A nonsteroidal benzeneacetic acid derivative with anti-inflammatory activity. As a nonsteroidal anti-inflammatory drug (NSAID), diclofenac binds and chelates both isoforms of cyclooxygenase (COX-1 and-2), thereby blocking the conversion of arachidonic acid to pro-inflammatory-proprostaglandins. This agent also may inhibit COX-2-mediated tumor angiogenesis. When inhibiting COX-2, diclofenac may be effective in relieving pain and inflammation; when inhibiting COX-1, it may produce unacceptable gastrointestinal side effects. This agent may be more active against COX-2 than several other carboxylic acid-containing NSAIDs. [url:http://purl.obolibrary.org/obo/NCIT_C28985]