Nt - abnormal necropsy finding after Afoxolaner (NexGard) in dogs

The FDA has received 45 reports of nt - abnormal necropsy finding in dogs after Afoxolaner. That is 0.1% of all reports for this medicine, compared with 0.1% across reports for all dog medicines.

45Reports
100%Marked serious
0.0%Recovered
100%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
9 26%
1–2 days
13 38%
3–7 days
3 8.8%
1–4 weeks
3 8.8%
Over a month
6 18%

How the animals did

Died
36 80%
Euthanised
9 20%

Problems reported at the same time

Age of the animals

Under 1 year
6
1–3 years
9
4–7 years
12
8–11 years
11
12+ years
7

About this medicine

Afoxolaner kills fleas and ticks; given as a monthly chewable.

Products with this ingredient include NexGard. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

In 2018 the FDA alerted owners and vets that isoxazoline products have been associated with neurologic reactions such as muscle tremors, wobbliness (ataxia) and seizures, including in animals with no history of them.

Questions owners ask

Can Afoxolaner cause nt - abnormal necropsy finding in dogs?
45 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?
In half of the reports with dates, it started within 1 day of the first dose.
What should I do?
Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Nt - abnormal necropsy finding with similar medicines

All reported side effects of Afoxolaner in dogs · Medicines most reported with nt - abnormal necropsy finding