Appetite loss after Fluralaner (Bravecto) in cats

40 reports to the FDA describe appetite loss in cats given Fluralaner. That is 0.4% of all reports for this medicine, compared with 0.3% across reports for all cat medicines.

40Reports
53%Marked serious
33%Recovered
5.0%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
9 29%
1–2 days
17 55%
3–7 days
1 3.2%
1–4 weeks
4 13%
Over a month
0 0.0%

How the animals did

Recovered
12 30%
Recovered with lasting effects
1 2.5%
Still unwell when reported
25 63%
Died
1 2.5%
Euthanised
1 2.5%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
9
4–7 years
12
8–11 years
11
12+ years
5

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 appetite loss in cats?
40 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).

Appetite loss with similar medicines

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