Hyperphosphataemia after Lotilaner (Credelio) in dogs

The FDA has received 44 reports of hyperphosphataemia in dogs after Lotilaner. That is 0.4% of all reports for this medicine, compared with 0.6% across reports for all dog medicines.

44Reports
75%Marked serious
9.1%Recovered
27%Died or euthanised
25 daysTypical onset
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How soon it started

Same day
7 18%
1–2 days
5 13%
3–7 days
3 7.9%
1–4 weeks
6 16%
Over a month
17 45%

How the animals did

Recovered
4 9.1%
Still unwell when reported
16 36%
Died
5 11%
Euthanised
7 16%
Not known
12 27%

Problems reported at the same time

Age of the animals

Under 1 year
28
1–3 years
6
4–7 years
3
8–11 years
4
12+ years
3

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 hyperphosphataemia in dogs?
44 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 25 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).

Hyperphosphataemia with similar medicines

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