Tremors after Fluralaner (Bravecto) in dogs

The FDA has received 2,377 reports of tremors in dogs after Fluralaner. That is 3.5% of all reports for this medicine, compared with 3.4% across reports for all dog medicines.

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How soon it started

How the animals did

Problems reported at the same time

Age of the animals

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 tremors in dogs?

2,377 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).

Tremors with similar medicines

• Tremors after Afoxolaner (NexGard) 2,689 reports · 4.7% of its reports
• Tremors after Sarolaner (Simparica) 2,370 reports · 14% of its reports
• Tremors after Lotilaner (Credelio) 496 reports · 5.0% of its reports
• Tremors after Afoxolaner + Moxidectin + Pyrantel (NexGard PLUS) 347 reports · 3.7% of its reports
• Tremors after Lotilaner + Moxidectin + Praziquantel + Pyrantel (Credelio Quattro) 129 reports · 4.2% of its reports

All reported side effects of Fluralaner in dogs · Medicines most reported with tremors