Hypocortisolaemia after Trilostane (Vetoryl) in dogs

The FDA has received 437 reports of hypocortisolaemia in dogs after Trilostane. That is 3.7% 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.

437Reports
47%Marked serious
5.7%Recovered
4.1%Died or euthanised
89 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
13 4.3%
1–2 days
5 1.6%
3–7 days
14 4.6%
1–4 weeks
61 20%
Over a month
212 70%

How the animals did

Recovered
21 4.8%
Recovered with lasting effects
4 0.9%
Still unwell when reported
60 14%
Died
6 1.4%
Euthanised
12 2.7%
Not known
334 76%

Problems reported at the same time

Age of the animals

Under 1 year
0
1–3 years
3
4–7 years
31
8–11 years
203
12+ years
187

About this medicine

Trilostane treats Cushing's disease (an overactive adrenal gland).

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

Questions owners ask

Can Trilostane cause hypocortisolaemia in dogs?
437 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 89 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).

Hypocortisolaemia with similar medicines

All reported side effects of Trilostane in dogs · Medicines most reported with hypocortisolaemia