Hyperphosphataemia after Lufenuron + Milbemycin Oxime (Sentinel) in dogs

The FDA has received 49 reports of hyperphosphataemia in dogs after Lufenuron + Milbemycin Oxime. That is 0.2% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported less often than average with this medicine.

49Reports
53%Marked serious
8.2%Recovered
33%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
11 46%
1–2 days
1 4.2%
3–7 days
2 8.3%
1–4 weeks
2 8.3%
Over a month
8 33%

How the animals did

Recovered
3 6.1%
Recovered with lasting effects
1 2.0%
Still unwell when reported
11 22%
Died
9 18%
Euthanised
7 14%
Not known
18 37%

Problems reported at the same time

Age of the animals

Under 1 year
16
1–3 years
5
4–7 years
9
8–11 years
16
12+ years
3

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 hyperphosphataemia in dogs?
49 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).

Hyperphosphataemia with similar medicines

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