Drooling after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) in cats

The FDA has received 511 reports of drooling in cats after Eprinomectin + Esafoxolaner + Praziquantel. That is 16% of all reports for this medicine, compared with 5.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

511Reports
13%Marked serious
46%Recovered
6.8%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
434 86%
1–2 days
49 9.7%
3–7 days
12 2.4%
1–4 weeks
4 0.8%
Over a month
5 1.0%

How the animals did

Recovered
234 46%
Still unwell when reported
13 2.5%
Died
15 2.9%
Euthanised
20 3.9%
Not known
229 45%

Problems reported at the same time

Age of the animals

Under 1 year
116
1–3 years
156
4–7 years
92
8–11 years
49
12+ years
27

About this medicine

Eprinomectin controls worms and prevents heartworm. Esafoxolaner kills fleas and ticks (spot-on for cats). Praziquantel treats tapeworms.

Products with this combination include NexGard Combo. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Some herding breeds (for example Collies) carry the MDR1 gene variant and can be more sensitive to this drug class at high doses.

Questions owners ask

Can Eprinomectin + Esafoxolaner + Praziquantel cause drooling in cats?
511 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 the same day 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).

Drooling with similar medicines

All reported side effects of Eprinomectin + Esafoxolaner + Praziquantel in cats · Medicines most reported with drooling