Ponazuril is a metabolite of Toltrazuril, and is available in the United States as Marquis Paste, produced by Merial. One tube of paste contains 127 grams (4.5 oz.) at 150 mg/gm (19,050 mgs total per tube) which is a 15% solution.
Although a single tube can be quite expensive, the ‘per animal’ cost is reasonable once diluted. Ponazuril is reportedly stable in suspension and can be mixed with water and VAL syrup or other suspensions to improve palatability. The solution should be stored in a light proof container and thoroughly shaken before administration.