Used as an active pharmaceutical ingredient in nonsteroidal anti-inflammatory drugs (NSAIDs), particularly in the treatment of pain, inflammation, and fever. It is a key metabolite of ibuprofen and contributes to the overall therapeutic effect by inhibiting cyclooxygenase (COX) enzymes, which play a role in prostaglandin synthesis. Due to its anti-inflammatory properties, it is formulated in oral and topical preparations for managing conditions like arthritis, minor injuries, and musculoskeletal pain. Its presence in metabolic pathways also makes it relevant in pharmacokinetic studies of ibuprofen metabolism.