DELIVERY FORM: «feed additives and medicated feeds» for oral administration with drinking water.

ACTIVE INGREDIENT(S): fenbendazole 200 mg/mL (equivalent to 20.0%)

CHEMICAL CLASS of the active ingredient(s): benzimidazole


PARASITES CONTROLLED (spectrum of activity)


  • Gastrointestinal worms: large roundworms (Ascaris suum, adult, intestinal and migrating larval stages); nodular worms (Oesophagostomum dentatum, adult stages); whipworms (Trichuris suis, adult stages).


  • Large roundworms (Ascaridia galli, L5 and adult stages); Heterakis gallinarum (L5 and adult stages).
  • Do not use in case of Capillaria spp infestations! The efficacy of the veterinary medicinal product at the recommended dosage is not sufficient for the treatment of infestations with Capillaria spp. The absence of Capillaria spp infestation should be confirmed prior to use of the product. In case of Capillaria infestation another appropriate anthelmintic veterinary medicinal product should be used. 



  • 2.5 mg fenbendazole per kg body weight per day (equivalent to 0.0125 ml Panacur AquaSol).
    • For the treatment and control of Ascaris suum and Oesophagostomum spp this dose has to be administered on 2 consecutive days.
    • For the treatment and control of Trichuris suis the dose has to be administered on 3 consecutive days.


  • 1 mg fenbendazole per kg body weight per day (equivalent to 0.005 ml Panacur AquaSol).
  • This dose has to be administered on 5 consecutive days.

Read the product label for specific detail on dosage.

* Country-specific differences may apply: read the product label.


  • LD50 (acute oral) in rats: >10000 mg/kg (for the a.i.)
  • LD50 (acute dermal) in rats: n.a.

Suspected poisoning? Read the article on fenbendazole safety in this site.

Withholding periods (=withdrawal times) in days for meat & eggs (country-specific differences may apply: read the product label)

  • Meat: Pig: 4 days; Poultry 6 days
  • Eggs: NIL

WARNING !!!: Never use on humans, dogs or cats

You may be interested in the following articles in this site dealing with the general safety of veterinary products:


Risk of resistance? LOW

There are a few reports on resistance of Oesophagostomum worms to benzimidazoleslevamisole and pyrantel (mainly in Europe) but so far the problem is much less frequent and severe than in sheep or cattle.

This means that if this product does not achieve the expected efficacy against the mentioned parasites, there is a certain risk that it is due to resistance and not to incorrect use, which is usually the most frequent cause of product failure.

Alternative chemical classes/active ingredients to prevent resistance of gastrointestinal roundworms through product rotation in swine:

These alternative products may not be available in all countries or may not be effective against all the concerned parasites.

Learn more about resistance and how it develops.


Are the active ingredients of this product ORIGINAL* or GENERICS**?


*Meaning that they are still patent protected and generics are not yet available
**Meaning that they have lost patent protection and may be acquired from manufacturers of generic active ingredients other than the holder of the original patent.

COUNTRIES where this brand/product is marketed: UK, Ireland and other EU countries
GENERIC BRANDS available? Yes, in some countries, but not too many

Click here to learn more about GENERIC vs. ORIGINAL drugs.

Click here for an overview on the most used antiparasitic feed additives and medicated feeds for livestock and horses.


PANACUR is the original brand for fenbendazole products introduced by HOECHST  (→ INTERVET → MERCK ANIMAL HEALTH) for numerous wormers containing fenbendazole, in this case a specific liquid formulation for swine.

Fenbendazole is a veteran anthelmintic introduced in the 1970s (by HOECHST, now MSD = MERCK ANIMAL HEALTH). Fenbendazole has a broad-spectrum of activity against roundworms (gastrointestinal and pulmonary) and, depending on the dose also against tapeworms, but is ineffective against flukes. Fenbendazole also kills eggs of roundworms (ovicidal activity). As all benzimidazolesfenbendazole has no efficacy whatsoever against external parasites (ticksflies, lice, mites, etc). Among the benzimidazoles fenbendazole is quite comparable with oxfendazole in terms of efficacy and safety. Fenbendazole is abundantly used worldwide in numberless generic brands for livestock, horses and pets.

As all benzimidazoles (as well as other anthelmintics such as levamisole, monepantel, and tetrahydropyrimidines), fenbendazole for oral administrartion has no residual effect, i.e. it kills the parasites shortly after administration, but as soon as medicated feeding is interrupted it does not significantly protect the animals against re-infestation by infective stages in their environment.

Both for livestock and pets fenbendazole is often used in combinations that broaden the spectrum of activity or try to overcome potential resistance. Typical mixtures for livestock include a flukicide (e.g. closantel, etc.) and/or a macrocyclic lactone, and/or levamisole, although such mixtures are not approved everywhere. For dogs and cats it is often combined with a taenicide (e.g. praziquantel).


This article IS NOT A PRODUCT LABEL. It offers complementary information that may be useful to veterinary professionals and users that are not familiar with veterinary antiparasitics. 

Information offered in this article has been extracted from publications issued by manufacturers, government agencies (e.g. EMEA, FDA, USDA, etc.) or in the scientific literature. No guarantee is given on its accuracy, integrity, sufficiency, actuality and opportunity, and any liability is denied. Read the site's DISCLAIMER.

In case of doubt contact the manufacturer or a veterinary professional.