Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass)
10 adverse event reports submitted to the FDA
Active Ingredients
Administration Routes
Species Affected
Most Affected Breeds
Most Reported Reactions
Outcome Breakdown
Data Summary
| Metric | Value |
|---|---|
| Total adverse event reports | 10 |
| Reports involving death | 3 |
| Case-fatality rate (reported events) | 3000.0% |
| Distinct species in reports | 3 |
| Distinct breeds in reports | 6 |
| Distinct reactions reported | 17 |
| Active ingredients on file | 1 |
Source: FDA Center for Veterinary Medicine — Adverse Event Reporting (CVM AER). Counts reflect voluntary reports only.
Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass) Adverse Event Insights
The FDA Center for Veterinary Medicine database currently holds 10 adverse event reports referencing Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass), including 3 reports in which the animal died — a 3000.0% case-fatality figure among reported events only, not a population-level mortality rate. Active ingredient on file: Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass). Reported administration routes include Oral, Unknown. These numbers reflect voluntary submissions from pet owners, veterinarians, and manufacturers and therefore under-represent mild events and over-represent severe ones — a pattern the FDA has documented repeatedly for pharmacovigilance datasets.
The species most frequently named in Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass) reports are Cattle (8 reports), Horse (1 reports), Unknown (1 reports), with Cattle accounting for the largest share. Within those species, Holstein-Friesian also known as Holstein (3), Cattle (other) (3), Jersey (1) appear most often — though breed popularity and ownership density shape these counts as much as any drug-specific sensitivity. This distribution matters because the same active ingredient can behave very differently across body sizes, ages, and species physiology.
The most commonly reported clinical signs associated with Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass) are No sign (4), Lack of efficacy (bacteria) - NOS (2), Increased mortality rate (1), Death by euthanasia (1). Of the 13 reports with a coded outcome, Outcome Unknown is the leading category at 53.8%. Because FDA adverse event data describes correlation rather than causation, these figures are best used to frame informed questions with a veterinarian and to compare reporting patterns across related products — not as a standalone safety verdict on Sulfamethazine; Chlortetracycline As Calcium Complex (Biomass).
Source: FDA Center for Veterinary Medicine — Adverse Event Reports FDA Center for Veterinary Medicine — Adverse Event Reports Data reflects voluntary submissions and may not represent actual incidence rates
Read our methodology — how this data is sourced, computed, and verified.