Collapse after Lufenuron + Milbemycin Oxime (Sentinel) in dogs

The FDA has received 106 reports of collapse in dogs after Lufenuron + Milbemycin Oxime. That is 0.4% of all reports for this medicine, compared with 0.9% across reports for all dog medicines, so it is reported less often than average with this medicine.

106Reports
52%Marked serious
29%Recovered
24%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
19 50%
1–2 days
4 11%
3–7 days
2 5.3%
1–4 weeks
2 5.3%
Over a month
11 29%

How the animals did

Recovered
29 27%
Recovered with lasting effects
2 1.9%
Still unwell when reported
9 8.5%
Died
22 21%
Euthanised
3 2.8%
Not known
41 39%

Problems reported at the same time

Age of the animals

Under 1 year
13
1–3 years
29
4–7 years
26
8–11 years
25
12+ years
11

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 collapse in dogs?
106 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 1 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).

Collapse with similar medicines

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