Active Ingredient

Fenbendazole

Fenbendazole is an antiparasitic medication commonly used to treat infections caused by parasitic worms. It is often utilized in both human and veterinary medicine.

This medication helps in managing conditions where parasitic infections are present, aiding in the elimination of these unwanted organisms from the body.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Fenbendazole Brands

Fenbendazole

Strengths 222 mg, 444 mg

FBD

Strengths 150 mg, 222 mg, 444 mg, 500 mg

Fenbendazole Uses

Fenbendazole is typically used to treat a variety of parasitic infections. It helps in managing and eliminating worms and other parasites.

Roundworm infections
Hookworm infections
Whipworm infections
Tapeworm infections
Mixed parasitic infections

How Fenbendazole Works

Fenbendazole works by interfering with the energy metabolism of parasitic worms. It disrupts the function of certain proteins within the parasites, which are essential for their survival.

This disruption leads to the death of the parasites, allowing the body to eliminate them naturally.

Common side effects of Fenbendazole

Not everyone experiences side effects from Fenbendazole, and many side effects are mild and temporary. However, some individuals may notice certain reactions.

Nausea
Vomiting
Diarrhea
Stomach pain
Headache
Dizziness
Fatigue

If you experience severe or persistent side effects, it is important to contact your healthcare provider.

Monitor your symptoms and report any severe or unusual reactions to your doctor.
Avoid consuming alcohol while taking this medication, as it may increase the risk of side effects.
Inform your healthcare provider about any other medications you are taking to avoid potential interactions.
Do not use Fenbendazole if you have a known allergy to it or similar medications.
Consult your doctor if you are pregnant, planning to become pregnant, or breastfeeding.

Always consult your healthcare provider for personalized medical advice.

Frequently Asked Questions

What is Fenbendazole used for?

Fenbendazole is used to treat infections caused by various parasitic worms, including roundworms, hookworms, and tapeworms.

How does Fenbendazole work?

It works by disrupting the energy metabolism of parasites, leading to their death and eventual elimination from the body.

What should I do if I miss a dose?

If you miss a dose, take it as soon as you remember. If it’s almost time for your next dose, skip the missed dose and continue with your regular schedule.

Are there any interactions with other medications?

Fenbendazole may interact with other medications. It’s important to inform your doctor about all the medicines you are taking.

Can I take Fenbendazole during pregnancy?

You should consult your doctor before taking Fenbendazole if you are pregnant or planning to become pregnant.