Loss of appetite after Sarolaner + Selamectin (Revolution Plus) in cats

The FDA has received 874 reports of loss of appetite in cats after Sarolaner + Selamectin. That is 11% of all reports for this medicine, compared with 14% across reports for all cat medicines.

874Reports
49%Marked serious
20%Recovered
6.5%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
361 43%
1–2 days
285 34%
3–7 days
109 13%
1–4 weeks
57 6.7%
Over a month
37 4.4%

How the animals did

Recovered
179 20%
Still unwell when reported
420 48%
Died
26 3.0%
Euthanised
31 3.5%
Not known
218 25%

Problems reported at the same time

Age of the animals

Under 1 year
112
1–3 years
226
4–7 years
172
8–11 years
168
12+ years
143

About this medicine

Sarolaner kills fleas, ticks and some mites; monthly. Selamectin prevents heartworm and treats fleas, ear mites and some worms (spot-on).

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

In 2018 the FDA alerted owners and vets that isoxazoline products have been associated with neurologic reactions such as muscle tremors, wobbliness (ataxia) and seizures, including in animals with no history of them.

Questions owners ask

Can Sarolaner + Selamectin cause loss of appetite in cats?
874 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 Sarolaner + Selamectin in cats · Medicines most reported with loss of appetite