Chapter 30: Drugs for Pain, Inflammation, and Arthritic Disorders

Drugs for Pain, Inflammation, and Arthritic Disorders overview examines the pharmacological strategies used to manage pain, inflammation, and common arthritic disorders, specifically focusing on the roles of nonsteroidal anti-inflammatory drugs (NSAIDs), disease-modifying antirheumatic drugs (DMARDs), and specialized antigout medications. The text distinguishes between the autoimmune-driven joint destruction seen in rheumatoid arthritis and the wear-and-tear degeneration characteristic of osteoarthritis, while also addressing the metabolic origins of gout. The primary mechanism of NSAID therapy is the inhibition of cyclooxygenase enzymes, which reduces the production of prostaglandins responsible for pain, fever, and the inflammatory response. Clinical distinctions are made between nonselective agents like ibuprofen or naproxen and selective COX-2 inhibitors such as celecoxib, which aim to minimize gastric irritation. Aspirin is noted for its unique ability to irreversibly inhibit platelet aggregation, whereas acetaminophen provides relief for pain and fever without significant anti-inflammatory effects. For patients with progressive rheumatoid arthritis, DMARDs like methotrexate serve as the cornerstone of treatment to slow disease progression. The chapter further details the advent of advanced biologic therapies, including tumor necrosis factor (TNF) alpha blockers and various interleukin inhibitors that target specific immune pathways. Finally, the management of gout is explored through two lenses: acute relief using colchicine or potent NSAIDs like indomethacin, and long-term prevention through the use of xanthine oxidase inhibitors like allopurinol or uricosuric agents like probenecid to lower systemic uric acid levels.