Ivermectin is highly effective for preventing heartworm disease, but it is generally not recommended as the sole treatment for an established adult heartworm infection. The American Heartworm Society recommends it as part of a prevention program, not a standalone cure for adult worms.
You absolutely cannot use ivermectin to treat a dog with active heartworm disease. This could result in catastrophic, life-threatening side effects resulting in the sudden death of your dog from ivermectin toxicity. In addition, ivermectin will not kill adult heartworms so will not be an effective treatment.
Dosage: HEARTGARD® PLUS should be administered orally at monthly intervals at the recommended minimum dose level of 6 mcg of ivermectin per kilogram (2.72 mcg/lb) and 5 mg of pyrantel (as pamoate salt) per kg (2.27 mg/lb) of body weight.
For example, in dogs, ivermectin may be used to treat mites (demodectic mange, scabies, and ear mites), intestinal parasites (hookworms, roundworms), and capillaria. In cats, ivermectin may be used to treat ear mites and cat scabies. Many drugs are commonly prescribed for off-label use in veterinary medicine.
Laboratory studies indicate that the MP3 strain is resistant to three of the four different monthly heartworm medications; ivermectin, milbemycin and selamectin but MP3 is not resistant to moxidectin.
Ivermectin is given monthly for heartworm prevention, daily or every other day for demodectic mange treatment, and every week or couple of weeks for most mites. If a dose of heartworm preventive is accidentally forgotten, it is important to give it as soon as it is remembered.
Ivermectin and Pyrantel are both anthelmintics or dewormers. Ivermectin is commonly known as a heartworm preventative by eliminating the tissue stage of heartworm larvae (Dirofilaria immitis). It is a monthly anti-parasitic agent that paralyzes, kills, and treats infections caused by gastrointestinal parasites.
Which Breeds Can Be Sensitive to Ivermectin?
The amount of ivermectin in standard dog heartworm prevention is not likely to cause an emergency in non-sensitive dog breeds if they consumed 1-2 tablets above their normal dosage. However, ingesting a large number of tablets or medication intended for a larger animal may be a concern for your dog.
Ivermectin begins killing certain parasites within hours after administration, but symptom relief and full parasite clearance may take several days to weeks depending on the infection and individual response.
HEARTGARD Plus chews contain 2 active ingredients, ivermectin and pyrantel. The ivermectin works to prevent heartworm disease by allowing the immune system to recognize and inactivate heartworm larvae before they can develop into adults.
Symptoms of Ivermectin Toxicity in Dogs
Take ivermectin on an empty stomach. Food can increase the amount of medicine your body absorbs. It is unknown if drinking alcohol will affect ivermectin. The risk of sleepiness and dizziness may be increased if you drink alcohol while taking ivermectin.
Moxidectin-doxycycline (moxi-doxy) provides a viable alternative to no treatment at all, in cases where arsenical treatment is not possible. Based on current evidence, the most effective non-arsenical treatment regimen is doxycycline 10 mg/kg PO q 12 or 24 h for 28 days, combined with topical moxidectin at label dose.
How long can a dog live with heartworms? Dogs are able to live for years with this parasite, however, their condition will continuously worsen. It's a dangerous disease overall, which is why some people have even described untreated heartworms as the “slow kill.”
It is critical that your pet be kept under strict exercise restriction and confinement for 4 weeks after each phase of the heartworm treatment. Life threatening complications may arise if your pet is not confined. Specifically, your dog should not be allowed to run loose, play with other dogs, or go for any long walks.
Anecdotal evidence suggests that herbs such as garlic, black walnut and wormwood, and the homeopathic heartworm nosode, may actually prevent as well as treat infection. Unfortunately, I have not yet been able to find substantive proof that these therapies can reliably and safely prevent or treat infection or disease.
The prognosis of ivermectin toxicosis depends on the amount of drug ingested, the individual sensitivity of the affected dog, the overall health of the dog prior to ingestion, and whether symptoms respond to treatment. Overall, the prognosis is fair to good with appropriate supportive care.
Common indicators of heartworm infection are as follows:
Fortunately, multiple drugs can kill heartworms and treatment has a high success rate. Heartworm treatment typically uses melarsomine and/or ivermectin. Some dogs will also receive an antibiotic.
Ivermectin does not kill adult heartworms. Ivermectin does shorten the lifespan of adult heartworms. Ivermectin does sterilize adult heartworms. Ivermectin does kill microfilaria (keeping the dog from being a source of contagion).
Ivermectin (a drug in the avermectin family) is used for control of parasites in animals. It's mainly used to treat gastrointestinal and lung parasites and certain external parasites found in cattle, sheep, horses, dogs, cats and swine. It can also be used as heartworm prevention in dogs and cats.
Heartworm preventives do not kill adult heartworms. Also, giving a heartworm preventive to a dog infected with adult heartworms may be harmful or deadly. If microfilariae are in the dog's bloodstream, the preventive may cause the microfilariae to suddenly die, triggering a shock-like reaction and possibly death.
Simparica Trio Chewable Tablet for Dogs is our vets' pick for the best flea, tick, and heartworm prevention for dogs.
It is used to treat a variety of internal nematode infections, including Onchocerciasis, Strongyloidiasis, Ascariasis, cutaneous larva migrans, filariases, Gnathostomiasis and Trichuriasis, as well as for oral treatment of ectoparasitic infections, such as Pediculosis (lice infestation) and scabies (mite infestation).