A WSU study identified a risk of severe adverse effects in cats with the genetic mutation to eprinomectin, an active ingredient in top-selling parasite preventatives like NexGardCombo and Centragard.
WSU researchers have identified a growing list of common drugs and products that can cause serious and potentially fatal reactions in cats with the feline MDR1 mutation.
Carlee, a 7-year-old yellow lab, is a mutant. Like many of her human redheaded counterparts, Carlee has a mutation in the MC1-R gene, or melanocortin 1 receptor. The gene is responsible for producing melanin, a pigment that determines hair, or in this case, coat color.