Tarry or black stool after Lokivetmab (Cytopoint) in dogs

24 reports to the FDA describe tarry or black stool in dogs given Lokivetmab. That is 0.4% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

24Reports

54%Marked serious

17%Recovered

13%Died or euthanised

6 daysTypical onset

How soon it started

Same day

3 15%

1–2 days

4 20%

3–7 days

5 25%

1–4 weeks

3 15%

Over a month

5 25%

How the animals did

Recovered

4 17%

Still unwell when reported

15 63%

Died

3 13%

Not known

2 8.3%

Problems reported at the same time

18 75%

14 58%

9 38%

8 33%

Didn't work as expected

5 21%

Swelling

3 13%

Death

3 13%

Liver problems

3 13%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Lokivetmab controls allergic itch for 4–8 weeks per injection.

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

Questions owners ask

Can Lokivetmab cause tarry or black stool in dogs?: 24 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 6 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).

Tarry or black stool with similar medicines

Tarry or black stool after Bedinvetmab (Librela) 53 reports · 0.3% of its reports

All reported side effects of Lokivetmab in dogs · Medicines most reported with tarry or black stool