Phenylbutazone. Butacote . Butadion . Butadione . Butapirazol . Butapyrazole . Butazolidin . Diphenylbutazone . Fenilbutazon . A butyl-diphenyl-pyrazolidinedione that has anti-inflammatory, antipyretic, and analgesic activities. It has been used in ANKYLOSING SPONDYLITIS; RHEUMATOID ARTHRITIS; and REACTIVE ARTHRITIS. . 1.00