Ingredients

Ingredient sets that include chlortetracycline

Ordered by report count. FDA states that these data "cannot be used to estimate the risk associated with the product or compare one drug or device product with another"; counts follow sales volume and years on the market. A report can list more than one set, so shares can add to more than 100%.

Signs listed in reports, pooled

share of chlortetracycline reports listing the termall reports in the database

1. Death33.6%49
2. Lack of efficacy (bacteria) - NOS[the product did not have the expected effect: target not specified]13%19
3. Lack of efficacy - NOS[the product did not have the expected effect]7.5%11
4. NT - Abnormal necropsy finding NOS[NOS: not otherwise specified]6.8%10
5. Lameness6.2%9
6. No sign[no clinical sign was reported]6.2%9
7. Color, Abnormal[a product quality report, not a sign in an animal]4.8%7
8. Accidental exposure[exposure that was not intended]4.1%6
9. Anorexia[not eating]4.1%6
10. Granules/Powder, Abnormal4.1%6
11. Lack of efficacy (protozoa) - Coccidia[the product did not have the expected effect: coccidia]4.1%6
12. Necropsy performed4.1%6
13. Pneumonia[lung infection or inflammation]4.1%6
14. Potency, Low4.1%6
15. Vocalisation[crying out or unusual noise]4.1%6
16. Weight loss4.1%6
17. Cough3.4%5
18. Lethargy[unusually tired or inactive]3.4%5
19. Other abnormal test result NOS[abnormal laboratory result, type not specified]3.4%5
20. Abnormal test result2.7%4
21. Cardiac disorder NOS[heart problem, type not specified]2.7%4
22. Death by euthanasia[the animal was euthanized]2.7%4
23. Increased mortality rate2.7%4
24. Lateral recumbency[lying on the side, unable to rise]2.7%4
25. Residues in milk2.7%4
26. Ruminal bloat2.7%4
27. Bronchopneumonia2.1%3
28. Contamination, Mold2.1%3
29. Diarrhoea[diarrhea]2.1%3
30. Found dead2.1%3

Pooled across every ingredient set and every report that names the ingredient. One report can list several terms and several drugs; a term here may relate to any of them or to none.

Monthly reports by species, five years

By month of receipt; each panel has its own scale. The newest months are incomplete because FDA posts reports with a delay of three to six months.

Outcomes, report types and ages

Coloured bar: reports naming chlortetracycline. Grey bar: all 1,357,245 reports. Outcomes are as stated by the reporter; FDA has not necessarily determined whether any product played a part.

In context

Shares of reports, not of animals treated: how many animals receive the ingredient is not public. Ingredients used in anaesthesia, cancer care or in old animals carry more serious outcomes in their reports for that reason alone.

Where this comes from. Counts are built from the openFDA Animal & Veterinary adverse event bulk files released 28 Sep 2026, which hold reports FDA's Center for Veterinary Medicine received through 31 Mar 2026. openFDA masks brand and manufacturer names in these files, so drugs are counted by the active ingredients each record discloses and no figure is attributed to a brand, application or company. Ingredient names, and the separate reference lists of approved products, follow the FDA Green Book as of 1 Oct 2026. Ingredient names follow the Green Book; salts and forms are kept as FDA lists them. Drug entries are matched by the active ingredients their unmasked ingredient field discloses. No report text, lot numbers or reporter details are published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.