Lethargy after Maropitant (Cerenia) in cats

926 reports to the FDA describe lethargy in cats given Maropitant. That is 24% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

926Reports

64%Marked serious

19%Recovered

26%Died or euthanised

1 daysTypical onset

How soon it started

Same day

315 38%

1–2 days

215 26%

3–7 days

115 14%

1–4 weeks

107 13%

Over a month

83 9.9%

How the animals did

Recovered

174 19%

Still unwell when reported

327 35%

Died

109 12%

Euthanised

135 15%

Not known

181 20%

Problems reported at the same time

584 63%

342 37%

241 26%

198 21%

171 18%

160 17%

156 17%

143 15%

Age of the animals

Under 1 year

1–3 years

134

4–7 years

195

8–11 years

211

12+ years

270

About this medicine

Maropitant prevents vomiting and motion sickness.

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

Questions owners ask

Can Maropitant cause lethargy in cats?: 926 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 1 day 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).

Lethargy with similar medicines

Lethargy after Mirtazapine (Mirataz) 305 reports · 16% of its reports
Lethargy after Capromorelin (Entyce) 198 reports · 24% of its reports

All reported side effects of Maropitant in cats · Medicines most reported with lethargy