Swelling after Sarolaner + Selamectin (Revolution Plus) in cats

88 reports to the FDA describe swelling in cats given Sarolaner + Selamectin. That is 1.1% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported less often than average with this medicine.

88Reports
66%Marked serious
24%Recovered
11%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
40 50%
1–2 days
24 30%
3–7 days
12 15%
1–4 weeks
2 2.5%
Over a month
2 2.5%

How the animals did

Recovered
21 24%
Still unwell when reported
36 41%
Died
7 8.0%
Euthanised
3 3.4%
Not known
21 24%

Problems reported at the same time

Age of the animals

Under 1 year
20
1–3 years
16
4–7 years
26
8–11 years
7
12+ years
12

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 swelling in cats?
88 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).

Swelling with similar medicines

All reported side effects of Sarolaner + Selamectin in cats · Medicines most reported with swelling