| Sulfanitran | Organic compounds | Benzenoids | Benzene and substituted derivatives | Sulfanilides | Details |
| Sulfaquinoxaline | Organic compounds | Organoheterocyclic compounds | Diazanaphthalenes | Benzodiazines | Details |
| Tepoxalin | Organic compounds | Organoheterocyclic compounds | Azoles | Pyrazoles | Details |
| Thiostrepton | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Tiamulin | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Diterpenoids | Details |
| Tildipirosin | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Tilmicosin | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Tioxidazole | Organic compounds | Organoheterocyclic compounds | Benzothiazoles | Not Available | Details |
| Metrifonate | Organic compounds | Organic acids and derivatives | Organic phosphonic acids and derivatives | Phosphonic acid diesters | Details |
| Tulathromycin A | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Tylosin | Organic compounds | Organic oxygen compounds | Organooxygen compounds | Carbohydrates and carbohydrate conjugates | Details |
| Xylazine | Organic compounds | Benzenoids | Benzene and substituted derivatives | Xylenes | Details |
| Zeranol | Organic compounds | Phenylpropanoids and polyketides | Macrolides and analogues | Not Available | Details |
| Zilpaterol | Organic compounds | Organoheterocyclic compounds | Benzazepines | Not Available | Details |
| Zoalene | Organic compounds | Benzenoids | Benzene and substituted derivatives | Toluenes | Details |
| Atipamezole | Organic compounds | Benzenoids | Indanes | Not Available | Details |
| Ceftiofur | Organic compounds | Organoheterocyclic compounds | Lactams | Beta lactams | Details |
| Dexamethasone isonicotinate | Organic compounds | Lipids and lipid-like molecules | Steroids and steroid derivatives | Pregnane steroids | Details |
| Nalorphine | Organic compounds | Alkaloids and derivatives | Morphinans | Not Available | Details |
| Sarafloxacin | Organic compounds | Organoheterocyclic compounds | Quinolines and derivatives | Phenylquinolines | Details |
| Sodium tripolyphosphate | Inorganic compounds | Mixed metal/non-metal compounds | Alkali metal oxoanionic compounds | Alkali metal phosphates | Details |
| (S)-methoprene | Organic compounds | Lipids and lipid-like molecules | Prenol lipids | Sesquiterpenoids | Details |
| 2-mercaptobenzothiazole | Organic compounds | Organoheterocyclic compounds | Benzothiazoles | Not Available | Details |
| Sulfotep | Organic compounds | Organic acids and derivatives | Organic thiophosphoric acids and derivatives | Thiophosphoric acid esters | Details |
| Bunamidine | Organic compounds | Benzenoids | Naphthalenes | Not Available | Details |
| Butacaine | Organic compounds | Benzenoids | Benzene and substituted derivatives | Benzoic acids and derivatives | Details |
| Caramiphen | Organic compounds | Benzenoids | Benzene and substituted derivatives | Not Available | Details |
| Cloprostenol | Organic compounds | Lipids and lipid-like molecules | Fatty Acyls | Eicosanoids | Details |
| Cupric glycinate | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |
| Deslorelin | Organic compounds | Organic acids and derivatives | Carboxylic acids and derivatives | Amino acids, peptides, and analogues | Details |