Pet Recall Facts

Ingredients / Monensin

Monensin: FDA adverse event reports for pets

Reports received through June 26, 2026. Data and limitations.

4,842Total reports
64Dog reports
0Cat reports

FDA-approved products with this ingredient (Green Book)

All approved products with this ingredient, for any species.

Brand names come only from the Green Book. Brand names in FDA's public report data are masked, so counts cannot be attributed to any brand. Ingredient names in the reports are written many ways; we group them under one ingredient name and count each report once per ingredient (method).

Reports by year received

198730
198822
198924
199017
19918
19928
199310
199429
19955
199622
199737
199842
199935
200036
200168
200298
2003160
2004212
2005308
2006191
2007188
2008193
2009166
2010152
2011169
2012185
2013243
2014206
2015244
2016248
2017203
2018242
2019155
2020156
2021151
2022141
2023131
2024116
2025131
202660

Species named in reports

Cattle3,387
Turkey399
Horse306
Chicken191
Not given130
Sheep109
Goat82
Dog64

Signs reported after Monensin

Death2,328
Anorexia620
Diarrhoea608
Accidental exposure490
Lack of efficacy (protozoa) - Coccidia483
Milk production decrease337
Recumbency334
Inappropriate preparation of medication316
Alteration of milk quality301
Decreased appetite205
Loose stool198
Not eating189
Lack of efficacy - NOS183
Ruminal bloat171
Depression163
NT - Abnormal necropsy finding NOS156
PR-HEART, LESION(S)150
Ataxia136
Death by euthanasia135
Pneumonia132
Cardiac disorder NOS130
Lethargy (see also Central nervous system depression in Neurological)115
INEFFECTIVE, COCCIDIA109
INEFFECTIVE, PRODUCTION (MILK)104
Other abnormal test result NOS99

Breeds named in reports

Holstein-Friesian also known as Holstein1,376
Cattle (unknown)814
Crossbred Bovine/Cattle604
Turkey (unknown)374
Horse (unknown)184
Aberdeen Angus171
Chicken (unknown)166
Cattle (other)149
Jersey144
Mixed (Cattle)126
Sheep (unknown)65
Quarter Horse53
Pig (unknown)43
Goat (unknown)42
Boer29

Reported outcomes

Died2,521
Outcome Unknown1,172
Recovered/Normal463
Ongoing238
Euthanized93
Recovered with Sequela90

Report a problem to FDA