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What Flea and Tick Medicine Is Killing Dogs? Certain flea and tick medicines, particularly those containing the active ingredient isoxazoline, have been reported to cause serious adverse reactions, even death, in some dogs.
These medications, while effective at killing fleas and ticks, have raised concerns due to severe side effects such as seizures, neurological issues, and more.
Understanding which products could pose risks and how to use flea and tick control safely is vital for your pet’s health and well-being.
The Danger of Isoxazoline-Based Flea and Tick Medications
Isoxazoline is a class of chemical compounds found in some popular flea and tick medications. These include well-known brands like Bravecto, NexGard, and Simparica. While these products are FDA-approved and effective in treating flea and tick infestations, reports of adverse effects have led to growing concern among pet owners and veterinarians. The isoxazoline class includes the following products, which have been linked to adverse reactions in some dogs:
- Bravecto: Used as a chewable tablet or topical solution, Bravecto is known for its long-lasting effects (up to 12 weeks).
- NexGard: A monthly chewable treatment that protects dogs from fleas and ticks.
- Simparica: Another monthly oral treatment similar to NexGard, often used to treat infestations.
While effective, these medications have been associated with neurological symptoms, such as tremors and seizures, especially in dogs with a history of such issues. For more information, read our guide to flea and tick medicine safety.
The FDA has issued warnings about isoxazoline products, stating that while they are safe for most dogs, there is a risk for neurological reactions in sensitive animals. Read more from the FDA’s safety announcement.
Reported Side Effects Isoxazoline
Dogs given flea and tick treatments that contain isoxazoline have been reported to experience a range of side effects.
These include neurological issues like seizures and tremors, as well as symptoms of lethargy and loss of coordination, which can affect the dog’s ability to move normally.
In addition, some dogs may develop gastrointestinal problems, leading to vomiting or diarrhea.
While these side effects are not common, it’s important for pet owners to monitor their pets closely and consult a veterinarian if any of these symptoms occur after administering the medication.
A study published by Veterinary Practice News highlights that while these reactions are rare, they can be severe and sometimes life-threatening in certain dogs.
