Tramadol Safer and Effective Analgesic to Treat Chronic Pain: A Review. International Journal of Biomedical and Advance Research, [S. l.], v. 3, n. 1, p. 07–16, 2012. DOI: 10.7439/ijbar.v3i1.270. Disponível em: https://ssjournals.co.in/index.php/ijbar/article/view/103. Acesso em: 14 mar. 2026.