Didn't stop worms after Fluralaner (Bravecto) in dogs

629 reports to the FDA describe didn't stop worms in dogs given Fluralaner. That is 0.9% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

629Reports

36%Marked serious

5.4%Recovered

0.3%Died or euthanised

80 daysTypical onset

How soon it started

Same day

14 5.5%

1–2 days

4 1.6%

3–7 days

12 4.7%

1–4 weeks

37 15%

Over a month

187 74%

How the animals did

Recovered

29 4.6%

Recovered with lasting effects

5 0.8%

Still unwell when reported

269 43%

Died

1 0.2%

Euthanised

1 0.2%

Not known

324 52%

Problems reported at the same time

Didn't work as expected

46 7.3%

38 6.0%

33 5.2%

27 4.3%

16 2.5%

14 2.2%

13 2.1%

10 1.6%

Age of the animals

Under 1 year

1–3 years

198

4–7 years

170

8–11 years

12+ years

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 didn't stop worms in dogs?: 629 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 80 days 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).

Didn't stop worms with similar medicines

Didn't stop worms after Afoxolaner (NexGard) 1,124 reports · 2.0% of its reports
Didn't stop worms after Sarolaner (Simparica) 388 reports · 2.3% of its reports
Didn't stop worms after Lotilaner (Credelio) 552 reports · 5.5% of its reports
Didn't stop worms after Afoxolaner + Moxidectin + Pyrantel (NexGard PLUS) 2,103 reports · 23% of its reports
Didn't stop worms after Lotilaner + Moxidectin + Praziquantel + Pyrantel (Credelio Quattro) 335 reports · 11% of its reports

All reported side effects of Fluralaner in dogs · Medicines most reported with didn't stop worms