Uncomfortable after Afoxolaner (NexGard) in dogs

108 reports to the FDA describe uncomfortable in dogs given Afoxolaner. That is 0.2% of all reports for this medicine, compared with 0.1% across reports for all dog medicines.

108Reports
31%Marked serious
30%Recovered
6.5%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
50 57%
1–2 days
21 24%
3–7 days
4 4.6%
1–4 weeks
4 4.6%
Over a month
8 9.2%

How the animals did

Recovered
32 30%
Still unwell when reported
11 10%
Died
2 1.9%
Euthanised
5 4.6%
Not known
58 54%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
25
4–7 years
29
8–11 years
26
12+ years
16

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 uncomfortable in dogs?
108 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 the same 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).

Uncomfortable with similar medicines

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