Loss of appetite after Lufenuron + Milbemycin Oxime (Sentinel) in dogs

The FDA has received 1,500 reports of loss of appetite in dogs after Lufenuron + Milbemycin Oxime. That is 5.8% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

1,500Reports
40%Marked serious
31%Recovered
9.1%Died or euthanised
1 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
222 31%
1–2 days
191 27%
3–7 days
49 6.9%
1–4 weeks
91 13%
Over a month
158 22%

How the animals did

Recovered
450 30%
Recovered with lasting effects
13 0.9%
Still unwell when reported
211 14%
Died
81 5.4%
Euthanised
55 3.7%
Not known
690 46%

Problems reported at the same time

829 55%
725 48%
478 32%
133 8.9%
128 8.5%
113 7.5%

Age of the animals

Under 1 year
234
1–3 years
400
4–7 years
399
8–11 years
306
12+ years
146

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 loss of appetite in dogs?
1,500 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).

Loss of appetite with similar medicines

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