Sulfamethazine (Sulmet, Sustain III): adverse event reports that FDA received

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 110 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.

1. Vials, Leaking[a product quality report, not a sign in an animal]18.2%20 reports
2. Death16.4%18 reports
3. Containers, Damaged[a product quality report, not a sign in an animal]10%11 reports
4. Caps, Abnormal[a product quality report, not a sign in an animal]9.1%10 reports
5. Seal, Abnormal[a product quality report, not a sign in an animal]6.4%7 reports
6. Color, Abnormal[a product quality report, not a sign in an animal]5.5%6 reports
7. Containers, Abnormal[a product quality report, not a sign in an animal]4.5%5 reports
8. Physical label missing4.5%5 reports
9. Tablets, Abnormal[a product quality report, not a sign in an animal]4.5%5 reports
10. Solution, Abnormal[a product quality report, not a sign in an animal]3.6%4 reports
11. Bolus, Abnormal2.7%3 reports
12. Diarrhoea[diarrhea]2.7%3 reports
13. Granules/Powder, Abnormal2.7%3 reports
14. Ataxia[unsteady, uncoordinated movement]1.8%2 reports

The list shows 30 of 59 coded signs. A report is not proof that a drug caused a sign. Download all signs (CSV)

Reports by species

• Cattle12.7%14
• Chicken6.4%7
• Other Birds3.6%4
• Dog1.8%2
• Goat0.9%1
• Human exposure0.9%1

The share is of all 110 reports that name sulfamethazine. The other reports give a different species or no species.

Reports for each month, Jul 2021 to Jun 2026

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

2024 has the reports that FDA received through Oct 2024. Download the years (CSV)

What the reports record

Each bar is on a scale of 0 to 100%.

Other pages with this ingredient

A report names a drug by its set of active ingredients. Each set has its own page. The list is in order of name.

• Sulfamethazine, all combinations

Next in the A to Z list

• Stanozolol
• Sucralfate
• Sulfadiazine + Trimethoprim
• Sulfadimethoxine
• Telmisartan
• Tepoxalin
• Terbinafine
• Tetracaine

All drugs by active ingredient. Brand names A to Z

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 006-084The FDA record of the application for Sulmet Drinking Water Solution, 12.5%.
• Green Book record of NADA 008-774The FDA record of the application for Sulmet Solution Injectable.
• Green Book record of NADA 049-892The FDA record of the application for Sulfamethazine Spanbolet II.
• Green Book record of NADA 120-615The FDA record of the application for Sustain III Bolus, Sustain III Calf Bolus.
• Green Book record of NADA 122-271The FDA record of the application for Sulmet Oblets.
• Green Book record of NADA 126-232The FDA record of the application for Calfspan.
• Animal Drugs @ FDAThe search page of the Green Book, the FDA list of approved animal drugs.

The site checked these addresses on 2 Oct 2026. The links open in a new tab.

Cite this page

Pet Drug Reports. Sulfamethazine: adverse event reports that FDA received. https://petdrugreports.com/drug/sulfamethazine/ 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

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 no reports in the 12 months to June 2026. It received 1 report 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 110 reports received from February 1987 to October 2024, 26.4% are about a safety issue only. 0.9% are about a lack of expected effectiveness, alone or with a safety issue. 72.7% are about a defect of the product or its package.