Lethargy after Alfaxalone in cats

The FDA has received 42 reports of lethargy in cats after Alfaxalone. That is 8.9% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported less often than average with this medicine.

42Reports
64%Marked serious
17%Recovered
21%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
21 51%
1–2 days
14 34%
3–7 days
5 12%
1–4 weeks
1 2.4%
Over a month
0 0.0%

How the animals did

Recovered
7 17%
Still unwell when reported
20 48%
Died
1 2.4%
Euthanised
8 19%
Not known
6 14%

Problems reported at the same time

Hyperphosphataemia
10 24%
9 21%
9 21%

Age of the animals

Under 1 year
4
1–3 years
3
4–7 years
9
8–11 years
13
12+ years
11

About this medicine

Type: medicine.

Questions owners ask

Can Alfaxalone cause lethargy in cats?
42 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 the same 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).

Lethargy with similar medicines

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