Indomethacin is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase enzymes, leading to decreased synthesis of prostaglandins, which are mediators of inflammation and pain. It is clinically significant for its effectiveness in treating conditions such as rheumatoid arthritis, osteoarthritis, and acute gout attacks. A key association is its potential to cause gastrointestinal complications, including ulcers and bleeding, necessitating careful monitoring during long-term use.