DELIVERY FORM: controlled release capsule for oral administration.


  • for adult sheep: 160 mg/capsule
  • for weaner sheep: 80 mg/capsule

CHEMICAL CLASS of the active ingredient(s): macrocyclic lactone


PARASITES CONTROLLED (spectrum of activity)


For the treatment and 100 day control of sensitive strains of gastrointestinal roundworms and lungworms in sheep.


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

  • One 160 mg capsule per animal weighing 40 to 80 kg. 2 capsules for animals over 80 kg.
  • One 80 mg capsule per animal weighing 20 to 40 kg.


  • LD50 (acute oral) in rats: for the a.i. 50 mg/kg (source: MSDS)
  • LD50 (acute dermal) in rats: for the a.i. >660 mg/kg (source: MSDS)

Suspected poisoning? Read the articles on ivermectin safety in this site.

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

  • Meat: 126 days (ESI 126 days)
  • Milk for human consumption: Do not use in female sheep which are producing, or may in the future produce, milk or milk products for human consumption.  

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? YES

Unfortunately, resistance of several gastrointestinal roundworms to ivermectin (and other macrocyclic lactones) is already very high and very frequent worldwide in sheep and goats.

This means that if this product does not achieve the expected efficacy against the mentioned parasites, it can be 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:

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

It is highly recommended to periodically check the resistance status of each property performing appropriate tests (e.g. fecal egg counts) under supervision of a veterinary doctor. Such tests are now routinely available for most producers in developed countries.

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: Australia, New Zealand
GENERIC BRANDS available? NOT in the form of capsules so far; dozens in the form of injectables or drenches.

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

For an overview on the most used drench or capsule brands for livestock click here.


IVOMEC MAXIMIZER is a slow-release capsule brand with original ivermectin. Ensures 100 day control of ivermectin-sensitive strains of internal and external parasites.

Ivermectin was the first macrocyclic lactone introduced in the market in the early 1980s (by MSD AGVET, later MERIAL). It was a milestone and a tremendous progress that revolutionized the control of veterinary parasites. Depending on the delivery form and the dose it is effective against most species of roundworms that affect ruminants and against many external parasites (mainly lice, mites, etc), but not against tapeworms or flukes. Nowadays and worldwide there are hundreds if not thousands of veterinary antiparasitics for livestock, horses or pets containing ivermectin alone or in combination with other active ingredients. Ivermectin is also used in agricultural pesticides.

Click here for general information on good practices for the prevention and control of gastrointestinal worms in livestock.


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.