Phenylbutazone, often referred to as “bute”,[1] is a nonsteroidal anti-inflammatory drug (NSAID) for the short-term treatment of pain and fever in animals.

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| 4-butyl-1,2-diphenyl-pyrazolidine-3,5-dione |
| Trade names | Butazolidine |
| Legal status | ℞ (Prescription only) |
| CAS Number | 50-33-9 |
| ATC code | M01AA01 M02AA01 |
| PubChem | CID: 4781 |
| IUPHAR/BPS | 7270 |
| DrugBank | DB00812 |
| ChemSpider | 4617 |
| UNII | GN5P7K3T8S |
| KEGG | D00510 |
| ChEBI | CHEBI:48574 |
| ChEMBL | CHEMBL101 |
| Formula | C19H20N2O2 |
| Molecular mass | 308.374 g/mol |
| SMILES[show] | |
| InChI[show] | |