Lack of efficacy (protozoa) - Coccidia: in adverse event reports for animal drugs

Clinical sign, a VeDDRA term

In plain words: the product did not have the expected effect: coccidia.

Read this first. FDA says this about the data:

An API dataset query result cannot be used to estimate the risk associated with the product or compare one drug or device product with another. When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event. This dataset should not be the sole source of information for clinical decision-making or other assumptions about the safety or effectiveness of a product. The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources.
FDA Center for Veterinary Medicine publishes these words. Source: Adverse Event Reports for Animal Drugs and Devices, read on 2 Oct 2026. The data have the reports that FDA received through 26 Jun 2026.

This page is not veterinary advice. For an animal that is ill, speak to a veterinarian.

Contacting a veterinarian How to report to FDA

From January 1987 to June 2026, FDA received 4,984 adverse event reports for animal drugs that list this sign. That is 0.4% of the 1,378,761 reports that FDA received from January 1987 to June 2026. In the 12 months to June 2026, FDA received 177 reports that list this sign.

Of the 4,984 reports, 77.6% are about dogs. A report can list more than one sign and more than one drug. A report is not proof that a drug caused a sign.

By number of reports in all years, this sign is number 133 of 1,149 clinical signs with a page. Reports that list this sign rose by 5.4% in the 12 months to June 2026, compared with the 12 months before. Reports for all animal drugs fell by 4.6% in the same periods. The newest months can get more reports in a later update. Reports about cattle are 12.9% of the reports that list this sign, and 2.3% of all reports.

Search engines list a sign page with 3,000 reports or more in all years. The page also needs 300 reports or more in the 12 months to June 2026. This page is under one of these numbers. The site keeps the page and keeps it out of search engines.

Drug pages with reports that list this sign

The table has every drug page with 20 or more reports that list this sign, in order of name. No count decides which drug is in the table. The table has 26 drug pages.

Show the 26 drug pages

Drug pages with 20 or more reports that list this sign, in order of name
Active ingredients	Reports that list the sign
Afoxolaner	27
Afoxolaner + Moxidectin + Pyrantel Pamoate	60
Amprolium	67
Decoquinate	41
Doramectin	49
Eprinomectin	25
Febantel + Praziquantel + Pyrantel Pamoate	32
Fenbendazole	35
Imidacloprid + Moxidectin	26
Ivermectin + Praziquantel + Pyrantel Pamoate	67
Ivermectin + Pyrantel Pamoate	2,442
Lasalocid sodium	50
Lufenuron + Milbemycin Oxime	329
Lufenuron + Milbemycin Oxime + Praziquantel	27
Lufenuron + Praziquantel	37
Milbemycin Oxime	153
Milbemycin Oxime + Praziquantel	163
Milbemycin Oxime + Spinosad	139
Monensin	484
Moxidectin	87
Narasin	75
Narasin + Nicarbazin	109
Pyrantel Pamoate	25
Pyrantel Pamoate + Sarolaner	125
Selamectin	38
Sulfadimethoxine	300

The openFDA records give the value "MSK" for the brand name and for the manufacturer name of each drug. FDA says that MSK means "masked". So the site cannot count a report for a brand. A report can name more than one drug.

An API dataset query result cannot be used to estimate the risk associated with the product or compare one drug or device product with another.
The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources.
FDA Center for Veterinary Medicine. Source: Adverse Event Reports for Animal Drugs and Devices

Ingredients, all combinations

The list has every active ingredient with 20 or more reports that list this sign, in order of name. It has 23 ingredients.

Reports by species

Dog77.6%3,867
Cattle12.9%644
Chicken4.5%224
Cat3.1%153
Turkey0.9%43
Goat0.4%20

The share is of the 4,984 reports that list this sign. The sign is in 0.4% of all reports about the species dog. The sign is in 2.1% of all reports about the species cattle.

Reports by month and by year

Reports for each month, Jul 2021 to Jun 2026. The month is the month in which FDA received the report.

FDA says that a report can take 3 to 6 months to reach the public data. The newest months can get more reports in a later update.

Reports that list Lack of efficacy (protozoa) - Coccidia, by the year in which FDA received them
Year	Reports
2026	77
2025	185
2024	185
2023	204
2022	254
2021	178
2020	44
2017	453
2016	496
2015	434
2014	444
2013	492
2012	351
2011	191
2010	136
2009	142
2008	136
2007	139
2006	107
2005	66
2004	65
2003	63
2002	20
2001	20
2000	23
1999	21
1998	18
1997	7
1996	16
1995	3
1994	2
1991	2
1989	7
1987	3

What these reports record

Outcome at the time of the report

Reports with this sign
All reports

Recovered/Normal5.8%287, All reports: 20.7%
Recovered with Sequela[recovered, with a lasting effect]0.5%24, All reports: 2.3%
Ongoing11%550, All reports: 17.4%
Died7.6%378, All reports: 4.9%
Euthanized0.4%21, All reports: 1.5%
Outcome Unknown58%2,891, All reports: 22.7%

An outcome in a report is not proof that the drug caused it. The person who sends the report gives the outcome. Each share is of the 4,984 reports that list this sign.

Age of the animal

Reports with this sign
All reports

Under 1 year22.7%1,132, All reports: 9.5%
1 to 3 years26.9%1,343, All reports: 23.9%
4 to 7 years21%1,049, All reports: 20.2%
8 to 11 years13.4%669, All reports: 15.4%
12 years and over3.5%175, All reports: 10.7%
Age not given12.4%616, All reports: 20.3%

The outcome is for the full report, not for this sign only.

Next in the A to Z list of signs

Lack of efficacy (heartworm)[the product did not have the expected effect: heartworm]
Lack of efficacy (lice)[the product did not have the expected effect: lice]
Lack of efficacy (neoplasia, no remission)[the product did not have the expected effect: neoplasia, no remission]
Lack of efficacy (protozoa)[the product did not have the expected effect: protozoa]
Lack of efficacy (protozoa) - Ehrlichia[the product did not have the expected effect: Ehrlichia bacteria]
Lack of efficacy (protozoa) - Giardia[the product did not have the expected effect: Giardia]
Lack of efficacy (protozoa) - NOS[the product did not have the expected effect: target not specified]
Lack of efficacy (roundworm)[the product did not have the expected effect: roundworms]

All clinical signs

Cite this page

Pet Drug Reports. Lack of efficacy (protozoa) - Coccidia: adverse event reports for animal drugs. https://petdrugreports.com/reaction/lack-of-efficacy-protozoa-coccidia/ Source: FDA Center for Veterinary Medicine, openFDA Animal and Veterinary adverse event reports, export of 30 Oct 2026. Reports received through 26 Jun 2026.

Where the data come from

The counts come from the openFDA Animal and Veterinary adverse event files, export of 30 Oct 2026. The files have the reports that the FDA Center for Veterinary Medicine received through 26 Jun 2026. The files mask brand and manufacturer names. The site counts a drug by the active ingredients that each record gives, and gives no count to a brand, an application or a company. Ingredient names and the lists of approved products follow the FDA Green Book of 2 Nov 2026. The site counts the different spellings of one VeDDRA term together.

The site does not publish report text, lot numbers or details of a reporter. FDA's record is the authority. See how the site counts reports, the data sources and the corrections page.

Questions about this sign

What does this term mean in a report?: In plain words: the product did not have the expected effect: coccidia. It is a term from VeDDRA, the list of terms that FDA and drug companies use to code a report. The person who coded the report selected the term.
How does the count of the latest 12 months compare with the 12 months before?: FDA received 177 reports in the 12 months to June 2026. It received 168 reports in the 12 months before. FDA says that a report can take 3 to 6 months to reach the public data. The newest months can get more reports in a later update.
How many of these reports have a serious flag?: Of the 3,785 reports that say if the event was serious, 52.3% have the serious flag. The person who sends a report sets the flag.
Does a drug in the table cause this sign?: The reports do not show that. A report can name more than one drug. FDA states this about the data.
When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event.
The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources.
FDA Center for Veterinary Medicine. Source: Adverse Event Reports for Animal Drugs and Devices