Pyrazolidindiones

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

Sulfinpyrazone is a uricosuric medication used to treat gout. It also sometimes is used to reduce platelet aggregation by inhibiting degranulation of platelets which reduces the release of ADP and thromboxane.

Oxyphenbutazone is a nonsteroidal anti-inflammatory drug (NSAID). It is a metabolite of phenylbutazone.

Feprazone (or prenazone) is a drug used for joint and muscular pain.

Mofebutazone (or monophenylbutazone) is a drug used for joint and muscular pain. It is a 3,5-pyrazolinedione derivative.

Kebuzone (or ketophenylbutazone) is a nonsteroidal anti-inflammatory drug (NSAID) that is used for the treatment of inflammatory conditions such as thrombophlebitis and rheumatoid arthritis (RA).

Suxibuzone is an analgesic used for joint and muscular pain. It is a prodrug of the non-steroidal anti-inflammatory drug (NSAID) phenylbutazone, and is commonly used in horses.