Preventic Side Effects

By Genevieve Rice


Preventic is a plastic tick collar for dogs that slowly releases Amitraz, an anti-parasitic drug. Effective for up to three months, the collar repels new ticks and, according to studies, prevents the transmission of Lyme disease. Although Preventic has been reported to be more than 97 percent effective, its active ingredient, Amitraz, can be toxic to some dogs, producing some undesirable side effects. Dog owners should consult with their veterinarians if they notice the following side effects or any other abnormalities.


For 24 hours after applying the collar, mild sedation is a common, short-term side effect of Amitraz in dogs. However, if drowsiness persists for more than 72 hours or progresses to more serious symptoms such as an unsteady gait or listlessness, remove the collar immediately and consult your veterinarian.

Diarrhea, Vomiting and Loss of Appetite

Dogs having a toxic reaction to Amitraz may also experience diarrhea, vomiting and loss of appetite. Again, dog owners should remove the Preventic collar and consult with a veterinarian for further medical instructions.

Blood Sugar Effects

Amitraz has been shown to affect blood sugar in some canines. Please do not use Preventic if your dog is diabetic. In the same measure, diabetic humans should avoid handling the product directly, by wearing plastic gloves while attaching the collar.

Allergic Reaction

Some dogs are hypersensitive to Amitraz and can experience an allergic reaction, including skin irritation, hives and swelling. These reactions can be treated with yohimbine, which counteracts the level of toxicity and, in turn, reduces allergy effects. However, if these symptoms persist, discontinuing use of Preventic is highly recommended.


Preventic is designed to prevent ticks in dogs only; please do not use on cats. Although Preventic can be used safely on most dogs, it is not intended for dogs younger than 4 months or that weigh less than 20 pounds. Also, please discuss Preventic with your veterinarian before using on dogs that are currently taking other medications, as Amitraz may react with other drugs. Do not apply Preventic to pregnant or lactating dogs; high levels of Amitraz in breast milk can poison puppies. Furthermore, do not let your dog chew on the collar; if ingested, Amitraz can be toxic.
Comments (0)
Be the first to comment!
Any inappropriate content? Tell DailyPuppy!

Puppy Up Your Blog

Daily Puppy WidgetBox Widget Get this widget from Widgetbox