Dewormers Dogs & Cats

Panacur (Fenbendazole) for dogs and cats

Treats roundworms, hookworms, whipworms, lungworms, some tapeworms and Giardia. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerPanacur (fenbendazole) is a over the counter medicine for dogs and cats. It starves worms by blocking how they take in nutrients. The most common side effects: usually none.

Key facts

Generic nameFenbendazole
Common brand namesPanacur, Safe-Guard
Used inDogs & Cats
TypeDewormers
Prescription?Over the counter (ask your vet first)
Typical US priceNot listed (no reliable public source)

What it's used for

Treats roundworms, hookworms, whipworms, lungworms, some tapeworms and Giardia. [1]

How it works

It starves worms by blocking how they take in nutrients. [1]

Side effects and cautions

Common side effects: Usually none. Sometimes drooling, vomiting or diarrhea. [1]

Use with care: Not for puppies under six weeks. Some forms are sold over the counter; ask your vet which worms you're treating. [1]

Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.

About dosingDosing is your vet's call. We don't list doses because the right amount depends on your pet's weight, age, health and other medicines. Don't change a dose or stop a medicine without asking your vet, and never give a pet medicine meant for people unless your vet tells you to [2].

What it costs

We don't list a price for this one because we couldn't find a reliable public source. Ask your vet or pharmacy for a quote; prices depend on your pet's size, the dose and where you fill it.

Panacur FAQ

What is Panacur used for in dogs and cats?

Treats roundworms, hookworms, whipworms, lungworms, some tapeworms and Giardia.

What are the side effects of Panacur?

Usually none. Sometimes drooling, vomiting or diarrhea.

Does Panacur need a prescription?

Many forms are sold without a prescription. Still, check with your vet first. Pet doses and safe products are not the same as for people.

How much Panacur should I give my pet?

Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.

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This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.

Sources (2) — tap to show
  1. VCA Animal Hospitals – Fenbendazole (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs