Lethargy after Frunevetmab (Solensia) in cats

The FDA has received 852 reports of lethargy in cats after Frunevetmab. That is 11% of all reports for this medicine, compared with 14% across reports for all cat medicines.

852Reports

67%Marked serious

20%Recovered

21%Died or euthanised

2 daysTypical onset

How soon it started

Same day

263 33%

1–2 days

174 22%

3–7 days

93 12%

1–4 weeks

116 14%

Over a month

157 20%

How the animals did

Recovered

174 20%

Still unwell when reported

436 51%

Died

49 5.8%

Euthanised

128 15%

Not known

65 7.6%

Problems reported at the same time

488 57%

261 31%

177 21%

136 16%

133 16%

94 11%

90 11%

83 9.7%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

120

12+ years

645

About this medicine

Frunevetmab reduces osteoarthritis pain in cats (monthly injection).

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

Questions owners ask

Can Frunevetmab cause lethargy in cats?: 852 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 2 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).

All reported side effects of Frunevetmab in cats · Medicines most reported with lethargy