Amoxicillin + Clavulanate (Clavamox) side effects in cats

2,387 reports sent to the FDA between 1995 and 2026 involve Amoxicillin + Clavulanate in cats. The most reported problems were vomiting, loss of appetite, lethargy. 25% were marked serious, and where it was recorded, signs eased after stopping the medicine in 62% of cases.

2,387Reports
25%Marked serious
57%Only medicine involved
11%Recovered
16%Died or euthanised
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About this medicine

Amoxicillin treats bacterial infections.

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

Most reported side effects

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.

Didn't stop fleas
6 0.3%
Didn't stop mites
2 0.1%
Didn't stop worms
2 0.1%
Didn't stop ticks
1 0.0%

How soon problems started

Same day
317 27%
1–2 days
231 20%
3–7 days
257 22%
1–4 weeks
233 20%
Over a month
138 12%

Time from the first dose to the first sign, where both dates were reported (1,176 reports).

How the animals did

Recovered
259 11%
Recovered with lasting effects
5 0.2%
Still unwell when reported
488 20%
Died
270 11%
Euthanised
110 4.6%
Not known
1,255 53%

Breeds named most often

Popular breeds appear more often because there are more of them.

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