Hiding after Fluralaner (Bravecto) in cats

305 reports to the FDA describe hiding in cats given Fluralaner. That is 2.9% of all reports for this medicine, compared with 2.4% across reports for all cat medicines.

305Reports
66%Marked serious
30%Recovered
6.6%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
158 61%
1–2 days
53 20%
3–7 days
20 7.7%
1–4 weeks
12 4.6%
Over a month
17 6.5%

How the animals did

Recovered
89 29%
Recovered with lasting effects
2 0.7%
Still unwell when reported
162 53%
Died
11 3.6%
Euthanised
9 3.0%
Not known
32 10%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
77
4–7 years
86
8–11 years
73
12+ years
56

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 hiding in cats?
305 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).

Hiding with similar medicines

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