Dog Owners Link 965 Deaths to Flea Killer and Heatworm Preventive, Trifexis

Despite pet owner claims, Elanco Animal Health and the FDA say Trifexis is safe.

By | Posted: August 5, 2014, 10 a.m. PST

Trifexis, a flea killer and heartworm preventive introduced in 2011, is being blamed for nearly 1,000 dog deaths, but both the manufacturer and the U.S. Food and Drug Administration cautioned that no evidence has been found tying the drug to the claims.

Atlanta television station WSB learned after filing a Freedom of Information Act request that the FDA had received 965 complaints of Trifexis-related dog deaths. Pet owners have debated the drug’s safety on multiple websites and even started a Facebook page called Does Trifexis Kill Dogs? The page has over 5,000 followers to date.

Anit Trifexes Facebook Group

FDA, which approves and regulates human and animal drugs, acknowledged that dog owners and veterinarians have lodged formal complaints about Trifexis (spinosad and milbemycin oxime).

"FDA is aware of adverse event reports in connection with Trifexis and continues to closely monitor them,” the agency reports in a prepared statement. "It is very important to realize that reports of adverse events do not necessarily mean that the product caused the event. Other factors, such as existing disease, exposure to chemicals or contaminants, foods, or other medications may have triggered or contributed to the cause of the event.”




WSB-TV also reported in late July that 1,500 Trifexis complaints were related to ataxia, the loss of muscle control.

The drug’s manufacturer, Elanco Animal Health of Greenfield, Ind., in March 2012 added ataxia and seizures to the list of reported adverse reactions. The drug’s initial approval noted mild side effects such as vomiting, itching, lethargy and diarrhea.

Elanco states that 70 million doses of Trifexis have been dispensed and that "no established link” has been found between the drug and canine deaths.

Trifexis, a beef-flavored chewable tablet, is available in five dosages based on a dog’s weight. The drug is indicated to prevent and treat flea infestations, prevent heartworm disease, and treat and control adult hookworms, roundworms and whipworms.

Dog owners should raise any concerns about Trifexis with their veterinarian, FDA spokeswoman Megan Bensette says.

"We encourage pet owners who have had problems they believe are attributable to any FDA-regulated products to work with their veterinarians to file a report with the agency,” Bensette says.

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rod   los angeles, California

5/20/2015 7:06:45 PM

My Belgian Shepherd lived most of his life with near immortal power, his strength, speed and resilience have amazed though who have seen him. Two and a half weeks after administering trifexis a dog that had a vertical leap higher than Kobe Bryant could hardly get into a car. Realizing at that point that there was something amiss I researched and found that Trifexis was indeed the culprit. After consulting with the lead veterinarian at that company, despite her sympathetic approach, I was aware that there was no known antidote for what was taking place. Within a day, with the help of a few brilliant homeopaths, I put Achilles on Milk thistle, dandelion oil and an amazing product from BIOAGE that has been developed for animals. In just three days the symptoms started to reverse and in three weeks he had returned to health. I believe that this criteria will work in reversing this terrible condition

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