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

533 reports to the FDA describe lethargy in cats given Eprinomectin + Esafoxolaner + Praziquantel. That is 16% of all reports for this medicine, compared with 14% across reports for all cat medicines.

533Reports
25%Marked serious
35%Recovered
14%Died or euthanised
Same dayTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
261 50%
1–2 days
163 31%
3–7 days
51 9.8%
1–4 weeks
35 6.7%
Over a month
10 1.9%

How the animals did

Recovered
184 35%
Still unwell when reported
50 9.4%
Died
36 6.8%
Euthanised
39 7.3%
Not known
224 42%

Problems reported at the same time

143 27%
72 14%
60 11%
57 11%
54 10%
52 9.8%

Age of the animals

Under 1 year
110
1–3 years
161
4–7 years
105
8–11 years
78
12+ years
64

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 lethargy in cats?
533 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).

Lethargy with similar medicines

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