Swelling after Lotilaner (Credelio) in dogs

The FDA has received 200 reports of swelling in dogs after Lotilaner. That is 2.0% of all reports for this medicine, compared with 2.8% across reports for all dog medicines.

200Reports
27%Marked serious
49%Recovered
4.0%Died or euthanised
28 daysTypical onset
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How soon it started

Same day
44 28%
1–2 days
10 6.4%
3–7 days
5 3.2%
1–4 weeks
21 13%
Over a month
77 49%

How the animals did

Recovered
97 49%
Still unwell when reported
46 23%
Died
6 3.0%
Euthanised
2 1.0%
Not known
49 25%

Problems reported at the same time

Age of the animals

Under 1 year
52
1–3 years
91
4–7 years
34
8–11 years
18
12+ years
5

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 swelling in dogs?
200 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 28 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).

Swelling with similar medicines

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