Underdose after Omeprazole in horses

The FDA has received 26 reports of underdose in horses after Omeprazole. That is 1.3% of all reports for this medicine, compared with 0.8% across reports for all horse medicines, so it is reported unusually often with this medicine.

26Reports

46%Marked serious

19%Recovered

0.0%Died or euthanised

28 daysTypical onset

How soon it started

Same day

4 24%

1–2 days

3 18%

3–7 days

1 5.9%

1–4 weeks

4 24%

Over a month

5 29%

How the animals did

Recovered

5 19%

Still unwell when reported

7 27%

Not known

14 54%

Problems reported at the same time

Didn't work as expected

25 96%

3 12%

3 12%

3 12%

2 7.7%

2 7.7%

Inappropriate schedule of drug administration

2 7.7%

Systemic disorder

1 3.8%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Omeprazole cause underdose in horses?: 26 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 28 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).

Underdose with similar medicines

Underdose after Detomidine 57 reports · 5.8% of its reports
Underdose after Butorphanol 31 reports · 10% of its reports

All reported side effects of Omeprazole in horses · Medicines most reported with underdose