazole and Ivermectin
Fenbendazole and ivermectin are different antiparasitic medicines. They belong to different drug classes and have different approved uses and treatment instructions.
Although both medicines are discussed as deworming products, they should not automatically be combined or substituted for one another.
A veterinarian should determine which medicine is appropriate based on the parasite, animal species, diagnosis, and approved product information.
Fenbendazole for Humans
Wormentel 500 mg should not be presented as an FDA-approved human medicine.
Current FDA information identifies fenbendazole as an active ingredient in approved animal-drug products. FDA’s animal-drug database lists multiple fenbendazole products and their veterinary applications.
Therefore, people should not use Wormentel 500 mg for self-treatment of a medical condition. Veterinary medicines can differ from human medicines in formulation, labeling, approved indications, quality standards, and dosing instructions.
Fenbendazole and Cancer
Fenbendazole has received attention online because of laboratory research and claims about possible anticancer activity. However, these claims should not be treated as proof that fenbendazole is an established cancer treatment for people.
A previously published 2025 case report described three people who self-administered fenbendazole during cancer treatment. However, PubMed now identifies that publication as a retracted article, with a retraction statement published in January 2026.
Consequently, this case report should not be used as reliable evidence that fenbendazole treats or cures cancer.
People with cancer should discuss evidence-based treatment options with an appropriately licensed oncology professional rather than replacing prescribed treatment with veterinary medicines.
Fenbendazole and Pregnancy in Animals
Pregnancy-related safety depends on the animal species and the specific veterinary product.
If a pregnant animal requires antiparasitic treatment, consult a veterinarian before using fenbendazole. Do not assume that safety information from one species applies to another.
Fenbendazole and Lactating Animals
For animals producing milk for human consumption, follow the specific approved product label.
Some fenbendazole products have milk-discard requirements. Therefore, product-specific instructions are important before treating a lactating animal.
What If a Fenbendazole Dose Is Missed?
If a scheduled dose is missed, follow the instructions provided with the specific product.
Do not automatically give an additional dose to compensate. If you are unsure how to continue treatment, contact a veterinarian.
Fenbendazole Storage
Store Wormentel 500 mg according to the product packaging and applicable storage instructions.
- Keep the tablets in their original packaging when appropriate.
- Protect the product from unsuitable temperatures and moisture.
- Keep the medicine away from children.
- Prevent access by animals that should not receive the medicine.
- Do not use damaged or improperly stored medicine without professional advice.
Wormentel 500 mg Price and Availability
The price and availability of Wormentel 500 mg may vary according to pack size, destination, shipping requirements, and local regulations.
Before ordering a veterinary medicine, confirm that the product is appropriate for the intended animal and that its use complies with applicable requirements in the destination country.
Related Fenbendazole Products
If you are comparing fenbendazole products, the following related products may also be available in our Fenbendazole collection. Each product has a different tablet strength, so the strength alone should not be used to determine the appropriate dose.
- Fenbendazole 150 mg (Wormentel)
- Fenbendazole 222 mg Tablets
- Fenbendazole 444 mg
- Wormentel 500 mg (Fenbendazole 500 mg)
For additional Fenbendazole products and available strengths, visit our
Fenbendazole category
.
Wormentel 500 mg FAQs
What is Wormentel 500 mg?
Wormentel 500 mg is a fenbendazole tablet containing 500 mg of fenbendazole per tablet according to the product presentation. Fenbendazole is an antiparasitic medicine used in veterinary medicine.
What is fenbendazole used for?
Fenbendazole is used in veterinary medicine to treat and control certain parasitic worms. The exact indication depends on the animal species and approved product.
Is Wormentel 500 mg approved for humans?
Wormentel 500 mg should not be described as an FDA-approved human medicine. FDA records identify fenbendazole products as veterinary medicines.
Is fenbendazole a deworming medicine?
Yes. Fenbendazole is an anthelmintic medicine used against certain parasitic worms in animals.
Does 500 mg mean the animal should receive 500 mg?
No. The 500 mg figure identifies the amount of fenbendazole in the tablet. The appropriate dose depends on the animal, body weight, parasite, product, and label.
Can Wormentel 500 mg be used for dogs?
Fenbendazole has approved veterinary uses in dogs, but the appropriate product and treatment schedule should follow veterinary labeling. Wormentel 500 mg should not automatically be substituted for another approved fenbendazole product.
Can fenbendazole be used for cats?
Some fenbendazole products have veterinary applications involving cats. However, the appropriate product and treatment depend on the animal and indication. Veterinary advice is recommended.
Can fenbendazole be used for horses?
Fenbendazole has veterinary uses in horses for certain parasitic infections. The appropriate treatment depends on the horse and the approved product instructions.
Can fenbendazole treat cancer?
Fenbendazole is not an established FDA-approved cancer treatment for people. A previously published case series involving fenbendazole and cancer was retracted in 2026, so it should not be used as reliable clinical evidence.
Can fenbendazole and ivermectin be taken together?
Fenbendazole and ivermectin are different antiparasitic medicines. Do not combine them without appropriate veterinary guidance.
What are the safety concerns with long-term fenbendazole use?
Longer treatment can create additional safety concerns. FDA has reported bone marrow hypoplasia and pancytopenia in dogs associated with extra-label use, including treatment beyond the labeled duration.
Where can I find official information about fenbendazole?
The FDA provides official information about approved animal drugs containing fenbendazole. The FDA’s current animal-drug database lists several fenbendazole products.
U.S. Regulatory Information
Fenbendazole is an FDA-approved veterinary active ingredient used in multiple animal-drug products. FDA’s current approved animal-drug records list fenbendazole products including Panacur, Safe-Guard, and Defendazole.
FDA’s January 2026 approval of Defendazole further confirms an approved fenbendazole product for specified uses in beef and dairy cattle and goats.
However, approval of one veterinary product does not establish approval of every fenbendazole brand, strength, formulation, or use.
Important Safety Information
- Wormentel 500 mg contains fenbendazole.
- Fenbendazole is used in veterinary medicine for certain parasitic worm infections.
- Wormentel 500 mg should not be presented as an FDA-approved human medicine.
- The 500 mg tablet strength is not a universal dose.
- Follow the specific veterinary product label.
- Do not extend treatment without veterinary guidance.
- Do not combine antiparasitic medicines without professional advice.
- Use extra caution with food-producing animals because withdrawal requirements may apply.
- Contact a veterinarian if an animal develops concerning symptoms.
Official Sources and Further Information
For additional regulatory and safety information, consult these authoritative sources:
- FDA: Fenbendazole information
- FDA Animal Drugs @ FDA: Approved animal drugs containing fenbendazole
- FDA: Defendazole fenbendazole approval
- FDA: Fenbendazole safety information for dogs
- PubMed: Retraction statement concerning a fenbendazole cancer case series
Disclaimer
This information is provided for educational purposes and does not replace advice from a licensed veterinarian or healthcare professional.
Product indications, formulations, labeling, availability, and regulatory requirements can vary by country. Always check the current product packaging and applicable regulations before using a veterinary medicine.
Important: Wormentel 500 mg contains fenbendazole and should not be represented as an FDA-approved human medicine. People should not use veterinary medicines for self-treatment without appropriate advice from a licensed healthcare professional.
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