Death after Lufenuron + Milbemycin Oxime (Sentinel) in dogs

545 reports to the FDA describe death in dogs given Lufenuron + Milbemycin Oxime. That is 2.1% of all reports for this medicine, compared with 5.2% across reports for all dog medicines, so it is reported less often than average with this medicine.

545Reports
55%Marked serious
0.2%Recovered
99%Died or euthanised
8 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
37 26%
1–2 days
26 19%
3–7 days
7 5.0%
1–4 weeks
21 15%
Over a month
49 35%

How the animals did

Recovered
1 0.2%
Died
374 69%
Euthanised
165 30%
Not known
5 0.9%

Problems reported at the same time

Age of the animals

Under 1 year
62
1–3 years
69
4–7 years
107
8–11 years
178
12+ years
100

About this medicine

Lufenuron stops flea eggs from developing. Milbemycin Oxime prevents heartworm and controls some intestinal worms (monthly).

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

Questions owners ask

Can Lufenuron + Milbemycin Oxime cause death in dogs?
545 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 8 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).

Death with similar medicines

All reported side effects of Lufenuron + Milbemycin Oxime in dogs · Medicines most reported with death