Fluralaner (Bravecto) side effects in cats
10,635 reports sent to the FDA between 2014 and 2026 involve Fluralaner in cats. The most reported problems were hair loss, application site reaction, lethargy. 54% were marked serious, and where it was recorded, signs eased after stopping the medicine in 88% of cases.
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.
Most reported side effects
Share = percentage of this medicine's reports that mention the problem. One report can list several problems.
Reports that it didn't work
Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.
How soon problems started
Time from the first dose to the first sign, where both dates were reported (7,203 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 6,471 reports
- Domestic Longhair 1,000 reports
- Domestic Mediumhair 742 reports
- Siamese 210 reports
- Maine Coon 188 reports
- Persian 102 reports
- Ragdoll 74 reports
- Bengal 67 reports
- Cat (other) 61 reports
- Russian 56 reports