Eye or vision problems after Fluralaner + Moxidectin (Bravecto Plus) in cats

The FDA has received 21 reports of eye or vision problems in cats after Fluralaner + Moxidectin. That is 0.6% of all reports for this medicine, compared with 2.3% across reports for all cat medicines, so it is reported less often than average with this medicine.

21Reports
81%Marked serious
62%Recovered
0.0%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
4 25%
1–2 days
7 44%
3–7 days
1 6.3%
1–4 weeks
4 25%
Over a month
0 0.0%

How the animals did

Recovered
5 24%
Recovered with lasting effects
8 38%
Still unwell when reported
6 29%
Not known
2 9.5%

Problems reported at the same time

Abnormal menace reflex test
5 24%
4 19%

Age of the animals

Under 1 year
3
1–3 years
8
4–7 years
3
8–11 years
6
12+ years
1

About this medicine

Fluralaner kills fleas and ticks for up to 12 weeks (chewable or spot-on). Moxidectin prevents heartworm disease (monthly topical, or a 6- or 12-month injection for dogs).

Products with this combination include Bravecto Plus. 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 + Moxidectin cause eye or vision problems in cats?
21 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).

Eye or vision problems with similar medicines

All reported side effects of Fluralaner + Moxidectin in cats · Medicines most reported with eye or vision problems