Drug dose administration interval too short after Fluralaner + Moxidectin (Bravecto Plus) in cats

24 reports to the FDA describe drug dose administration interval too short in cats given Fluralaner + Moxidectin. That is 0.7% of all reports for this medicine, compared with 0.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

24Reports
13%Marked serious
8.3%Recovered
0.0%Died or euthanised
99 daysTypical onset
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How soon it started

Same day
1 9.1%
1–2 days
0 0.0%
3–7 days
0 0.0%
1–4 weeks
0 0.0%
Over a month
10 91%

How the animals did

Recovered
2 8.3%
Still unwell when reported
22 92%

Problems reported at the same time

Age of the animals

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

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 drug dose administration interval too short in cats?
24 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 99 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).

Drug dose administration interval too short with similar medicines

All reported side effects of Fluralaner + Moxidectin in cats · Medicines most reported with drug dose administration interval too short