Pain after Afoxolaner (NexGard) in dogs

264 reports to the FDA describe pain in dogs given Afoxolaner. That is 0.5% of all reports for this medicine, compared with 0.7% across reports for all dog medicines, so it is reported less often than average with this medicine.

264Reports
58%Marked serious
23%Recovered
13%Died or euthanised
1 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
79 37%
1–2 days
46 22%
3–7 days
21 9.9%
1–4 weeks
18 8.5%
Over a month
48 23%

How the animals did

Recovered
61 23%
Still unwell when reported
25 9.5%
Died
9 3.4%
Euthanised
25 9.5%
Not known
144 55%

Problems reported at the same time

Age of the animals

Under 1 year
38
1–3 years
64
4–7 years
63
8–11 years
54
12+ years
37

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 pain in dogs?
264 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).

Pain with similar medicines

All reported side effects of Afoxolaner in dogs · Medicines most reported with pain