Vomiting after Lactulose in cats

The FDA has received 40 reports of vomiting in cats after Lactulose. That is 20% of all reports for this medicine, compared with 18% across reports for all cat medicines.

40Reports
53%Marked serious
33%Recovered
15%Died or euthanised
21 daysTypical onset
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How soon it started

Same day
7 20%
1–2 days
1 2.9%
3–7 days
3 8.6%
1–4 weeks
8 23%
Over a month
16 46%

How the animals did

Recovered
13 33%
Still unwell when reported
13 33%
Died
2 5.0%
Euthanised
4 10%
Not known
8 20%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
1
4–7 years
5
8–11 years
6
12+ years
27

About this medicine

Type: medicine.

Questions owners ask

Can Lactulose cause vomiting in cats?
40 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 21 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 Lactulose in cats · Medicines most reported with vomiting