pimpernal- The horse wormer, Ivomec, is 1% ivermectin. According to the package, it contains 10mg of the active ingredient ivermectin per ml or cc. That means each cc contains 10,000mcg, not 1000mcg. So 1/4 of a cc contains 2500mcg, not 250mcg. The 1...

The 1/10 cc of Ivomec per 10 lb. of dog MAY be effective and safe, but it is NOT AT ALL equivalent to the dosage found in Heartguard! I couldn't find the info on the Ivomec page, but all of the online retailers who sell it indicate in the product inf...