Interceptor does not contain ivermectin - different drugs.
However, dogs with the mutant gene are also susceptible to the active ingredient in Interceptor. I give interceptor at 1/5 the U.S. Dose, which is called the Safeheart dose, and only effective for HW and not the other parasites.
Back to the OP, my understanding when using the liquid, is that you have to be *very* careful about dosing.
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