Abnormal menace reflex test after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) in cats

36 reports to the FDA describe abnormal menace reflex test in cats given Eprinomectin + Esafoxolaner + Praziquantel. That is 1.1% of all reports for this medicine, compared with 0.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

36Reports
83%Marked serious
22%Recovered
47%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
18 55%
1–2 days
13 39%
3–7 days
2 6.1%
1–4 weeks
0 0.0%
Over a month
0 0.0%

How the animals did

Recovered
7 19%
Recovered with lasting effects
1 2.8%
Still unwell when reported
7 19%
Died
1 2.8%
Euthanised
16 44%
Not known
4 11%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
20
4–7 years
4
8–11 years
2
12+ years
1

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 abnormal menace reflex test in cats?
36 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).

Abnormal menace reflex test with similar medicines

All reported side effects of Eprinomectin + Esafoxolaner + Praziquantel in cats · Medicines most reported with abnormal menace reflex test