Repurposed Systemic Pharmacologic Agents in Chronic Pain: Emerging Mechanistic and Clinical Insights. - McKenzie, Alyssa; Dombrower, Rachel; Bittar, Tiffany G.; McKenzie, Sophia M.; Theeraphapphong, Nitchanan; Shukla, Neil; Hussain, Hatim; Abd-Elsayed, Alaa (Journal of Clinical Medicine, 2026)