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CORID Products

The proven power of CORID® (amprolium).
  • CORID is the first and #1 selling1 coccidiostat labeled as an aid in the prevention and treatment of coccidiosis (bloody scours) in beef and dairy calves.

  • Only CORID offers a wide range of formulations and package sizes to fit your needs - 9.6% oral solution in gallons or pints, 20% soluble powder in 10-ounce packets or convenient CORID in-feed formulations.*

  • CORID is approved for use in USDA Natural Beef and Never Ever 3 programs when used according to the label.2,3

  • Amprolium has a unique mode of action.

How CORID works
Structurally, CORID mimics thiamin (Vitamin B1) which is required by coccidia for normal growth and reproduction. When coccidia ingest CORID, they experience thiamin deficiency and starve from malnutrition. 

When CORID works
CORID stops coccidia at a critical stage in the host animal's small intestine to prevent more damaging coccidiosis in the large intestine. By acting on the young asexual stages of the coccidia life cycle, CORID allows exposure to first-generation schizonts, so the host animal can develop natural immunity to coccidia. This makes CORID effective as a preventive therapy.

How CORID pays
PREVENT THE DISEASE - Use a 21-day prevention program.
  • Administer CORID when experience tells you conditions are favorable for the development of coccidiosis or any time cattle are exposed to unusual stress

  • CORID effectively breaks the coccidia life cycle before a clinical coccidiosis outbreak can occur

  • Preventing coccidiosis allows animals to absorb nutrients naturally, so they maintain the ability to fight stress

  • CORID helps to reduce the spread of infective coccidia oocysts
TREAT THE OUTBREAK - Use a five-day treatment program.
  • Administer CORID at the first clinical sign of coccidiosis, such as diarrhea and dehydration

  • CORID stops the development of merozoites before they further damage the large intestine

  • CORID helps to reduce oocyst discharge in the feces, to reduce disease spread

  • Drinking water or drench administration ensures CORID will reach the intestine, even in animals with reduced feed intake and low gastrointestinal motility

  • CORID treats clinical coccidiosis

CORID. To help prevent and treat coccidiosis, count on the expert.

  • Unique flexibility. CORID is labeled to both help prevent and treat bovine coccidiosis (bloody scours) caused by Eimeria bovis and E. zurnii in calves.

  • Administration flexibility. CORID can be administered in drinking water, as a drench, or in-feed to prevent or treat bovine coccidiosis.

  • CORID should be used on a group, pen or herd basis. When one or more calves show clinical signs of coccidiosis, it's likely the rest of the group has been exposed to coccidia and all calves in the group, pen or herd should receive CORID.

  • Palatable. CORID is palatable and readily accepted by cattle.

  • Safety. CORID is safe when administered at the recommended dose.

Important Safety Information: Withdraw 24 hours before slaughter. Do not use in calves to be processed for veal.

For technical information on CORID(amprolium) Brand Products, click on the product data sheets below or download a printable pdf of the CORID Mixing and Administration Guidelines.

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20% Soluble Powder
(10 oz. packet x 24 per case)
Product Data Sheet (pdf)

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9.6% Oral Solution
(16 oz. bottle x 12 per case)
Product Data Sheet (pdf)

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9.6% Oral Solution
(1 gal. bottle x 4 per case)
Product Data Sheet (pdf)

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1.25% Crumbles/Pellets
Type C Medicated Feed*
(50 lb. bag)


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2.5% Crumbles/Pellets
Type B Medicated Feed*
(50 lb. bag)
CORID brand products are sold via veterinary clinics and farm supply locations that carry animal health products. If you can't find CORID brand products locally or have any other questions, please call MERIAL at 1-888-637-4251 (select option 1, then press 2) to reach a Merial large-animal customer care representative.

*CORID in-feed formulations are made by and available from licensed feed manufacturers.
1Data on file at Merial.
2Federal Register. Rules and regulations. 2008;73(197):59479–59482.
3Data on file at Merial.
Important Safety Information: Withdraw 24 hours before slaughter. Do not use in calves to be processed for veal.
©CORID and CATTLE HEAD LOGO are registered trademarks of Merial.
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