Overdose after Fluralaner (Bravecto) in cats

138 reports to the FDA describe overdose in cats given Fluralaner. That is 1.3% of all reports for this medicine, compared with 0.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

138Reports
57%Marked serious
13%Recovered
3.6%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
42 48%
1–2 days
14 16%
3–7 days
7 8.0%
1–4 weeks
8 9.2%
Over a month
16 18%

How the animals did

Recovered
18 13%
Still unwell when reported
109 79%
Euthanised
5 3.6%
Not known
6 4.3%

Problems reported at the same time

Age of the animals

Under 1 year
13
1–3 years
39
4–7 years
40
8–11 years
20
12+ years
23

About this medicine

Fluralaner kills fleas and ticks for up to 12 weeks (chewable or spot-on).

Products with this ingredient include Bravecto. 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 Fluralaner cause overdose in cats?
138 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).

Overdose with similar medicines

All reported side effects of Fluralaner in cats · Medicines most reported with overdose