Unable to stand after Afoxolaner (NexGard) in dogs

286 reports to the FDA describe unable to stand in dogs given Afoxolaner. That is 0.5% of all reports for this medicine, compared with 0.3% across reports for all dog medicines.

286Reports
57%Marked serious
37%Recovered
20%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
70 30%
1–2 days
64 27%
3–7 days
34 15%
1–4 weeks
28 12%
Over a month
37 16%

How the animals did

Recovered
107 37%
Still unwell when reported
23 8.0%
Died
18 6.3%
Euthanised
40 14%
Not known
98 34%

Problems reported at the same time

Age of the animals

Under 1 year
43
1–3 years
49
4–7 years
65
8–11 years
59
12+ years
64

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 unable to stand in dogs?
286 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 2 days 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).

Unable to stand with similar medicines

All reported side effects of Afoxolaner in dogs · Medicines most reported with unable to stand