Hair loss after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) in cats

395 reports to the FDA describe hair loss in cats given Eprinomectin + Esafoxolaner + Praziquantel. That is 12% of all reports for this medicine, compared with 14% across reports for all cat medicines.

395Reports
1.3%Marked serious
11%Recovered
0.5%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
77 20%
1–2 days
156 41%
3–7 days
85 22%
1–4 weeks
55 14%
Over a month
10 2.6%

How the animals did

Recovered
44 11%
Recovered with lasting effects
1 0.3%
Still unwell when reported
45 11%
Died
1 0.3%
Euthanised
1 0.3%
Not known
303 77%

Problems reported at the same time

Age of the animals

Under 1 year
32
1–3 years
105
4–7 years
112
8–11 years
78
12+ years
46

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 hair loss in cats?
395 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 2 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).

Hair loss with similar medicines

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