Pet Drug Reports

Ineffective, ascarids NOSin adverse event reports for animal drugs

Clinical sign, a term of older FDA reports

In plain words: the product did not have the expected effect (ascarids nos).

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 . The data have the reports that FDA received through .

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

Contacting a veterinarianHow to report to FDA

From February 1987 to September 2022, FDA received 19,031 adverse event reports for animal drugs that list this sign. That is 1.4% of the 1,378,761 reports that FDA received from January 1987 to June 2026. In the 12 months to June 2026, FDA received no reports that list this sign.

Of the 19,031 reports, 95.8% 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 28 of 1,149 clinical signs with a page. Fewer than 20 reports listed this sign in the 12 months before June 2026, so this page gives no change. Reports about dogs are 95.8% of the reports that list this sign, and 72.6% 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 20 drug pages.

Drug pages with 20 or more reports that list this sign, in order of name
Active ingredientsReports that list the sign
Carprofen20
Emodepside + Praziquantel22
Febantel + Praziquantel + Pyrantel Pamoate28
Fenbendazole46
Imidacloprid + Moxidectin127
Ivermectin105
Ivermectin + Praziquantel33
Ivermectin + Praziquantel + Pyrantel Pamoate495
Ivermectin + Pyrantel Pamoate11,261
Lufenuron + Milbemycin Oxime1,713
Lufenuron + Praziquantel292
Milbemycin Oxime2,162
Milbemycin Oxime + Praziquantel34
Milbemycin Oxime + Spinosad1,354
Moxidectin64
Oxibendazole36
Praziquantel + Pyrantel Pamoate29
Pyrantel Pamoate183
Pyrantel Tartrate29
Selamectin1,109

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 15 ingredients.

Reports by species

The share is of the 19,031 reports that list this sign. The sign is in 1.8% of all reports about the species dog. The sign is in 0.4% of all reports about the species cat.

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. New reports use VeDDRA terms, so a term of older reports has few reports in the latest years.

Reports that list Ineffective, ascarids NOS, by the year in which FDA received them
YearReports
20224
20211
20201
201811
20171,481
20161,969
20152,046
20141,879
20131,880
20121,759
20111,367
20101,310
20091,331
20081,248
20071,117
2006660
2005342
2004231
2003141
200249
200150
200062
199921
199822
19979
19965
19956
19945
19935
19924
19913
19905
19884
19873

What these reports record

Outcome at the time of the report

  • Reports with this sign
  • All reports
  • Recovered/Normal4.4%840
  • Recovered with Sequela[recovered, with a lasting effect]0.4%75
  • Ongoing5%944
  • Died0.5%103
  • Euthanized0.1%11
  • Outcome Unknown48%9,141

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 19,031 reports that list this sign.

Age of the animal

  • Reports with this sign
  • All reports
  • Under 1 year14.9%2,831
  • 1 to 3 years31.8%6,050
  • 4 to 7 years25.6%4,868
  • 8 to 11 years17.4%3,307
  • 12 years and over5.1%966
  • Age not given5.3%1,009

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

Next in the A to Z list of signs

All clinical signs

Cite this page

Pet Drug Reports. Ineffective, ascarids NOS: adverse event reports for animal drugs. https://petdrugreports.com/reaction/ineffective-ascarids-nos/ Source: FDA Center for Veterinary Medicine, openFDA Animal and Veterinary adverse event reports, export of . Reports received through .

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 (ascarids nos). It is a term from older FDA reports, from before FDA used the VeDDRA list. 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 no reports in the 12 months to June 2026. It received no 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 10,982 reports that say if the event was serious, 58.5% 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