Tremors after Lotilaner (Credelio) in dogs

The FDA has received 496 reports of tremors in dogs after Lotilaner. That is 5.0% of all reports for this medicine, compared with 3.4% across reports for all dog medicines.

496Reports
34%Marked serious
39%Recovered
4.6%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
153 35%
1–2 days
76 18%
3–7 days
35 8.1%
1–4 weeks
49 11%
Over a month
121 28%

How the animals did

Recovered
189 38%
Recovered with lasting effects
2 0.4%
Still unwell when reported
181 36%
Died
10 2.0%
Euthanised
13 2.6%
Not known
101 20%

Problems reported at the same time

Age of the animals

Under 1 year
121
1–3 years
139
4–7 years
103
8–11 years
66
12+ years
52

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 tremors in dogs?
496 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 2 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).

Tremors with similar medicines

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