GC-MS TENTATIVE DETECTION AND CHARACTERIZATION OF HYDROXYTRAMADOL AS A METABOLITE OF TRAMADOL IN MAN. International Research Journal of Pharmacy, [S. l.], v. 5, n. 10, p. 43–45, 2024. Disponível em: https://irjponline.org/index.php/irjp/article/view/1381. Acesso em: 27 aug. 2026.