This allows the dog to be observed for several hours following the oral dose in case of trouble. ![]() If the larval worms die too quickly, a shock-like circulatory reaction can occur so for this reason the American Heartworm Society recommends that the first dose of ivermectin be given under veterinary supervision. Ivermectin kills the developing larval worms (the incoming baby heartworms) and clears the circulating microfilariae (the newborn larvae born to the established adult worms), thus rendering the dog unable to spread its infection and minimizing the number of adult worms to be killed in the second phase of treatment when the adult worms are specifically addressed. In fact, giving an ivermectin-based heartworm preventive to an infected dog is the first step in heartworm infection treatment. In most cases, no reaction of any kind occurs when an ivermectin-based heartworm preventive is given to a heartworm-positive dog. If Given to a Heartworm Positive Dog by Accident In other words, infection takes place but is halted every month when the medication is given. These medications use an extremely low dose of ivermectin, which is adequate to kill any 元 and L4 larval stages (baby heartworms) that are inhabiting the pet’s skin tissues at the time the medication is given. For the first time, preventive medication could be given once a month instead of daily. The approval of ivermectin in 1987 represented a huge breakthrough in heartworm prevention. ![]() IVERHART PLUS®, IVERHART MAX® made by Virbac HEARTGARD®, HEARTGARD PLUS® made by Merial Whichever product you use, begin your heartworm season with a heartworm test to be sure your dog is negative and prevention can begin.
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