Vomiting after Lysine in cats

25 reports to the FDA describe vomiting in cats given Lysine. That is 23% of all reports for this medicine, compared with 18% across reports for all cat medicines.

25Reports
40%Marked serious
20%Recovered
8.0%Died or euthanised
11 daysTypical onset
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How soon it started

Same day
7 35%
1–2 days
2 10%
3–7 days
1 5.0%
1–4 weeks
5 25%
Over a month
5 25%

How the animals did

Recovered
5 20%
Still unwell when reported
10 40%
Died
1 4.0%
Euthanised
1 4.0%
Not known
8 32%

Problems reported at the same time

Weight loss
4 16%
Seizures
3 12%
Death
2 8.0%
Liver problems
2 8.0%
Behaviour change
2 8.0%

Age of the animals

Under 1 year
4
1–3 years
5
4–7 years
5
8–11 years
6
12+ years
3

About this medicine

Type: medicine.

Questions owners ask

Can Lysine cause vomiting in cats?
25 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 11 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).

Vomiting with similar medicines

All reported side effects of Lysine in cats · Medicines most reported with vomiting