Nitenpyram (Capstar): adverse event reports that FDA received
Active ingredient
The name in brackets is a brand name with this active ingredient.
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.
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 FDAFrom February 2001 to June 2026, FDA received 21,578 adverse event reports that name a drug with nitenpyram as its active ingredient. Of the 21,578 reports, 10,784 (50%) are about dogs. 8,753 reports are about cats (40.6%).
In January to March 2026, FDA received 120 reports that name this drug. The signs that appear in the largest number of the 21,578 reports are "Lack of efficacy (ectoparasite) - flea", "Hyperactivity" and "Panting". A report is not proof that a drug caused a sign.
Reports that name this drug fell by 20.6% 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 cats are 40.6% of the reports that name this drug, and 11% of all reports.
Since the last update of the FDA data
The site recorded an update of the FDA data on . FDA changed these counts for January to March 2026:
- All species: from 83 to 120.
- Dog: from 42 to 52.
- Cat: from 36 to 48.
- Other species or species not given: from 5 to 20.
January to March 2026 is the latest closed quarter in the data. In that quarter FDA received 120 reports that name nitenpyram: 52 dog, 48 cat, 0 horse, 20 other or not given.
Signs that the reports list
A sign is a coded term from the report. The words in brackets are a plain gloss of the term. The percentage is the share of the 21,578 reports that list the sign. One report can list more than one sign.
The sign that is in the largest number of the reports comes first.
- Lack of efficacy (ectoparasite) - flea[the product did not have the expected effect: fleas]31.3%6,744 reports
- Hyperactivity11.9%2,558 reports
- Panting9.8%2,113 reports
- Lack of efficacy (flea)[the product did not have the expected effect: fleas]8.2%1,767 reports
- Lethargy[unusually tired or inactive]7.2%1,557 reports
- Vomiting6.9%1,483 reports
- Vocalisation[crying out or unusual noise]6.8%1,474 reports
- Scratching5.5%1,195 reports
- Agitation5.2%1,114 reports
- Pruritus[itching]4.8%1,045 reports
- Lack of efficacy - NOS[the product did not have the expected effect]4%872 reports
- Diarrhoea[diarrhea]3.7%792 reports
- Itching3.6%781 reports
- Behavioural disorder NOS[behaviour change, type not specified]3.4%743 reports
Show the next 16 signs
- Product label issues[a product quality report, not a sign in an animal]3.4%739 reports
- Product problem[a product quality report, not a sign in an animal]3.2%689 reports
- Anorexia[not eating]2.9%625 reports
- Depression[dull, quiet or withdrawn]2.7%576 reports
- Underfilling, Package[a product quality report, not a sign in an animal]2.4%525 reports
- Death2.4%514 reports
- Overdose[more than the labelled amount was given]2%441 reports
- Polypnoea[fast breathing]2%427 reports
- Not eating1.9%405 reports
- Seizure NOS[seizure, type not specified]1.8%388 reports
- Excessive licking and/or grooming1.7%368 reports
- Ataxia[unsteady, uncoordinated movement]1.5%323 reports
- Hiding1.4%295 reports
- Unpalatable[legacy FDA term: the animal would not take it]1.3%287 reports
- Fever1.3%284 reports
- Decreased appetite1.3%281 reports
The list shows 30 of 1,358 coded signs. A report is not proof that a drug caused a sign. Download all signs (CSV)
Reports by species
The share is of all 21,578 reports that name nitenpyram. The other reports give a different species or no species.
Reports for each month, Jul 2021 to Jun 2026
No chart: no month has 5 or more reports.
The month is the month in which FDA received the report. Each chart has its own scale. 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 by year
- Dog
- Cat
- Horse
- Other or not given
| Year | Dog | Cat | Horse | Other or not given | All species |
|---|---|---|---|---|---|
| 2026 | 180 | 132 | 0 | 28 | 340 |
| 2025 | 469 | 439 | 0 | 101 | 1,009 |
| 2024 | 859 | 718 | 0 | 139 | 1,716 |
| 2023 | 723 | 615 | 0 | 79 | 1,417 |
| 2022 | 598 | 534 | 0 | 47 | 1,179 |
| 2021 | 550 | 510 | 0 | 35 | 1,095 |
| 2020 | 584 | 444 | 0 | 156 | 1,184 |
| 2019 | 634 | 507 | 0 | 242 | 1,383 |
| 2018 | 757 | 546 | 0 | 208 | 1,511 |
| 2017 | 1,112 | 798 | 0 | 268 | 2,178 |
| 2016 | 1,077 | 738 | 0 | 216 | 2,031 |
| 2015 | 775 | 495 | 0 | 89 | 1,359 |
| 2014 | 561 | 308 | 0 | 160 | 1,029 |
| 2013 | 281 | 269 | 0 | 33 | 583 |
| 2012 | 291 | 263 | 0 | 43 | 597 |
| 2011 | 217 | 219 | 0 | 31 | 467 |
| 2010 | 126 | 150 | 0 | 39 | 315 |
| 2009 | 153 | 172 | 0 | 20 | 345 |
| 2008 | 169 | 174 | 0 | 33 | 376 |
| 2007 | 166 | 170 | 0 | 15 | 351 |
| 2006 | 138 | 148 | 0 | 17 | 303 |
| 2005 | 154 | 166 | 0 | 14 | 334 |
| 2004 | 137 | 134 | 0 | 14 | 285 |
| 2003 | 37 | 71 | 0 | 5 | 113 |
| 2002 | 18 | 15 | 0 | 5 | 38 |
| 2001 | 18 | 18 | 0 | 4 | 40 |
2026 has the reports that FDA received through Jun 2026. Download the years (CSV)
What the reports record
Outcome at the time of the report
- Recovered/Normal16%3,462
- Recovered with Sequela[recovered, with a lasting effect]0.2%47
- Ongoing14.5%3,133
- Died3%654
- Euthanized0.7%148
- Outcome Unknown45.4%9,795
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 21,578 reports that name nitenpyram.
A report about more than one animal can have more than one outcome.
Kind of report
- Safety issue52.8%11,388
- Lack of expected effectiveness17.7%3,825
- Both safety and lack of expected effectiveness16.2%3,486
- Manufacturing or product defect13.3%2,868
- Other0.1%11
16,987 reports say if the event was serious. 12.2% of them have the serious flag. The person who sends the report sets the flag.
Show age, weight, breed and route
Age of the animal
- Under 1 year12.5%2,694
- 1 to 3 years24.7%5,320
- 4 to 7 years20.2%4,367
- 8 to 11 years12.4%2,679
- 12 years and over9.2%1,985
- Age not given21%4,533
Weight of the animal
- Under 5 kg (11 lb)34.6%7,463
- 5 to 9.9 kg (11 to 22 lb)21.9%4,729
- 10 to 24.9 kg (22 to 55 lb)12.3%2,655
- 25 to 44.9 kg (55 to 99 lb)7.8%1,686
- 45 kg and over (99 lb and over)1.8%384
- Weight not given21.6%4,661
Breed, where the report gives one breed
- Domestic Shorthair16%3,449
- Domestic6%1,301
- Domestic Longhair4.8%1,031
- Chihuahua3.8%830
- Domestic Mediumhair2.3%486
- Yorkshire Terrier2%429
- Shih Tzu1.7%358
- Labrador Retriever1.6%354
A breed with many animals has many reports.
Route in the report
- Oral87.8%18,939
- Topical0.2%40
- Rectal0.1%30
- Other0.1%14
- Cutaneousunder 0.1%5
- Transplacentalunder 0.1%5
Each bar is on a scale of 0 to 100%.
Approved animal drugs with this active ingredient (FDA Green Book)
This section is reference data. It has no report count.
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.
Brand names
- Capstar
What the Green Book records give
- Applications with an approval in force
- 2
- Approved species
- Cats, Dogs
- Dose forms
- Tablet
- Routes
- Oral
- Sale
- OTC (over the counter)
- Earliest approval date in the records
The species, dose forms and routes are the words of the Green Book records for all the applications together. One product can have fewer. The label of a product gives its approved use.
| Brand name | Active ingredients | Sponsor | Approved species | Application |
|---|---|---|---|---|
| Capstar | Nitenpyram | Sergeant’s Pet Care Products LLC | Dogs, Cats | NADA 141-175 |
| Nitenpyram Tablets | Nitenpyram | Felix Pharmaceuticals Pvt. Ltd. | Dogs, Cats | ANADA 200-858 |
Next in the A to Z list
FDA pages for this drug
- How to Report Animal Drug and Device Side Effects and Product ProblemsThe FDA page that tells an owner or a veterinarian how to send a report.
- Green Book record of NADA 141-175The FDA record of the application for Capstar.
- Green Book record of ANADA 200-858The FDA record of the application for Nitenpyram Tablets.
- Animal Drugs @ FDAThe search page of the Green Book, the FDA list of approved animal drugs.
The site checked these addresses on . The links open in a new tab.
Cite this page
Pet Drug Reports. Nitenpyram: adverse event reports that FDA received. https://petdrugreports.com/drug/nitenpyram/ 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 does not use the application number that a record has.
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 these reports
- Which brand are these reports about?
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. The Green Book section of this page lists the brand names with this active ingredient.
- Do the reports show that the drug caused the signs?
No. 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
- How many reports did FDA receive in the latest 12 months?
FDA received 1,041 reports in the 12 months to June 2026. It received 1,311 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.
- What kinds of report are in the count?
Of the 21,578 reports received from February 2001 to June 2026, 52.8% are about a safety issue only. 33.9% are about a lack of expected effectiveness, alone or with a safety issue. 13.3% are about a defect of the product or its package.