Butazolidin, commonly known as phenylbutazone, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammation in animals. Common synonyms for butazolidin include horse aspirin, bute, and PBZ. Bute was once a common medication for horses, but it is no longer approved for use in food animals due to human health concerns. Other synonyms for butazolidin include butacarb, butapyrin, phenylbutazone sodium, and sulfinpyrazone. These synonyms refer to variations of butazolidin or drugs with similar applications. It is important to note that the use of butazolidin has been questioned due to potential risks to both animal and human health.