Loss of appetite after Lufenuron in cats

The FDA has received 207 reports of loss of appetite in cats after Lufenuron. That is 19% of all reports for this medicine, compared with 14% across reports for all cat medicines.

207Reports
4.3%Marked serious
4.3%Recovered
11%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
4 36%
1–2 days
1 9.1%
3–7 days
2 18%
1–4 weeks
1 9.1%
Over a month
3 27%

How the animals did

Recovered
8 3.9%
Recovered with lasting effects
1 0.5%
Still unwell when reported
7 3.4%
Died
22 11%
Euthanised
1 0.5%
Not known
168 81%

Problems reported at the same time

Age of the animals

Under 1 year
17
1–3 years
57
4–7 years
52
8–11 years
33
12+ years
42

About this medicine

Lufenuron stops flea eggs from developing.

Questions owners ask

Can Lufenuron cause loss of appetite in cats?
207 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 3 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).

Loss of appetite with similar medicines

All reported side effects of Lufenuron in cats · Medicines most reported with loss of appetite