Up To Date Canine Health News
On August 13, Virbac Animal Health, Inc. announced that it was recalling certain lots of Iverhart PlusŪ Flavored Chewable Tablets, a heartworm preventative. Routine stability testing found these lots no longer contained enough ivermectin to be effective for dogs weighing more than 75 pounds. Lot numbers 090093 and 090095 of Iverhart Plus Large (51-100 pounds) were recalled. A third lot for small dogs (up to 25 pounds), 090073, was also recalled because it was found to be nearing the potency limit. These lots were sold to distributors starting March 20, so any product purchased earlier would not be affected. The recalled product is not harmful, but may leave larger dogs unprotected from heartworm infection. Virbac recommends that dogs who weigh more than 75 pounds who were given the recalled product be tested five to six months after the last dose was given (I advise waiting the full six months to test your dog, since it can take that long for heartworm larvae to mature into adults that can be detected by heartworm tests).