https://buyivermectin24.com/pr....oduct/buy-iverjohn-6 is a safe and effective treatment for heartworm disease in dogs. However, some dogs may experience a worsening of symptoms when first starting treatment. This is due to the fact that ivermectin kills the adult heartworms, which can cause inflammation and irritation of the lungs. Most dogs will improve within a few days of starting treatment, but some may require additional supportive care such as cough suppressants or steroids. If your dog experiences a worsening of symptoms, please contact your veterinarian.