Malaise after Lotilaner (Credelio) in dogs

The FDA has received 94 reports of malaise in dogs after Lotilaner. That is 0.9% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

94Reports
28%Marked serious
40%Recovered
5.3%Died or euthanised
7 daysTypical onset
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How soon it started

Same day
21 30%
1–2 days
8 11%
3–7 days
14 20%
1–4 weeks
4 5.6%
Over a month
24 34%

How the animals did

Recovered
38 40%
Still unwell when reported
25 27%
Died
1 1.1%
Euthanised
4 4.3%
Not known
26 28%

Problems reported at the same time

Age of the animals

Under 1 year
25
1–3 years
16
4–7 years
25
8–11 years
19
12+ years
8

About this medicine

Lotilaner kills fleas and ticks; monthly chewable.

Products with this ingredient include Credelio. 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 Lotilaner cause malaise in dogs?
94 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 7 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).

Malaise with similar medicines

All reported side effects of Lotilaner in dogs · Medicines most reported with malaise