Didn't work as expected after Altrenogest Oily in horses

The FDA has received 36 reports of didn't work as expected in horses after Altrenogest Oily. That is 48% of all reports for this medicine, compared with 23% across reports for all horse medicines, so it is reported unusually often with this medicine.

36Reports

53%Marked serious

19%Recovered

2.8%Died or euthanised

3 daysTypical onset

How soon it started

Same day

3 27%

1–2 days

2 18%

3–7 days

1 9.1%

1–4 weeks

0 0.0%

Over a month

5 45%

How the animals did

Recovered

6 17%

Recovered with lasting effects

1 2.8%

Still unwell when reported

21 58%

Died

1 2.8%

Not known

7 19%

Problems reported at the same time

Drug administration duration too long

9 25%

Overdose

6 17%

Underdose

3 8.3%

Vocalising

2 5.6%

Behaviour change

2 5.6%

Swelling

2 5.6%

Mammary gland disorder

2 5.6%

Female reproductive tract disorder

2 5.6%

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 Altrenogest Oily cause didn't work as expected in horses?: 36 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 3 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).

Didn't work as expected with similar medicines

Didn't work as expected after Omeprazole 1,708 reports · 88% of its reports
Didn't work as expected after Pergolide 143 reports · 12% of its reports
Didn't work as expected after Ceftiofur 64 reports · 5.3% of its reports
Didn't work as expected after Detomidine 306 reports · 31% of its reports
Didn't work as expected after Flunixin Meglumine 46 reports · 7.4% of its reports
Didn't work as expected after Ketamine 463 reports · 82% of its reports
Didn't work as expected after Polysulfated Glycosaminoglycan 40 reports · 7.8% of its reports
Didn't work as expected after Xylazine 268 reports · 58% of its reports
Didn't work as expected after Sucralfate 384 reports · 98% of its reports
Didn't work as expected after Butorphanol 84 reports · 28% of its reports

All reported side effects of Altrenogest Oily in horses · Medicines most reported with didn't work as expected